Thread: P0340 Cylinder 4 misfire.

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  1. #1 P0340 Cylinder 4 misfire. 
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    Okay, let me go through the whole thing as quick as I can..

    I don't get a miss at idle, just when I give it gas.. usually it's the worst at 1/2-3/4 throttle.. doesn't miss as much at WOT but still misses.

    Replaced plugs, wires, coil pack.

    Had the ICM tested 3 times, passed every time.

    Took the injectors out and moved a few around, still a misfire in cylinder 4, it didn't move with the injector.

    Swapped PCM's.. no change at all.

    No other codes are present.

    any hints on what could be causing cylinder 4 to misfire? or any tests I should run? The next thing I'm going to do is a compression check. But I'm stuck and could use some help. Thanks in advance.
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  2. #2 Re: P0340 Cylinder 4 misfire. 
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    lol ok well kinda funny.. the new spark plug wire i had on there.. was bad. fixed.
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