Question about 2002 GMC Sonoma Extended Cab

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Code 304 won't clear new plug wirea,new coils 2002 4cyl sanoma

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Code 304 is a cylinder #4 misfire. After changing plugs did you clear your code by removing the negative battery terminal for a few moments and then re-connect. Also if the code returns check your cyl #4 wire for degradtion.

Posted on Feb 19, 2009

  • Patrick McGee
    Patrick McGee Feb 19, 2009

    Also remove the plug in #4 cylinder and check for spark or replace.



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I have a 1996 ford contour i get the 304 code mice fire on cyl 4. i changed the plugs and the coil and they wires look good but the car is still sputtering and it back fired once. any ideas?

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Hello i have a GTI its a 2.0L manual transmission, i have been having problem after problem thus far. Current engine codes PO422, PO300,PO304,PO303,PO302. I do not have a code list to see what these are...

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ck if you have spark at the coil for that cylinder. check the plug wire closely. if it has spark at the coil, then replace all the spark plug wires.

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