Question about 2002 Mitsubishi Lancer

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Engine misfires with new coils,plugs,wires ? - 2002 Mitsubishi Lancer

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  • Wayne Pennington
    Wayne Pennington May 11, 2010

    Do not get ticked at me, but this is a common shop problem. Are you positive you did not cross a spark plug wire? Sometimes when replacing plugs, wires, coils, you get a wire on the wrong cylinder. If this is not the case you could have a plugged or bad fuel injector. But check your firing order first!

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Run a compression test on all cylinders to see if you have a blown head gasket, burnt valve, or other problem.

Posted on Sep 25, 2009

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Miss fire at cylinder 6 on my 2004 grand am 3.4 i have replaced new plug new coil and wire whats next still miss fires


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If an engine is hard to start or has a misfire at higher speeds, the problem may be a weak coil, a bad plug wire, or a fouled or worn spark plug. On 1996 and newer vehicles, you should get a cylinder misfire code. A code for one cylinder would likely indicate a fouled plug, bad plug wire, or possibly a clogged or dead fuel injector, or a compression leak (burned exhaust valve). Misfire codes for two cylinders that share a coil would likely point to a bad coil.
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They are still looking for a cause because it isnt misfiring right now or because they cant find the cause of the stored misfire codes ?
If it is misfiring right now and they cant figure it out then perhaps you should find new mechanics !
I have seen a lot of bad coils on the PT.
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Here is a diagram of the firing order for you 3800 engine. Cylinders 1 and 4 are misfiring because the operate under the same "Coil Pack" and the coil pack has unfortunately gone bad. O'Reilly sells them for between $30-50 depending on the amount of warranty coverage you want. To replace, simply unscrew the screws that hold the coil pack in place. WAIT before unplugging the plug wires. Place the old coil pack and new coil pack next to each other, unplug one plug wire, then plug it to that same port on the new coil pack. then do the same for the other plug wire. Then screw your new coil pack in place, and start you car. should run fine!

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