Question about 2003 Chevrolet Malibu

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Code p303 2003 malibu 3.1 misfiring #3cyl. swapped plugs and wires still misfire. good spark at plug end of wire so to me eliminates coil pack.any help would be appreciated

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  • crazyeddie52 Jan 25, 2009

    code was cleared and returned after swapping plugs and wires.pulled plug wire and #3 definetly not firing

  • Rick Byrd
    Rick Byrd May 11, 2010

    excellent elimination of #3 problem , however , did you clear the code and it returned as P0303 ? have you verified it was #3 in the first place ? if you are misfiring at idle , pull each wire one at a time just enough to see if there is a difference when spark is removed from that cylinder , to verify problem cylinder , CAUTION , you don't want to do the 80KV shuffle while holding a spark plug wire , so be careful , lol , if indeed the #3 cylinder is the one , look for vacuum leak that might effect that cylinder , any vacuum ports on that intake runner . possible injector issue , or mechanical issue , don't care for later 2 , good luck .

    J5


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  • 1,011 Answers

Very common problem two things either the injector on that cylinder is bad or the fuel rail need clean out with injection clean a good shop can clean them.

Posted on Jan 25, 2009

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