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Why is my 1985 s 10 2.8 engine so hard to start ?
Ok,i have been searching for an answer to why my truck is so hard to start. I have done everything i know to fix this but no luck yet . I have put a re-manufactured carburetor on it.I have checked all the vacuum lines,replaced the fuel pump. manual pump. I have a clear fuel filter that look good. I have done a tune up,plugs,wires,cap,pickup module,exc... I have even done a compression test that passes easily. The engine runs good, its just hard to start. Im stumped !
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Why is my 1985 s 10 2.8 engine so hard to start ?
> wrote:
>Ok,i have been searching for an answer to why my truck is so hard to start.= > I have done everything i know to fix this but no luck yet . I have put a r= >e-manufactured carburetor on it.I have checked all the vacuum lines,replace= >d the fuel pump. manual pump. I have a clear fuel filter that look good. I = >have done a tune up,plugs,wires,cap,pickup module,exc... I have even done a= > compression test that passes easily. The engine runs good, its just hard t= >o start. Im stumped ! Fuel, air, spark, timing, and exhaust. Is the mixture good? Is the choke closing down for starting and then opening up once the engine warms up a bit? Look at the butterfly and mark where it sits with a sharpie. If you block it partially with your hand or with masking tape, will the engine start properly? The fuel mixture needs to be extra rich for starting. The automatic choke sets it that way, if it's working, which it often doesn't. If you put the timing light on it while it's running properly, do the marks line up? And then when you put the light on when you're trying to start it, is the timing retarded or do the marks still line up? The timing should shift severely back for starting and then the vacuum advance move the timing up once the engine catches. Make sure it's moving the timing, don't spend your time dicking with the vacuum system unless you verify that it isn't. Is there a good hot spark when you pull a plug out and watch it? An awful lot of "carb problems" turn out to be ignition problems. If you disconnect the exhaust system, will it start right up? A partial exhaust blockage may produce high back pressure at starting, but then the blockage may be forced out of the way once the engine starts running. Don't just replace things, check them out one at a time. Think about what is different between starting and running... and three big things are the choke position, the timing advance position, and the exhaust pressure... --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Saturday, October 7, 2017 at 6:42:33 PM UTC-5, Scott Dorsey wrote:
> > wrote: > >Ok,i have been searching for an answer to why my truck is so hard to start.= > > I have done everything i know to fix this but no luck yet . I have put a r= > >e-manufactured carburetor on it.I have checked all the vacuum lines,replace= > >d the fuel pump. manual pump. I have a clear fuel filter that look good. I = > >have done a tune up,plugs,wires,cap,pickup module,exc... I have even done a= > > compression test that passes easily. The engine runs good, its just hard t= > >o start. Im stumped ! > > Fuel, air, spark, timing, and exhaust. > > Is the mixture good? Is the choke closing down for starting and then opening > up once the engine warms up a bit? Look at the butterfly and mark where it > sits with a sharpie. If you block it partially with your hand or with masking > tape, will the engine start properly? The fuel mixture needs to be extra rich > for starting. The automatic choke sets it that way, if it's working, which > it often doesn't. > > If you put the timing light on it while it's running properly, do the marks > line up? And then when you put the light on when you're trying to start it, > is the timing retarded or do the marks still line up? The timing should > shift severely back for starting and then the vacuum advance move the timing > up once the engine catches. Make sure it's moving the timing, don't spend > your time dicking with the vacuum system unless you verify that it isn't. > > Is there a good hot spark when you pull a plug out and watch it? An awful > lot of "carb problems" turn out to be ignition problems. > > If you disconnect the exhaust system, will it start right up? A partial > exhaust blockage may produce high back pressure at starting, but then the > blockage may be forced out of the way once the engine starts running. > > Don't just replace things, check them out one at a time. Think about what > is different between starting and running... and three big things are the > choke position, the timing advance position, and the exhaust pressure... > --scott > > -- > "C'est un Nagra. C'est suisse, et tres, tres precis." Thanks Scott, i have done all you have suggested. I am somewhat mechanically inclined,i fix all my own issues, but this has me stumped ! |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Saturday, October 7, 2017 at 6:42:33 PM UTC-5, Scott Dorsey wrote:
> > wrote: > >Ok,i have been searching for an answer to why my truck is so hard to start.= > > I have done everything i know to fix this but no luck yet . I have put a r= > >e-manufactured carburetor on it.I have checked all the vacuum lines,replace= > >d the fuel pump. manual pump. I have a clear fuel filter that look good. I = > >have done a tune up,plugs,wires,cap,pickup module,exc... I have even done a= > > compression test that passes easily. The engine runs good, its just hard t= > >o start. Im stumped ! > > Fuel, air, spark, timing, and exhaust. > > Is the mixture good? Is the choke closing down for starting and then opening > up once the engine warms up a bit? Look at the butterfly and mark where it > sits with a sharpie. If you block it partially with your hand or with masking > tape, will the engine start properly? The fuel mixture needs to be extra rich > for starting. The automatic choke sets it that way, if it's working, which > it often doesn't. > > If you put the timing light on it while it's running properly, do the marks > line up? And then when you put the light on when you're trying to start it, > is the timing retarded or do the marks still line up? The timing should > shift severely back for starting and then the vacuum advance move the timing > up once the engine catches. Make sure it's moving the timing, don't spend > your time dicking with the vacuum system unless you verify that it isn't. > > Is there a good hot spark when you pull a plug out and watch it? An awful > lot of "carb problems" turn out to be ignition problems. > > If you disconnect the exhaust system, will it start right up? A partial > exhaust blockage may produce high back pressure at starting, but then the > blockage may be forced out of the way once the engine starts running. > > Don't just replace things, check them out one at a time. Think about what > is different between starting and running... and three big things are the > choke position, the timing advance position, and the exhaust pressure... > --scott > > -- > "C'est un Nagra. C'est suisse, et tres, tres precis." Thanks Scott, i have done all you have suggested. I am somewhat mechanically inclined,i fix all my own issues, but this has me stumped ! |
Why is my 1985 s 10 2.8 engine so hard to start ?
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Why is my 1985 s 10 2.8 engine so hard to start ?
Everything that Scott said was spot-on accurate.
With the engine cold, did you look down the carb with the choke open and work the throttle several times to see if you get a solid stream of gas yet? Let us know... Ben |
Why is my 1985 s 10 2.8 engine so hard to start ?
On 14/10/2017 6:35 AM, ben91932 wrote:
> Everything that Scott said was spot-on accurate. > With the engine cold, did you look down the carb with the choke open and work the throttle several times to see if you get a solid stream of gas yet? > Let us know... > Ben > Nobody seems to have asked the pertinent question; Is it hard to start *hot and/or cold*??? It makes a big difference as to where you start and direct your diagnosis -- Noddy! Have you made that call, sent that email? The number to call: 1300 304 064 The email address: Xeno |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Friday, October 13, 2017 at 5:17:53 PM UTC-5, Xeno wrote:
> On 14/10/2017 6:35 AM, ben91932 wrote: > > Everything that Scott said was spot-on accurate. > > With the engine cold, did you look down the carb with the choke open and work the throttle several times to see if you get a solid stream of gas yet? > > Let us know... > > Ben > > > Nobody seems to have asked the pertinent question; > > Is it hard to start *hot and/or cold*??? > > It makes a big difference as to where you start and direct your diagnosis > > -- > > Noddy! Have you made that call, sent that email? > The number to call: 1300 304 064 > The email address: > > > Xeno its harder to start when its cold. but it still dont start right when its hot. |
Why is my 1985 s 10 2.8 engine so hard to start ?
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Why is my 1985 s 10 2.8 engine so hard to start ?
On Friday, October 13, 2017 at 10:38:11 PM UTC-5, Bill Vanek wrote:
> On Thu, 5 Oct 2017 22:28:26 -0700 (PDT), RalphD66 > wrote: > > >Ok,i have been searching for an answer to why my truck is so hard to start. I have done everything i know to fix this but no luck yet . I have put a re-manufactured carburetor on it.I have checked all the vacuum lines,replaced the fuel pump. manual pump. I have a clear fuel filter that look good. I have done a tune up,plugs,wires,cap,pickup module,exc... I have even done a compression test that passes easily. The engine runs good, its just hard to start. Im stumped ! > > Is it always hard to start, or just after it's been sitting, like > overnight? |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Friday, October 13, 2017 at 10:38:11 PM UTC-5, Bill Vanek wrote:
> On Thu, 5 Oct 2017 22:28:26 -0700 (PDT), > wrote: > > >Ok,i have been searching for an answer to why my truck is so hard to start. I have done everything i know to fix this but no luck yet . I have put a re-manufactured carburetor on it.I have checked all the vacuum lines,replaced the fuel pump. manual pump. I have a clear fuel filter that look good. I have done a tune up,plugs,wires,cap,pickup module,exc... I have even done a compression test that passes easily. The engine runs good, its just hard to start. Im stumped ! > > Is it always hard to start, or just after it's been sitting, like > overnight? It hardest to start after sitting overnight, but its still a little hard to start after its been running. |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Friday, October 13, 2017 at 10:08:37 PM UTC-5, AMuzi wrote:
> On 10/13/2017 8:56 PM, wrote: > > On Friday, October 13, 2017 at 5:17:53 PM UTC-5, Xeno wrote: > >> On 14/10/2017 6:35 AM, ben91932 wrote: > >>> Everything that Scott said was spot-on accurate. > >>> With the engine cold, did you look down the carb with the choke open and work the throttle several times to see if you get a solid stream of gas yet? > >>> Let us know... > >>> Ben > >>> > >> Nobody seems to have asked the pertinent question; > >> > >> Is it hard to start *hot and/or cold*??? > >> > >> It makes a big difference as to where you start and direct your diagnosis > >> > >> -- > >> > >> Noddy! Have you made that call, sent that email? > >> The number to call: 1300 304 064 > >> The email address: > >> > >> > >> Xeno > > > > its harder to start when its cold. but it still dont start right when its hot. > > > > You mentioned 'rebuilt carb'. > > I don't know and I don't know your vehicle but rebuilt > carburetors nowadays can have the wrong aperture(s) in the > venturi cluster. Rebuilders seem not so diligent about > matching these for each application (many port sizes in the > same part blank get mixed after cleaning and before > assembly). Tracking down the actual spec and wire-gauge > measurement are tedious but if you've eliminated all else, > compare that to your original. Drove me nuts until I checked > it and swapped in the original. > > -- > Andrew Muzi > <www.yellowjersey.org/> > Open every day since 1 April, 1971 I dont understand aperture(s) in the venturi cluster. |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Fri, 13 Oct 2017 21:01:30 -0700 (PDT), RalphD66
> wrote: >On Friday, October 13, 2017 at 10:38:11 PM UTC-5, Bill Vanek wrote: >> On Thu, 5 Oct 2017 22:28:26 -0700 (PDT), >> wrote: >> >> >Ok,i have been searching for an answer to why my truck is so hard to start. I have done everything i know to fix this but no luck yet . I have put a re-manufactured carburetor on it.I have checked all the vacuum lines,replaced the fuel pump. manual pump. I have a clear fuel filter that look good. I have done a tune up,plugs,wires,cap,pickup module,exc... I have even done a compression test that passes easily. The engine runs good, its just hard to start. Im stumped ! >> >> Is it always hard to start, or just after it's been sitting, like >> overnight? > >It hardest to start after sitting overnight, but its still a little hard to start after its been running. I think others have already mentioned the obvious, so try a couple of other things. In the morning, make sure there is still fuel in the float bowl. If not, there might be an internal leak (well plugs). Also, check for fuel continuing to drip into the intake - it might have a bad needle and seat. Finally, this is the tough one. There is an issue called "coking" on some vehicles. Carbon builds up in the intake near the ports, and/or on the intake valves. That carbon - the coking - absorbs fuel vapor when you are trying to start the engine, and the result is that the engine is too lean to start easily. The main characteristic is that it is much, much worse when cold. The fix is obvious if it is a buildup on the valves, but if it's in the intake, that's another issue. Good luck with that. And I don't know of a proper diagnosis for this. It's more like a process of elimination, and that's all that's left. I also found this discussion on Google, coking is one of the mentions: http://www.s10forum.com/forum/f106/1...ed-help-70113/ |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Fri, 13 Oct 2017 21:25:03 -0700, Bill Vanek >
wrote: >On Fri, 13 Oct 2017 21:01:30 -0700 (PDT), RalphD66 > wrote: > >>On Friday, October 13, 2017 at 10:38:11 PM UTC-5, Bill Vanek wrote: >>> On Thu, 5 Oct 2017 22:28:26 -0700 (PDT), >>> wrote: >>> >>> >Ok,i have been searching for an answer to why my truck is so hard to start. I have done everything i know to fix this but no luck yet . I have put a re-manufactured carburetor on it.I have checked all the vacuum lines,replaced the fuel pump. manual pump. I have a clear fuel filter that look good. I have done a tune up,plugs,wires,cap,pickup module,exc... I have even done a compression test that passes easily. The engine runs good, its just hard to start. Im stumped ! >>> >>> Is it always hard to start, or just after it's been sitting, like >>> overnight? >> >>It hardest to start after sitting overnight, but its still a little hard to start after its been running. > >I think others have already mentioned the obvious, so try a couple of >other things. In the morning, make sure there is still fuel in the >float bowl. If not, there might be an internal leak (well plugs). >Also, check for fuel continuing to drip into the intake - it might >have a bad needle and seat. > >Finally, this is the tough one. There is an issue called "coking" on >some vehicles. Carbon builds up in the intake near the ports, and/or >on the intake valves. That carbon - the coking - absorbs fuel vapor >when you are trying to start the engine, and the result is that the >engine is too lean to start easily. The main characteristic is that it >is much, much worse when cold. The fix is obvious if it is a buildup >on the valves, but if it's in the intake, that's another issue. Good >luck with that. And I don't know of a proper diagnosis for this. It's >more like a process of elimination, and that's all that's left. > >I also found this discussion on Google, coking is one of the mentions: >http://www.s10forum.com/forum/f106/1...ed-help-70113/ I forgot to mentions that another obvious symptom of this is a severe hesitation until it warms up. That could also be the accelerator pump, but I'm sure others have mentioned that. |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Friday, October 13, 2017 at 11:27:15 PM UTC-5, Bill Vanek wrote:
> On Fri, 13 Oct 2017 21:25:03 -0700, Bill Vanek > > wrote: > > >On Fri, 13 Oct 2017 21:01:30 -0700 (PDT), RalphD66 > > wrote: > > > >>On Friday, October 13, 2017 at 10:38:11 PM UTC-5, Bill Vanek wrote: > >>> On Thu, 5 Oct 2017 22:28:26 -0700 (PDT), > >>> wrote: > >>> > >>> >Ok,i have been searching for an answer to why my truck is so hard to start. I have done everything i know to fix this but no luck yet . I have put a re-manufactured carburetor on it.I have checked all the vacuum lines,replaced the fuel pump. manual pump. I have a clear fuel filter that look good. I have done a tune up,plugs,wires,cap,pickup module,exc... I have even done a compression test that passes easily. The engine runs good, its just hard to start. Im stumped ! > >>> > >>> Is it always hard to start, or just after it's been sitting, like > >>> overnight? > >> > >>It hardest to start after sitting overnight, but its still a little hard to start after its been running. > > > >I think others have already mentioned the obvious, so try a couple of > >other things. In the morning, make sure there is still fuel in the > >float bowl. If not, there might be an internal leak (well plugs). > >Also, check for fuel continuing to drip into the intake - it might > >have a bad needle and seat. > > > >Finally, this is the tough one. There is an issue called "coking" on > >some vehicles. Carbon builds up in the intake near the ports, and/or > >on the intake valves. That carbon - the coking - absorbs fuel vapor > >when you are trying to start the engine, and the result is that the > >engine is too lean to start easily. The main characteristic is that it > >is much, much worse when cold. The fix is obvious if it is a buildup > >on the valves, but if it's in the intake, that's another issue. Good > >luck with that. And I don't know of a proper diagnosis for this. It's > >more like a process of elimination, and that's all that's left. > > > >I also found this discussion on Google, coking is one of the mentions: > >http://www.s10forum.com/forum/f106/1...ed-help-70113/ > > I forgot to mentions that another obvious symptom of this is a severe > hesitation until it warms up. That could also be the accelerator pump, > but I'm sure others have mentioned that. There is no hesitation at all. the engine runs great after it starts. |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Fri, 13 Oct 2017 22:47:51 -0700 (PDT), RalphD66
> wrote: >On Friday, October 13, 2017 at 11:27:15 PM UTC-5, Bill Vanek wrote: >> On Fri, 13 Oct 2017 21:25:03 -0700, Bill Vanek > >> wrote: >> >> >On Fri, 13 Oct 2017 21:01:30 -0700 (PDT), RalphD66 >> > wrote: >> > >> >>On Friday, October 13, 2017 at 10:38:11 PM UTC-5, Bill Vanek wrote: >> >>> On Thu, 5 Oct 2017 22:28:26 -0700 (PDT), >> >>> wrote: >> >>> >> >>> >Ok,i have been searching for an answer to why my truck is so hard to start. I have done everything i know to fix this but no luck yet . I have put a re-manufactured carburetor on it.I have checked all the vacuum lines,replaced the fuel pump. manual pump. I have a clear fuel filter that look good. I have done a tune up,plugs,wires,cap,pickup module,exc... I have even done a compression test that passes easily. The engine runs good, its just hard to start. Im stumped ! >> >>> >> >>> Is it always hard to start, or just after it's been sitting, like >> >>> overnight? >> >> >> >>It hardest to start after sitting overnight, but its still a little hard to start after its been running. >> > >> >I think others have already mentioned the obvious, so try a couple of >> >other things. In the morning, make sure there is still fuel in the >> >float bowl. If not, there might be an internal leak (well plugs). >> >Also, check for fuel continuing to drip into the intake - it might >> >have a bad needle and seat. >> > >> >Finally, this is the tough one. There is an issue called "coking" on >> >some vehicles. Carbon builds up in the intake near the ports, and/or >> >on the intake valves. That carbon - the coking - absorbs fuel vapor >> >when you are trying to start the engine, and the result is that the >> >engine is too lean to start easily. The main characteristic is that it >> >is much, much worse when cold. The fix is obvious if it is a buildup >> >on the valves, but if it's in the intake, that's another issue. Good >> >luck with that. And I don't know of a proper diagnosis for this. It's >> >more like a process of elimination, and that's all that's left. >> > >> >I also found this discussion on Google, coking is one of the mentions: >> >http://www.s10forum.com/forum/f106/1...ed-help-70113/ >> >> I forgot to mentions that another obvious symptom of this is a severe >> hesitation until it warms up. That could also be the accelerator pump, >> but I'm sure others have mentioned that. > >There is no hesitation at all. the engine runs great after it starts. Then it's not coking. If you have a float gauge, check the level while it's running. Leave the air cleaner off, and let it sit overnight, and check the float level in the morning before you try to start it. If the float is bottomed out in the bowl, you have a leak in the float bowl, and that's your problem. And to be honest, that doesn't seem all that likely. So let's get one thing straight, what do you mean by "hard starting"? Does it crank properly, or is it cranking slowly? Does the car start right up and then stall repeatedly? Or does it simply crank at proper speed without starting from the very beginning, and then finally start after extended cranking? And when it does start, is there black smoke, and rough running? |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Friday, October 13, 2017 at 7:47:52 PM UTC-10, RalphD66 wrote:
> On Friday, October 13, 2017 at 11:27:15 PM UTC-5, Bill Vanek wrote: > > On Fri, 13 Oct 2017 21:25:03 -0700, Bill Vanek > > > wrote: > > > > >On Fri, 13 Oct 2017 21:01:30 -0700 (PDT), RalphD66 > > > wrote: > > > > > >>On Friday, October 13, 2017 at 10:38:11 PM UTC-5, Bill Vanek wrote: > > >>> On Thu, 5 Oct 2017 22:28:26 -0700 (PDT), > > >>> wrote: > > >>> > > >>> >Ok,i have been searching for an answer to why my truck is so hard to start. I have done everything i know to fix this but no luck yet . I have put a re-manufactured carburetor on it.I have checked all the vacuum lines,replaced the fuel pump. manual pump. I have a clear fuel filter that look good. I have done a tune up,plugs,wires,cap,pickup module,exc... I have even done a compression test that passes easily. The engine runs good, its just hard to start. Im stumped ! > > >>> > > >>> Is it always hard to start, or just after it's been sitting, like > > >>> overnight? > > >> > > >>It hardest to start after sitting overnight, but its still a little hard to start after its been running. > > > > > >I think others have already mentioned the obvious, so try a couple of > > >other things. In the morning, make sure there is still fuel in the > > >float bowl. If not, there might be an internal leak (well plugs). > > >Also, check for fuel continuing to drip into the intake - it might > > >have a bad needle and seat. > > > > > >Finally, this is the tough one. There is an issue called "coking" on > > >some vehicles. Carbon builds up in the intake near the ports, and/or > > >on the intake valves. That carbon - the coking - absorbs fuel vapor > > >when you are trying to start the engine, and the result is that the > > >engine is too lean to start easily. The main characteristic is that it > > >is much, much worse when cold. The fix is obvious if it is a buildup > > >on the valves, but if it's in the intake, that's another issue. Good > > >luck with that. And I don't know of a proper diagnosis for this. It's > > >more like a process of elimination, and that's all that's left. > > > > > >I also found this discussion on Google, coking is one of the mentions: > > >http://www.s10forum.com/forum/f106/1...ed-help-70113/ > > > > I forgot to mentions that another obvious symptom of this is a severe > > hesitation until it warms up. That could also be the accelerator pump, > > but I'm sure others have mentioned that. > > There is no hesitation at all. the engine runs great after it starts. It's your electric choke on the carburetor. Look for the thermostat housing on the side of the carb and adjust it. |
Why is my 1985 s 10 2.8 engine so hard to start ?
On 10/13/2017 11:15 PM, RalphD66 wrote:
> On Friday, October 13, 2017 at 10:08:37 PM UTC-5, AMuzi wrote: >> On 10/13/2017 8:56 PM, wrote: >>> On Friday, October 13, 2017 at 5:17:53 PM UTC-5, Xeno wrote: >>>> On 14/10/2017 6:35 AM, ben91932 wrote: >>>>> Everything that Scott said was spot-on accurate. >>>>> With the engine cold, did you look down the carb with the choke open and work the throttle several times to see if you get a solid stream of gas yet? >>>>> Let us know... >>>>> Ben >>>>> >>>> Nobody seems to have asked the pertinent question; >>>> >>>> Is it hard to start *hot and/or cold*??? >>>> >>>> It makes a big difference as to where you start and direct your diagnosis >>>> >>>> -- >>>> >>>> Noddy! Have you made that call, sent that email? >>>> The number to call: 1300 304 064 >>>> The email address: >>>> >>>> >>>> Xeno >>> >>> its harder to start when its cold. but it still dont start right when its hot. >>> >> >> You mentioned 'rebuilt carb'. >> >> I don't know and I don't know your vehicle but rebuilt >> carburetors nowadays can have the wrong aperture(s) in the >> venturi cluster. Rebuilders seem not so diligent about >> matching these for each application (many port sizes in the >> same part blank get mixed after cleaning and before >> assembly). Tracking down the actual spec and wire-gauge >> measurement are tedious but if you've eliminated all else, >> compare that to your original. Drove me nuts until I checked >> it and swapped in the original. >> >> -- >> Andrew Muzi >> <www.yellowjersey.org/> >> Open every day since 1 April, 1971 > > I dont understand aperture(s) in the > venturi cluster. > The little holes have to be just the right size http://www.carburetor-parts.com/thum...axx=700&maxy=0 -- Andrew Muzi <www.yellowjersey.org/> Open every day since 1 April, 1971 |
Why is my 1985 s 10 2.8 engine so hard to start ?
Bill Vanek > wrote:
>Finally, this is the tough one. There is an issue called "coking" on >some vehicles. Carbon builds up in the intake near the ports, and/or >on the intake valves. That carbon - the coking - absorbs fuel vapor >when you are trying to start the engine, and the result is that the >engine is too lean to start easily. The main characteristic is that it >is much, much worse when cold. The fix is obvious if it is a buildup >on the valves, but if it's in the intake, that's another issue. Good >luck with that. And I don't know of a proper diagnosis for this. It's >more like a process of elimination, and that's all that's left. Is coking really an issue with modern engines and fuels? I remember my father talked about taking the car to the mechanic every spring to pull the heads and scrape everything down with a chisel, back when HE was a kid. Shouldn't be TOO hard to clean the intake.... but the original poster has had the carb off and should have seen if it was gunked up in there. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Saturday, October 14, 2017 at 2:52:59 AM UTC-5, Bill Vanek wrote:
> On Fri, 13 Oct 2017 22:47:51 -0700 (PDT), RalphD66 > > wrote: > > >On Friday, October 13, 2017 at 11:27:15 PM UTC-5, Bill Vanek wrote: > >> On Fri, 13 Oct 2017 21:25:03 -0700, Bill Vanek > > >> wrote: > >> > >> >On Fri, 13 Oct 2017 21:01:30 -0700 (PDT), RalphD66 > >> > wrote: > >> > > >> >>On Friday, October 13, 2017 at 10:38:11 PM UTC-5, Bill Vanek wrote: > >> >>> On Thu, 5 Oct 2017 22:28:26 -0700 (PDT), > >> >>> wrote: > >> >>> > >> >>> >Ok,i have been searching for an answer to why my truck is so hard to start. I have done everything i know to fix this but no luck yet . I have put a re-manufactured carburetor on it.I have checked all the vacuum lines,replaced the fuel pump. manual pump. I have a clear fuel filter that look good. I have done a tune up,plugs,wires,cap,pickup module,exc... I have even done a compression test that passes easily. The engine runs good, its just hard to start. Im stumped ! > >> >>> > >> >>> Is it always hard to start, or just after it's been sitting, like > >> >>> overnight? > >> >> > >> >>It hardest to start after sitting overnight, but its still a little hard to start after its been running. > >> > > >> >I think others have already mentioned the obvious, so try a couple of > >> >other things. In the morning, make sure there is still fuel in the > >> >float bowl. If not, there might be an internal leak (well plugs). > >> >Also, check for fuel continuing to drip into the intake - it might > >> >have a bad needle and seat. > >> > > >> >Finally, this is the tough one. There is an issue called "coking" on > >> >some vehicles. Carbon builds up in the intake near the ports, and/or > >> >on the intake valves. That carbon - the coking - absorbs fuel vapor > >> >when you are trying to start the engine, and the result is that the > >> >engine is too lean to start easily. The main characteristic is that it > >> >is much, much worse when cold. The fix is obvious if it is a buildup > >> >on the valves, but if it's in the intake, that's another issue. Good > >> >luck with that. And I don't know of a proper diagnosis for this. It's > >> >more like a process of elimination, and that's all that's left. > >> > > >> >I also found this discussion on Google, coking is one of the mentions: > >> >http://www.s10forum.com/forum/f106/1...ed-help-70113/ > >> > >> I forgot to mentions that another obvious symptom of this is a severe > >> hesitation until it warms up. That could also be the accelerator pump, > >> but I'm sure others have mentioned that. > > > >There is no hesitation at all. the engine runs great after it starts. > > Then it's not coking. If you have a float gauge, check the level while > it's running. Leave the air cleaner off, and let it sit overnight, and > check the float level in the morning before you try to start it. If > the float is bottomed out in the bowl, you have a leak in the float > bowl, and that's your problem. > > And to be honest, that doesn't seem all that likely. So let's get one > thing straight, what do you mean by "hard starting"? Does it crank > properly, or is it cranking slowly? Does the car start right up and > then stall repeatedly? Or does it simply crank at proper speed without > starting from the very beginning, and then finally start after > extended cranking? And when it does start, is there black smoke, and > rough running? It spins over properly at proper speed without starting. once it starts it runs fine. no black smoke or rough running. |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Saturday, October 14, 2017 at 8:58:32 AM UTC-5, Scott Dorsey wrote:
> Bill Vanek > wrote: > >Finally, this is the tough one. There is an issue called "coking" on > >some vehicles. Carbon builds up in the intake near the ports, and/or > >on the intake valves. That carbon - the coking - absorbs fuel vapor > >when you are trying to start the engine, and the result is that the > >engine is too lean to start easily. The main characteristic is that it > >is much, much worse when cold. The fix is obvious if it is a buildup > >on the valves, but if it's in the intake, that's another issue. Good > >luck with that. And I don't know of a proper diagnosis for this. It's > >more like a process of elimination, and that's all that's left. > > Is coking really an issue with modern engines and fuels? > > I remember my father talked about taking the car to the mechanic every > spring to pull the heads and scrape everything down with a chisel, > back when HE was a kid. > > Shouldn't be TOO hard to clean the intake.... but the original poster > has had the carb off and should have seen if it was gunked up in there. > --scott > -- > "C'est un Nagra. C'est suisse, et tres, tres precis." The intake is fine. |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Saturday, October 14, 2017 at 8:41:54 AM UTC-5, AMuzi wrote:
> On 10/13/2017 11:15 PM, RalphD66 wrote: > > On Friday, October 13, 2017 at 10:08:37 PM UTC-5, AMuzi wrote: > >> On 10/13/2017 8:56 PM, wrote: > >>> On Friday, October 13, 2017 at 5:17:53 PM UTC-5, Xeno wrote: > >>>> On 14/10/2017 6:35 AM, ben91932 wrote: > >>>>> Everything that Scott said was spot-on accurate. > >>>>> With the engine cold, did you look down the carb with the choke open and work the throttle several times to see if you get a solid stream of gas yet? > >>>>> Let us know... > >>>>> Ben > >>>>> > >>>> Nobody seems to have asked the pertinent question; > >>>> > >>>> Is it hard to start *hot and/or cold*??? > >>>> > >>>> It makes a big difference as to where you start and direct your diagnosis > >>>> > >>>> -- > >>>> > >>>> Noddy! Have you made that call, sent that email? > >>>> The number to call: 1300 304 064 > >>>> The email address: > >>>> > >>>> > >>>> Xeno > >>> > >>> its harder to start when its cold. but it still dont start right when its hot. > >>> > >> > >> You mentioned 'rebuilt carb'. > >> > >> I don't know and I don't know your vehicle but rebuilt > >> carburetors nowadays can have the wrong aperture(s) in the > >> venturi cluster. Rebuilders seem not so diligent about > >> matching these for each application (many port sizes in the > >> same part blank get mixed after cleaning and before > >> assembly). Tracking down the actual spec and wire-gauge > >> measurement are tedious but if you've eliminated all else, > >> compare that to your original. Drove me nuts until I checked > >> it and swapped in the original. > >> > >> -- > >> Andrew Muzi > >> <www.yellowjersey.org/> > >> Open every day since 1 April, 1971 > > > > I dont understand aperture(s) in the > > venturi cluster. > > > > The little holes have to be just the right size > > http://www.carburetor-parts.com/thum...axx=700&maxy=0 > > -- > Andrew Muzi > <www.yellowjersey.org/> > Open every day since 1 April, 1971 I dont have that piece in my carb. My car is a rochester varijet 10785350 |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Saturday, October 14, 2017 at 4:22:18 AM UTC-5, dsi1 wrote:
> On Friday, October 13, 2017 at 7:47:52 PM UTC-10, RalphD66 wrote: > > On Friday, October 13, 2017 at 11:27:15 PM UTC-5, Bill Vanek wrote: > > > On Fri, 13 Oct 2017 21:25:03 -0700, Bill Vanek > > > > wrote: > > > > > > >On Fri, 13 Oct 2017 21:01:30 -0700 (PDT), RalphD66 > > > > wrote: > > > > > > > >>On Friday, October 13, 2017 at 10:38:11 PM UTC-5, Bill Vanek wrote: > > > >>> On Thu, 5 Oct 2017 22:28:26 -0700 (PDT), > > > >>> wrote: > > > >>> > > > >>> >Ok,i have been searching for an answer to why my truck is so hard to start. I have done everything i know to fix this but no luck yet . I have put a re-manufactured carburetor on it.I have checked all the vacuum lines,replaced the fuel pump. manual pump. I have a clear fuel filter that look good. I have done a tune up,plugs,wires,cap,pickup module,exc... I have even done a compression test that passes easily. The engine runs good, its just hard to start. Im stumped ! > > > >>> > > > >>> Is it always hard to start, or just after it's been sitting, like > > > >>> overnight? > > > >> > > > >>It hardest to start after sitting overnight, but its still a little hard to start after its been running. > > > > > > > >I think others have already mentioned the obvious, so try a couple of > > > >other things. In the morning, make sure there is still fuel in the > > > >float bowl. If not, there might be an internal leak (well plugs). > > > >Also, check for fuel continuing to drip into the intake - it might > > > >have a bad needle and seat. > > > > > > > >Finally, this is the tough one. There is an issue called "coking" on > > > >some vehicles. Carbon builds up in the intake near the ports, and/or > > > >on the intake valves. That carbon - the coking - absorbs fuel vapor > > > >when you are trying to start the engine, and the result is that the > > > >engine is too lean to start easily. The main characteristic is that it > > > >is much, much worse when cold. The fix is obvious if it is a buildup > > > >on the valves, but if it's in the intake, that's another issue. Good > > > >luck with that. And I don't know of a proper diagnosis for this. It's > > > >more like a process of elimination, and that's all that's left. > > > > > > > >I also found this discussion on Google, coking is one of the mentions: > > > >http://www.s10forum.com/forum/f106/1...ed-help-70113/ > > > > > > I forgot to mentions that another obvious symptom of this is a severe > > > hesitation until it warms up. That could also be the accelerator pump, > > > but I'm sure others have mentioned that. > > > > There is no hesitation at all. the engine runs great after it starts. > > It's your electric choke on the carburetor. Look for the thermostat housing on the side of the carb and adjust it. I converted the choke to manual. |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Sat, 14 Oct 2017 07:51:42 -0700 (PDT), RalphD66
> wrote: >On Saturday, October 14, 2017 at 2:52:59 AM UTC-5, Bill Vanek wrote: >> On Fri, 13 Oct 2017 22:47:51 -0700 (PDT), RalphD66 >> > wrote: >> >> >On Friday, October 13, 2017 at 11:27:15 PM UTC-5, Bill Vanek wrote: >> >> On Fri, 13 Oct 2017 21:25:03 -0700, Bill Vanek > >> >> wrote: >> >> >> >> >On Fri, 13 Oct 2017 21:01:30 -0700 (PDT), RalphD66 >> >> > wrote: >> >> > >> >> >>On Friday, October 13, 2017 at 10:38:11 PM UTC-5, Bill Vanek wrote: >> >> >>> On Thu, 5 Oct 2017 22:28:26 -0700 (PDT), >> >> >>> wrote: >> >> >>> >> >> >>> >Ok,i have been searching for an answer to why my truck is so hard to start. I have done everything i know to fix this but no luck yet . I have put a re-manufactured carburetor on it.I have checked all the vacuum lines,replaced the fuel pump. manual pump. I have a clear fuel filter that look good. I have done a tune up,plugs,wires,cap,pickup module,exc... I have even done a compression test that passes easily. The engine runs good, its just hard to start. Im stumped ! >> >> >>> >> >> >>> Is it always hard to start, or just after it's been sitting, like >> >> >>> overnight? >> >> >> >> >> >>It hardest to start after sitting overnight, but its still a little hard to start after its been running. >> >> > >> >> >I think others have already mentioned the obvious, so try a couple of >> >> >other things. In the morning, make sure there is still fuel in the >> >> >float bowl. If not, there might be an internal leak (well plugs). >> >> >Also, check for fuel continuing to drip into the intake - it might >> >> >have a bad needle and seat. >> >> > >> >> >Finally, this is the tough one. There is an issue called "coking" on >> >> >some vehicles. Carbon builds up in the intake near the ports, and/or >> >> >on the intake valves. That carbon - the coking - absorbs fuel vapor >> >> >when you are trying to start the engine, and the result is that the >> >> >engine is too lean to start easily. The main characteristic is that it >> >> >is much, much worse when cold. The fix is obvious if it is a buildup >> >> >on the valves, but if it's in the intake, that's another issue. Good >> >> >luck with that. And I don't know of a proper diagnosis for this. It's >> >> >more like a process of elimination, and that's all that's left. >> >> > >> >> >I also found this discussion on Google, coking is one of the mentions: >> >> >http://www.s10forum.com/forum/f106/1...ed-help-70113/ >> >> >> >> I forgot to mentions that another obvious symptom of this is a severe >> >> hesitation until it warms up. That could also be the accelerator pump, >> >> but I'm sure others have mentioned that. >> > >> >There is no hesitation at all. the engine runs great after it starts. >> >> Then it's not coking. If you have a float gauge, check the level while >> it's running. Leave the air cleaner off, and let it sit overnight, and >> check the float level in the morning before you try to start it. If >> the float is bottomed out in the bowl, you have a leak in the float >> bowl, and that's your problem. >> >> And to be honest, that doesn't seem all that likely. So let's get one >> thing straight, what do you mean by "hard starting"? Does it crank >> properly, or is it cranking slowly? Does the car start right up and >> then stall repeatedly? Or does it simply crank at proper speed without >> starting from the very beginning, and then finally start after >> extended cranking? And when it does start, is there black smoke, and >> rough running? > >It spins over properly at proper speed without starting. once it starts it runs fine. no black smoke or rough running. Well then, did you check to see if there is any fuel in the float bowl in the morning? That's really about all it can be. Or that combined with a fuel line that is also empty, and possibly a fuel pump issue. Did you at least look to see if the accelerator pump is squirting in the morning? |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Saturday, October 14, 2017 at 4:58:08 AM UTC-10, RalphD66 wrote:
> > I converted the choke to manual. Visually check to make sure your choke is working correctly. |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Saturday, October 14, 2017 at 1:27:30 PM UTC-5, Bill Vanek wrote:
> On Sat, 14 Oct 2017 07:51:42 -0700 (PDT), RalphD66 > > wrote: > > >On Saturday, October 14, 2017 at 2:52:59 AM UTC-5, Bill Vanek wrote: > >> On Fri, 13 Oct 2017 22:47:51 -0700 (PDT), RalphD66 > >> > wrote: > >> > >> >On Friday, October 13, 2017 at 11:27:15 PM UTC-5, Bill Vanek wrote: > >> >> On Fri, 13 Oct 2017 21:25:03 -0700, Bill Vanek > > >> >> wrote: > >> >> > >> >> >On Fri, 13 Oct 2017 21:01:30 -0700 (PDT), RalphD66 > >> >> > wrote: > >> >> > > >> >> >>On Friday, October 13, 2017 at 10:38:11 PM UTC-5, Bill Vanek wrote: > >> >> >>> On Thu, 5 Oct 2017 22:28:26 -0700 (PDT), > >> >> >>> wrote: > >> >> >>> > >> >> >>> >Ok,i have been searching for an answer to why my truck is so hard to start. I have done everything i know to fix this but no luck yet . I have put a re-manufactured carburetor on it.I have checked all the vacuum lines,replaced the fuel pump. manual pump. I have a clear fuel filter that look good. I have done a tune up,plugs,wires,cap,pickup module,exc... I have even done a compression test that passes easily. The engine runs good, its just hard to start. Im stumped ! > >> >> >>> > >> >> >>> Is it always hard to start, or just after it's been sitting, like > >> >> >>> overnight? > >> >> >> > >> >> >>It hardest to start after sitting overnight, but its still a little hard to start after its been running. > >> >> > > >> >> >I think others have already mentioned the obvious, so try a couple of > >> >> >other things. In the morning, make sure there is still fuel in the > >> >> >float bowl. If not, there might be an internal leak (well plugs). > >> >> >Also, check for fuel continuing to drip into the intake - it might > >> >> >have a bad needle and seat. > >> >> > > >> >> >Finally, this is the tough one. There is an issue called "coking" on > >> >> >some vehicles. Carbon builds up in the intake near the ports, and/or > >> >> >on the intake valves. That carbon - the coking - absorbs fuel vapor > >> >> >when you are trying to start the engine, and the result is that the > >> >> >engine is too lean to start easily. The main characteristic is that it > >> >> >is much, much worse when cold. The fix is obvious if it is a buildup > >> >> >on the valves, but if it's in the intake, that's another issue. Good > >> >> >luck with that. And I don't know of a proper diagnosis for this. It's > >> >> >more like a process of elimination, and that's all that's left. > >> >> > > >> >> >I also found this discussion on Google, coking is one of the mentions: > >> >> >http://www.s10forum.com/forum/f106/1...ed-help-70113/ > >> >> > >> >> I forgot to mentions that another obvious symptom of this is a severe > >> >> hesitation until it warms up. That could also be the accelerator pump, > >> >> but I'm sure others have mentioned that. > >> > > >> >There is no hesitation at all. the engine runs great after it starts. > >> > >> Then it's not coking. If you have a float gauge, check the level while > >> it's running. Leave the air cleaner off, and let it sit overnight, and > >> check the float level in the morning before you try to start it. If > >> the float is bottomed out in the bowl, you have a leak in the float > >> bowl, and that's your problem. > >> > >> And to be honest, that doesn't seem all that likely. So let's get one > >> thing straight, what do you mean by "hard starting"? Does it crank > >> properly, or is it cranking slowly? Does the car start right up and > >> then stall repeatedly? Or does it simply crank at proper speed without > >> starting from the very beginning, and then finally start after > >> extended cranking? And when it does start, is there black smoke, and > >> rough running? > > > >It spins over properly at proper speed without starting. once it starts it runs fine. no black smoke or rough running. > > Well then, did you check to see if there is any fuel in the float bowl > in the morning? That's really about all it can be. Or that combined > with a fuel line that is also empty, and possibly a fuel pump issue. > Did you at least look to see if the accelerator pump is squirting in > the morning? Not yet but im going to soon. Ill let you know. |
Why is my 1985 s 10 2.8 engine so hard to start ?
On 14/10/2017 6:52 PM, Bill Vanek wrote:
> On Fri, 13 Oct 2017 22:47:51 -0700 (PDT), RalphD66 > > wrote: > >> On Friday, October 13, 2017 at 11:27:15 PM UTC-5, Bill Vanek wrote: >>> On Fri, 13 Oct 2017 21:25:03 -0700, Bill Vanek > >>> wrote: >>> >>>> On Fri, 13 Oct 2017 21:01:30 -0700 (PDT), RalphD66 >>>> > wrote: >>>> >>>>> On Friday, October 13, 2017 at 10:38:11 PM UTC-5, Bill Vanek wrote: >>>>>> On Thu, 5 Oct 2017 22:28:26 -0700 (PDT), >>>>>> wrote: >>>>>> >>>>>>> Ok,i have been searching for an answer to why my truck is so hard to start. I have done everything i know to fix this but no luck yet . I have put a re-manufactured carburetor on it.I have checked all the vacuum lines,replaced the fuel pump. manual pump. I have a clear fuel filter that look good. I have done a tune up,plugs,wires,cap,pickup module,exc... I have even done a compression test that passes easily. The engine runs good, its just hard to start. Im stumped ! >>>>>> >>>>>> Is it always hard to start, or just after it's been sitting, like >>>>>> overnight? >>>>> >>>>> It hardest to start after sitting overnight, but its still a little hard to start after its been running. >>>> >>>> I think others have already mentioned the obvious, so try a couple of >>>> other things. In the morning, make sure there is still fuel in the >>>> float bowl. If not, there might be an internal leak (well plugs). >>>> Also, check for fuel continuing to drip into the intake - it might >>>> have a bad needle and seat. >>>> >>>> Finally, this is the tough one. There is an issue called "coking" on >>>> some vehicles. Carbon builds up in the intake near the ports, and/or >>>> on the intake valves. That carbon - the coking - absorbs fuel vapor >>>> when you are trying to start the engine, and the result is that the >>>> engine is too lean to start easily. The main characteristic is that it >>>> is much, much worse when cold. The fix is obvious if it is a buildup >>>> on the valves, but if it's in the intake, that's another issue. Good >>>> luck with that. And I don't know of a proper diagnosis for this. It's >>>> more like a process of elimination, and that's all that's left. >>>> >>>> I also found this discussion on Google, coking is one of the mentions: >>>> http://www.s10forum.com/forum/f106/1...ed-help-70113/ >>> >>> I forgot to mentions that another obvious symptom of this is a severe >>> hesitation until it warms up. That could also be the accelerator pump, >>> but I'm sure others have mentioned that. >> >> There is no hesitation at all. the engine runs great after it starts. > > Then it's not coking. If you have a float gauge, check the level while > it's running. Leave the air cleaner off, and let it sit overnight, and > check the float level in the morning before you try to start it. If > the float is bottomed out in the bowl, you have a leak in the float > bowl, and that's your problem. Coking is less likely on a carbureted or port fueled engine. Fuel wash prevents that occurring. That's an issue with diesels and GDI engines. > > And to be honest, that doesn't seem all that likely. So let's get one > thing straight, what do you mean by "hard starting"? Does it crank > properly, or is it cranking slowly? Does the car start right up and > then stall repeatedly? Or does it simply crank at proper speed without > starting from the very beginning, and then finally start after > extended cranking? And when it does start, is there black smoke, and > rough running? > -- Noddy! Have you made that call, sent that email? The number to call: 1300 304 064 The email address: Xeno |
Why is my 1985 s 10 2.8 engine so hard to start ?
On 15/10/2017 12:58 AM, Scott Dorsey wrote:
> Bill Vanek > wrote: >> Finally, this is the tough one. There is an issue called "coking" on >> some vehicles. Carbon builds up in the intake near the ports, and/or >> on the intake valves. That carbon - the coking - absorbs fuel vapor >> when you are trying to start the engine, and the result is that the >> engine is too lean to start easily. The main characteristic is that it >> is much, much worse when cold. The fix is obvious if it is a buildup >> on the valves, but if it's in the intake, that's another issue. Good >> luck with that. And I don't know of a proper diagnosis for this. It's >> more like a process of elimination, and that's all that's left. > > Is coking really an issue with modern engines and fuels? Yes but it has a lot to do with how the fuel enters the engine. In a diesel, the fuel is injected directly into the combustion chamber. Same as with Gasoline Direct Injection. That means that any fuel, or oil, that gets into the intake system on these engines can *burn* onto the *back of the inlet valve* and turn into a hard carbon build up - coking. If you're wondering how fuel gets into the manifold if it's injected directly into the combustion chamber, think of PCV and EGR systems. Also, some GDI systems use valve timing as a pseudo EGR system. This should explain it; http://www.aa1car.com/library/intake...di_engines.htm and this; http://www.aa1car.com/library/what_i..._injection.htm > > I remember my father talked about taking the car to the mechanic every > spring to pull the heads and scrape everything down with a chisel, > back when HE was a kid. Different kind of coking. That's combustion chamber coking. > > Shouldn't be TOO hard to clean the intake.... but the original poster > has had the carb off and should have seen if it was gunked up in there. > --scott > -- Noddy! Have you made that call, sent that email? The number to call: 1300 304 064 The email address: Xeno |
Why is my 1985 s 10 2.8 engine so hard to start ?
On 15/10/2017 1:56 AM, RalphD66 wrote:
> rochester varijet 10785350 I am surprised you bought a *rebuilt carb*. Those are not generally considered worth rebuilding nor were they designed to be rebuilt. What is generally done is a brand new replacement and, from what I recall from that era, they were not expensive as a new part. Certainly the parts and labour cost would exceed the cost of a new car, if my memory serves me correctly. This may be where your issue lies. The Varajet was supposed to be a lean burn unit for pollution control. It may be set a tad too lean. That will definitely give you hot start issues at the very least. -- Noddy! Have you made that call, sent that email? The number to call: 1300 304 064 The email address: Xeno |
Why is my 1985 s 10 2.8 engine so hard to start ?
On 15/10/2017 6:23 PM, Xeno wrote:
> On 15/10/2017 1:56 AM, RalphD66 wrote: >> rochester varijet 10785350 > > I am surprised you bought a *rebuilt carb*. Those are not generally > considered worth rebuilding nor were they designed to be rebuilt. What > is generally done is a brand new replacement and, from what I recall > from that era, they were not expensive as a new part. Certainly the > parts and labour cost would exceed the cost of a new car, if my memory > serves me correctly. > > This may be where your issue lies. The Varajet was supposed to be a lean > burn unit for pollution control. It may be set a tad too lean. That will > definitely give you hot start issues at the very least. > Errata parts and labour cost would exceed the cost of a new carburetor. -- Noddy! Have you made that call, sent that email? The number to call: 1300 304 064 The email address: Xeno |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Sun, 15 Oct 2017 18:08:32 +1100, Xeno >
wrote: >Coking is less likely on a carbureted or port fueled engine. Fuel wash >prevents that occurring. That's an issue with diesels and GDI engines. It's not all that common, but there are certain vehicles that are prone to it. GM's G vans from the 80's or 90's were one, and I had an Allante with a severe case of it. I believe I also had a 2.8 Chevy engine in some vehicle with the problem. I think it's more likely with very high underhood temps. |
Why is my 1985 s 10 2.8 engine so hard to start ?
dsi1 > wrote:
>On Saturday, October 14, 2017 at 4:58:08 AM UTC-10, RalphD66 wrote: >> >> I converted the choke to manual. > >Visually check to make sure your choke is working correctly. I was leaning very strongly toward this being the case, that the choke is not leaning down enough. But I suggested earlier than he try manually blocking the intake to simulate aggressive choking and he said that didn't help. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Tuesday, October 17, 2017 at 3:34:18 AM UTC-10, Scott Dorsey wrote:
> > I was leaning very strongly toward this being the case, that the choke is not > leaning down enough. But I suggested earlier than he try manually blocking > the intake to simulate aggressive choking and he said that didn't help. > --scott > -- > "C'est un Nagra. C'est suisse, et tres, tres precis." It's a cold start problem with a carburetor. This should be dead simple to fix. He needs have an old fart mechanic look at his carb. |
Why is my 1985 s 10 2.8 engine so hard to start ?
dsi1 > wrote:
>On Tuesday, October 17, 2017 at 3:34:18 AM UTC-10, Scott Dorsey wrote: >> >> I was leaning very strongly toward this being the case, that the choke is not >> leaning down enough. But I suggested earlier than he try manually blocking >> the intake to simulate aggressive choking and he said that didn't help. > >It's a cold start problem with a carburetor. This should be dead simple to fix. He needs have an old fart mechanic look at his carb. You'd think so. But back in the seventies _everybody_ had a carb and _everybody_ had cold start problems. It was just considered normal. Hmm, maybe there is a correlation here. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Tuesday, October 17, 2017 at 1:51:15 PM UTC-10, Scott Dorsey wrote:
> > You'd think so. But back in the seventies _everybody_ had a carb and > _everybody_ had cold start problems. It was just considered normal. > Hmm, maybe there is a correlation here. > --scott > > -- > "C'est un Nagra. C'est suisse, et tres, tres precis." I'll take your word for it. I live in the tropics so cold starting is not too much of a problem. I use to have a Barracuda that the previous owner disconnected the choke linkage. As I recall, the bimetal spring was located in the intake manifold. I'd have to idle the car for a while until the car warmed up. Beats the heck out of me why people want to disconnect an automatic choke. |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Tue, 17 Oct 2017 16:46:56 -0700 (PDT), dsi1 >
wrote: >On Tuesday, October 17, 2017 at 3:34:18 AM UTC-10, Scott Dorsey wrote: >> >> I was leaning very strongly toward this being the case, that the choke is not >> leaning down enough. But I suggested earlier than he try manually blocking >> the intake to simulate aggressive choking and he said that didn't help. >> --scott >> -- >> "C'est un Nagra. C'est suisse, et tres, tres precis." > >It's a cold start problem with a carburetor. This should be dead simple to fix. Yes, which is why I'm inclined to think that there might be a bit of trolling going on. None of his replies seemed to ring true. In fact, his replies seemed to be, "it's not that" mostly. |
Why is my 1985 s 10 2.8 engine so hard to start ?
On Tuesday, October 17, 2017 at 3:08:50 PM UTC-10, Bill Vanek wrote:
> > Yes, which is why I'm inclined to think that there might be a bit of > trolling going on. None of his replies seemed to ring true. In fact, > his replies seemed to be, "it's not that" mostly. You could be right about this. |
Why is my 1985 s 10 2.8 engine so hard to start ?
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Why is my 1985 s 10 2.8 engine so hard to start ?
dsi1 wrote:
> On Tuesday, October 17, 2017 at 3:08:50 PM UTC-10, Bill Vanek wrote: >> Yes, which is why I'm inclined to think that there might be a bit of >> trolling going on. None of his replies seemed to ring true. In fact, >> his replies seemed to be, "it's not that" mostly. > > You could be right about this. I can say the only time I ever had a cold start issue in my old 85 SBlazer with the 2.8 it was due to the baseplate heater not working. That carb is VERY fussy when it comes to the choke adjustment and they were always set on the lean side. Do you have the list of settings for all the linkages and controls? Is this a feedback or non-feedback carb? They used both depending on the emissions controls you had. What is your current starting procedure for cold and warm? You mentioned you converted to manual choke? Why? Was that done before or after the hard starting? What fuel are you running? Does it have ethanol in it? If yes, that alone will cause starting issues in a carb not adjusted for it. -- Steve W. |
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