Question about 2002 Chevrolet TrailBlazer

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I have a misfire in cylinder #2 on a 2002 chevrolet trailblazer, with an 4.2L 6cylinder. I've changed the spark plugs and put a new coil in. It Still runs rough. What else could it be?

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If you do not have a vacuum leak these are know for clogging injectors. They are buried and require a couple hours labor just to access and replace it. Or you can have an injector service performed by a shop. It'l run you 100 bucks give or take and doesnt always fix it. Or you can run some additive strong in the fuel tank and hope for the best. Or if your strapped and have plenty of time you can swap # 2 injector with 3 or so and see if the code follows. This is alot of work but it will rule out an intake gasket issue possibly.

Posted on Nov 18, 2009

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P0302 - Cylinder 2 Misfire Detected,what needs to be done.


Fritz, Clear codes, Plugs and coils try switching them around, not using the same cylinder, to see if code changes to different cylinder. this would help diagnose bad coil or plug. See links below for full instruction. I have had this code come up because of a bad/dirty fuel injector also. Last link tells what other reasons code could be thrown.
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Could be the plug, injector, coil, or crank sensor. Or a mechanical problem such as a stuck valve.

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Hi Julie, i believe the problem on your vehicle will be from the individual ignition coils which fir ontop of each of the spark plugs. Regards John

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1 Answer

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I have a 2002 TrailBlazer with the straight 6,diognostic check said #3 cylinder was dead or misfiring, also map sensor showed up. #3 cylinder was misfiring, so to test the coil pack I swapped #3 coil pack...


did you replace only one spark plug? that can cause issues because of differences in resistances between cylinders. also, did the map code stay off after replacing
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1 Answer

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