P0304 code [Archive] - GrandAmGT.com Forum

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Ground Hugger
07-15-2012, 12:12 PM
OK I have a misfire on cylinder #4 and my OBD2 gives me the P0304 code for it. That's the only code I get. Would this be a defective fuel injector or could it be a bad cable? I want to make sure I'm prepared for any situation. The misfire happens upon acceleration. My problems staterd after replacing the upper manifold gasket. I have already removed the upper manifold once and double checked the connections and everything was connected as it should be. Any thoughts? Engine is 6 cylinder 3.4L.

HOYS
07-15-2012, 02:13 PM
Check spark.

Ground Hugger
07-15-2012, 03:02 PM
OK will check

Ground Hugger
07-15-2012, 03:52 PM
OK removed plug from #4 cylinder and it was broke in half in the spark plug socket. I was careful taking it out so I know I did not damage it doing so. Replaced it with another plug. I took the car out and booted it to get it into overdrive. did this a number of times. No more hesitation or misfire from it. I have cleared the code and now we will see if it starts acting up. Thanks for the suggestion.