Question about GMC S-15
Put a carb kit in it, float is probably saturated causing it to run rich all the time.
Posted on Jun 26, 2013
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Posted on Jan 02, 2017
SOURCE: Stalling and black smoke
Your truck is fuel injected . Black smoke indicates a rich fuel mixture. This could be caused by numerous items. A faulty sensor, a faulty injector, a misfiring spark plug are some of them. To really zone in on the problem, a computer diagnosis is required to note sensor readings, and repair as necessary.
Posted on Mar 30, 2009
Sounds like bad injectors, bad O2 sensors, and or too much fuel psi. Check the fuel psi against what the service manual says. If the fuel psi is too high, your regulator is bad. If the fuel psi checks out ok, you likely have a bad O2 or bad fuel injector(s).
Posted on Apr 15, 2009
Take it to an Autozone or O'Reillys and they will test the computer for you. It should have set a code, but you don't know if the code light works so its your best bet. Sounds like it is running rich and the crankshaft module is not advancing the timing.
Posted on May 11, 2009
Search for vacuum leaks. Could be your head gasket, or oil rings. Black smoke = oil is being burned. Which would mean that either your oil rings are worn out (for whatever reason, since your truck is fairly new) or that you have a head gasket problem.
Posted on Jun 04, 2009
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