Question about Chevrolet Silverado 1500

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Thanks for any help. I have a 99 5.3L chevy that i am getting a p0302 misfire code on. I have switched the wire, plug and coil with no change still misfire on #2. When i pull the plug it smells like gas and looks wet.Any help?

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Here is what I would recommend when trying to isoltate this condition. I understand that you already switched some stuff out and the misfire code is still present. I recommend pulling the plug and while leaving it connected to the wire and coil , place the electrode on the cylinder head or good ground source and have somebody turn the engine over while you visually verify that the plug is in fact creating a nice blue spark. The plug could be fuel fouled so have a new plug ready to try as well to make sure you are not mislead. If you have a good spark then I would start suspecting a leaking or possibly even stuck fuel injector for cylinder #2. Creating an overly ricj condition in that cylinder and causing a misfire. Diagnostically speaking you have taken the correct path so I think you got a good beat on it. Hope this was helpful.

Posted on Mar 19, 2011

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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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Have the plugs on those 2 cylinders, and the 2 fuel injectors checked, also check for spark from the coil on those 2 plug wires.

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