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#1 |
Registered User
Join Date: Jan 2004
Location: kansas
Posts: 49
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'85 Chevy carb problems
I've got an '85 Chevy 3/4 ton 4x4. It has the same engine in it as the Corvettes had that year. I've had the dang thing in the shop several times because I don't know anything about carbs. It soots up the spark plugs really bad about a week after replacing them. I've had the carb rebuilt and adjusted 3 times by two completely differnt shops. It still does the same thing..... soots the plugs up and misses really bad. Can anyone help me out? NO BODY can seem to get this dang thing to run right. It ran perfect until one of my employees ran the thing out of oil and I had to replace the engine!!!
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1987 GMC 1500 5.7L 1985 Chevy 3/4 4X4 2001 Chevy 2500 HD 4X4 2007 Chevy 3500 Duramax 4X4 |
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#2 |
You get what you pay for
![]() Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
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Not knowing for sure, but it sounds like you have a computer controlled carb on it since you say it's the same engines Corvettes had in 85. If this is the case, you will never get it to run right without the computer. What happened to the carb that was on the stock engine?
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Mike 1985 Chevy C-10 |
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#3 |
Registered User
Join Date: Jan 2004
Location: kansas
Posts: 49
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This is the same carb. I don't think it is controlled by the computer. The only electrical wire running to it is going to the choke. It is the same engine as the corvettes that year; I checked that out with the local dealership.
__________________
1987 GMC 1500 5.7L 1985 Chevy 3/4 4X4 2001 Chevy 2500 HD 4X4 2007 Chevy 3500 Duramax 4X4 |
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#4 |
DAMN, I love Big Blocks!
Join Date: Aug 2003
Location: New Mexico, USA
Posts: 619
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Are you sure that you don't have an oil-fouling problem?
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Marc Bona Hobbs, New Mexico 1976 1/2 ton GMC High Sierra. 454 c.i.d./ TH400. *Soon to get a mild warming over.* 3.40 rear. ![]() |
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#5 |
Registered User
Join Date: Jan 2004
Location: kansas
Posts: 49
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I don't know what you mean by an oil fouling problem.
__________________
1987 GMC 1500 5.7L 1985 Chevy 3/4 4X4 2001 Chevy 2500 HD 4X4 2007 Chevy 3500 Duramax 4X4 |
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#6 |
DAMN, I love Big Blocks!
Join Date: Aug 2003
Location: New Mexico, USA
Posts: 619
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I mean are you sure it's not oil fouling the plugs instead of unburnt fuel?
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Marc Bona Hobbs, New Mexico 1976 1/2 ton GMC High Sierra. 454 c.i.d./ TH400. *Soon to get a mild warming over.* 3.40 rear. ![]() |
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#7 |
Registered User
Join Date: Jan 2004
Location: kansas
Posts: 49
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I don't know. What are some signs to look for? It blows black smoke, which I assume is from the dirty spark plugs not burning all the fuel off. What would cause the oil to foul the plugs?
__________________
1987 GMC 1500 5.7L 1985 Chevy 3/4 4X4 2001 Chevy 2500 HD 4X4 2007 Chevy 3500 Duramax 4X4 |
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#8 |
I do everything twice, so what
Join Date: Mar 2004
Location: To the Right. One may go as far to say WAY to the Right
Posts: 378
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Just a note, but are you sure the plugs are the correct heat range?
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#9 |
Registered User
Join Date: Jan 2004
Location: kansas
Posts: 49
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What would cause the oil to foul the plugs?
__________________
1987 GMC 1500 5.7L 1985 Chevy 3/4 4X4 2001 Chevy 2500 HD 4X4 2007 Chevy 3500 Duramax 4X4 |
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#10 |
Registered User
Join Date: Sep 2004
Location: Buxton, ME
Posts: 91
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If it's blowing black smoke, it's running too rich....
Does it run poorly through the whole temperature range or just warm? Is the replacement engine identical to the one you took out? If not, perhaps it's too much carb for it. The carb may be setup for the higher performance engine. You may have to re-jet the carb if that is the case... Just a thought... |
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