Thread: Misfire on cylinder 3 and 4

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  1. #1 Misfire on cylinder 3 and 4 
    bhuyser
    bhuyser is offline
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    Default 09-08-2011
    Anybody have trouble with a 2004 supercharged grand prix with a misfire in cylinder 3 and 4. Especially under heavy load with pedal 3/4 to all the way down.

    Check engine light is blinking. Both spark plugs showing misfire.

    The catalytic converter does need to be replaced.

    Compression is good.

    You can tell a little rough miss during idle but no codes during idle.

    Anybody have this trouble before?
    Last edited by RamairGTP2; 09-08-2011 at 01:32 PM.
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