Thread: P0300 Code help needed

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  1. #1 P0300 Code help needed 
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    I am trying to fix my friends mothers 08 GP with the series 3 3.8L. Getting a P0300 General misfire code. Checked plugs and wires, even to the point of disconnecting plug wires one at a time and the engine runs the same. Definitely missing at idle, smooths out at higher revs, definitely down on power and mileage, I believe it is running in "safe mode". Replaced all 6 injectors, since that seems to be a pretty common problem, I also read a TSB for that model year about a problem with the injectors getting plugged up. Car does run a bit smoother but still missing. Any help would be greatly appreciated. Thanks in advance!!
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  2. #2 Re: P0300 Code help needed 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Get a live data scan tool on it. See exactly what cylinders are misfiring and fix the issue from there.

    Could be the spark plugs, could be a dying coil pack or the ignition control module under the coils.

    SMGPFC Member #1
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  3. #3 Re: P0300 Code help needed 
    Killa Bee Scottydoggs's Avatar
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    high miles? clogged cat is possible.

    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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