Question about 1994 GMC Sonoma

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Truck getting too much gas. 94 GMC Sonoma. V6 engine. Black smoke out exaust. Plugs keep fouling out. I Changed everything fuel related plus computer under dash board. Truck not starting now. HELP.

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Did you check sensors such as crank senors? cam sensor? knock sensor? or mass air flow? Could all be causing it to get to much fuel. Just had same problem on 1997 Chevy Lumina

Posted on Jul 03, 2009

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1991 Honda Accord, 213k, changed oily sparkplugs and now engine blows excessive smoke and oil continuously out the exaust from start up to shut down.


Old spark plugs were likely fouled with oil and not burning fuel (and oil) completely so minimal smoke before change out. New plugs are clean and burning everything in cylinders well including oil (therefore more smoke). If smoke from exhaust is blue, then engine oil is getting into cylinders either through worn out piston rings, or a leaking gasket. If black smoke, then this is a sign of too much fuel getting into cylinders and not all the fuel is getting burnt during combustion (a fuel system problem).

Sep 06, 2013 | Cars & Trucks

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I have an 1987 gmc jimmy s15 with a tbi 2.8 v6 with about 201000 miles on it.I've been haveing a few issues with a bad miss and revs at idle and now is blowing black smoke. I've changed the plugs...


Bad miss & erratic idle can be the T.P.S. had the same problem on an 89 S10 & 91 Sonoma. As for black smoke sounds like oil in cylinders. If the truck has REALLY bad blow by & REALLY worn P.C.V. Valve that can make it smoke too. If not then probably the piston rings with that many miles.

Nov 04, 2012 | Cars & Trucks

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My 98 sonoma truck runs but lacks power with service engine soon light on .trouble code reads po300 cylinder misfire detected (random) what dose this mean


See also: P0300 diagnostic code @ OBD-Codes.com
Possible Causes:
Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

Mar 13, 2011 | GMC Sonoma Cars & Trucks

1 Answer

1996 gmc sierra, have changed fuel pump and fuel filter. can smell plenty of gas coming out of exhaust pipe. tested for spark, have spark.. truck will crank but not start. what can i try or check now?


Check the timing and make sure the battery is good, the battery can sometime have the power to crank the engine but have internal problems that leave it without enough voltage to give you a hot enough spark to start the engine.
You could also have some bad ignition parts which could be shorting out your spark or sending it to the wrong spark plugs. Plus you could also have fouled spark plugs.

Jun 25, 2010 | 2000 GMC New Sierra 1500

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My truck seems to be running to rich on fuel when starting after it is warmed up, cold starts are fine. 1999 gmc


There is a possibility that your temperature sending unit for the computer is not working correctly. ( not the sending unit for the gage, there are two). If the computer never knows that the engine warms up, it will keep "choking" and over fueling. Thus, the black spark plugs.

Jan 02, 2010 | 1999 GMC Sierra

1 Answer

My truck misses when it is first started and run ok when it warms up. It is a 4.3 motor automatic.


Do you get black exhaust smoke when first started? If so, then there is too much fuel at first which probably fouls several spark plugs, but as the engine warms up, the plugs start firing again. If no black smoke--is the check engine light ON? Read the code(s) if so and follow the clues.

Aug 02, 2009 | 1996 GMC Sonoma

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Gmc 94 sonoma


When was the last time the fuel filter was chg.? If thats not an issue best to get a fuel pressure test.

Apr 11, 2009 | 1994 GMC Sonoma

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1995 GMC Saffari


sounds like you may have jumped a tooth or 2 timing belt may need to be changed this is the symptoms on the safari van black smoke unburnt fuel take out spark plugs and inspect them should tell you the story weather the plug is fireing or weather the timing is way off causing excess exaust gas from charing plugs good luck with problem

Jul 01, 2008 | 1995 GMC Safari

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