Question about 2000 Pontiac Grand Am GT

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2001 grand am 2.4L code PO304 cyl 4 misfire detected. what is it?

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This could be that the coil it's self is going bad or you have a crack on the boot part that connects to the spark plug.

Posted on Oct 05, 2009

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Ensure you have the proper spark plugs. Check the coil boots/wires, look for burn marks. Anything beyond that you may have to take it back to the shop.
You are misfiring on all 4 cylinders and it is not spark plugs. Those misfires if not addressed can cause serious engine and/or cat converter damage. There are lots of things that could be causing it and most of them need to be checked out at a shop - unless you want to invest several thousand dollars in the appropriate equipment and training.

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Failed smog check


po304 is just that #4 cyl has a problem could be a bad spark plug or a bad plug wire or bolth
if it hasnt had an ign tuneup its time.
the po138 is just telling you one of the cylinders isnt burning all the fuel put into that cyl.
so its just cause and effect.
if ya need any more info let me know
later paul

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