Question about 2002 GMC Sierra C/K1500

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I have a 2002 GMC sierra that is misfiring on three different cylinders why?

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  • hunterdenton Feb 09, 2009

    random misfire new plugs and wires didnt fix it

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Could be a coil problem or what controls the coils. like a crankshaft sensor camshaft sensor.

Maybe the injectors are sticking.
Just a few things to take inconsideration while testing.

if the cylinders are on one side possible wiring problem, if they are scattering then could be the above things.

Posted on Feb 09, 2009

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I have an 01 gmc sierra 2500 hd with a po308 code


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hope it helps

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Tip

GMC Sierra Code P0300 Check engine light


GMC Sierra with the code P0300 Q: I have the 2003 GMC Sierra with the code P0300. What could be the problem? A: The code P0300 means "Random Cylinder Misfire". This means that the engine computer has detected that one or more of the cylinders misfire randomly. This code could take some time to diagnose, as there could be a wide range of reasons for the engine cylinders to misfire. Here are just a few examples: bad spark plugs, ignition wires, distributor cap/rotor, bad fuel injectors, bad airflow sensor, broken or weak valve spring, leaking valve, low fuel pressure, manifold gasket leak, clogged catalytic converter, etc. Take your truck to a knowledgeable mechanic and have it check out - driving with the misfiring engine can damage your catalytic converter.
The mechanic can scan the engine computer with the scan tool and see the conditions when the misfire happens and check which cylinders are misfiring. A number of of other things will need to be checked to find the cause (e.g vacuum leaks, exhaust back-pressure, compression, etc.).

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Normally you would perform a compression test on all 8 cylinders and then average them out. Each cylinder should be within 10 percent of the others.

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1 Answer

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