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Why is my 1985 s 10 2.8 engine so hard to start ?



 
 
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  #31  
Old October 15th 17, 08:26 AM posted to rec.autos.tech
Xeno
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Posts: 76
Default 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.

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  #32  
Old October 15th 17, 09:28 AM posted to rec.autos.tech
Bill Vanek[_2_]
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Posts: 79
Default 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.
  #33  
Old Yesterday, 02:34 PM posted to rec.autos.tech
Scott Dorsey
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Posts: 3,744
Default 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."
  #34  
Old Today, 12:46 AM posted to rec.autos.tech
dsi1[_11_]
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Posts: 245
Default 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.
  #35  
Old Today, 12:51 AM posted to rec.autos.tech
Scott Dorsey
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Posts: 3,744
Default 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."
  #36  
Old Today, 01:19 AM posted to rec.autos.tech
dsi1[_11_]
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Posts: 245
Default 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.
  #37  
Old Today, 02:08 AM posted to rec.autos.tech
Bill Vanek[_2_]
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Posts: 79
Default 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.
  #38  
Old Today, 02:56 AM posted to rec.autos.tech
dsi1[_11_]
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Posts: 245
Default 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.
  #40  
Old Today, 06:25 AM posted to rec.autos.tech
Steve W.[_6_]
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Posts: 1,035
Default 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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