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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