Thread: grand prix misfire

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  1. #1 grand prix misfire 
    patrick 721
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    Default 11-28-2012
    i have 1997 pont gran prix gtp 3.8l supercharged and i have misfires on number 3 and 4 cylinders are yhere any known problems with this concern
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  2. #2 Re: grand prix misfire 
    Fivefingerdeathpunch
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    Default 11-28-2012
    Figure out why its misfiring.

    Ever done plugs and wires?

    Any mods?

    Possible bad coil pack, you can swap them around and see if it follows.

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  3. #3 Re: grand prix misfire 
    Scottydoggs
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    Default 11-28-2012
    whens the last time you did a tune up? plugs and wires?

    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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  4. #4 Re: grand prix misfire 
    Slick2500
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    Default 11-28-2012
    Vac leak, bad O2 sensor/s, plugged fuel filter, bad cat, bad/leaky egr, plugs, wires, coils, fuel injectors, chipped pistons.
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
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    Superchargers take away horsepower
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