Thread: Misfire in cylinder 3 ... need help identifying unplugged wire

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  1. #1 Misfire in cylinder 3 ... need help identifying unplugged wire 
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    I have a 2002 Pontiac Grand Prix GTP that is receiving code P300 - Misfire in Cylinder 3. I have changed the spark plugs and Wires, and I've checked the coils, crank sensors and ignition module... which are working fine however i am still receiving a misfire in cylinder 3. I bought the car used an the previous owner did a hack job under the hood and left wires unplugged so I'm trying to figure out if one particular wire could be the reason why I am receiving code P300.

    I have attached a photo of the unplugged wire in hopes that a member can help me out in identifying where the wire should be plugged.


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  2. #2 Re: Misfire in cylinder 3 ... need help identifying unplugged wire 
    Killa Bee Scottydoggs's Avatar
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    we all got unused plugs under the hood, its normal.

    try swapping #3 injector with 1 or 5, your looking for the miss to move.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  3. #3 Re: Misfire in cylinder 3 ... need help identifying unplugged wire 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Check compression while you are at it.

    SMGPFC Member #1
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  4. #4 Re: Misfire in cylinder 3 ... need help identifying unplugged wire 
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    Tune-up replace the plugs and wires and use acdelco parts
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