Thread: Engine Misfiring oddly

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  1. #1 Engine Misfiring oddly 
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    So yesterday i replaced a bunch of parts on my car. I put in 2 new O2 sensors, a new cat, new plugs and wires, and a new cylinder 1/4 coil pack. After I replaced those I seem to be having some major issues with my engine misfiring. I had a cylinder 4 misfire before which is why i replaced the coil pack. But now whenever I start the car up it sputters alot and whenever i give it gas it will take off, but then immediatly bog down. so its like a constant push and pull when i drive. I had a few codes that i deleted and I drove around for about 20 minutes and i havent gotten any more codes since. Is there anything you guys can think of that could be wrong with it?
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  2. #2 Re: Engine Misfiring oddly 
    GrandPrix Junkie
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    Yes. The wires could be in the wrong order. It happens a lot on these cars for some reason. Double and TRIPLE check the firing order. Cylinders 1 3 5 are in the front from left to right, and 2 4 6 are in the back from left to right (left to right as you are standing in front of the bumper).

    Other than that could be a bad ICM, bad wiring harness, or cracked spark plug. Also, what type/brand of spark plug did you install? Hopefully either a copper or stock irridium plug and NO platinums...
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  3. #3 Re: Engine Misfiring oddly 
    Killa Bee Scottydoggs's Avatar
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    sounds like you got the wires crossed up maybe.


    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: Engine Misfiring oddly 
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    turned out to be a cracked plug on cylinder 6. thanks for the help!!!!
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  5. #5 Re: Engine Misfiring oddly 
    Killa Bee Scottydoggs's Avatar
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    that will do it. nice job double checking stuff.

    cracked plugs happen sometimes. if you dont have a socket with a foam insert get one, it holds the plug firm in the socket, so it has less of a chance of cracking.

    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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