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Carb adjustment 1994 GMC throttle body carburetor

I have a 1994 GMC 2500 1994 with a throttle body carburetor that is running rich and I need to know how to adjust it. also the factory cap is off so I need to know how to adjust that too.

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  • Cars & Trucks Master
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A 1994 model should have throttle body injection, not a carb.
There's nothing to adjust for fuel mixture. That is controlled by the engine computer based on 5 or 6 inputs.
The problem could be one of the injectors, or something else.

Posted on Feb 14, 2014


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Posted on Jan 02, 2017

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SOURCE: gmc vandura 1996, 3500 running rich

There could be all kinds of reasons your vehicle runs rich. It should be fuel injected not carborated. It could have a bad injector, bad air filter, o2 sensors etc. Have it scaned for the reason.

Posted on May 18, 2008

  • 92 Answers

SOURCE: 1994 Yukon running rich and flooding

Fuel pump circuit (low voltage)
Try replacing the fuel pump relay or testing it if you have the manual.

Posted on Sep 20, 2009

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SOURCE: how do i adjust carb on 84 cj 7

The first thing to do is make sure that the problem is not the choke butterfly. Make sure it is opening all the way because a partially open choke can mimic improper idle screw adjustment, letting it run rich. If the choke is good then you will find the idle adjustment screws at the front of your carb. They are under the float bowl almost touching the intake manifold. This is easy to screw up so be careful and take your time. Turn both screws equally, the same way and the same amount. Use 1/4 turns and try running the engine after each 1/4 turn. Rev the engine up 2 or 3 times and let it come back to idle.If it stalls then turn it up a bit so it doesn't. You may have to adjust your RPM if it idles to low at the throttle linkage. There will be a screw stop there for that purpose, turn it in to speed up and out to slow down. It's a trial and error exercise even for professionals so take your time. Hope this helps.

Posted on Nov 02, 2009

  • 1 Answer

SOURCE: running rich

92 sierras do not have MAF sensors, they came in in 96. I have the same problem on my 95 sierra and it seems to be linked to my O2 sensor but it might acually be your oil pressure sensor. If your oil pressure sensor is reading off then it could cause your O2 sensor to read a constant lean or rich fuel mixture. Don't ask me how the 2 are linked, because i am not sure.

Posted on Jan 17, 2010

  • 1 Answer

SOURCE: I need to know how to convert a throttle body carb to a 4 barrel

you can buy an itake to convert it you dont need to change the heads the 4 center bolts have just a slightly differant angle then change the distributar slap a carb on and put an inline fuel pump and your good to go

Posted on Feb 13, 2010

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Tune up and clean the throttle plate

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