Question about 1999 Chrysler 300M

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How do you know if you have a bad cylinder

My car shakes at an idle until it reaches 40mph. I was told it;s my #1 cylinder.

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First is the check engine light on ? There may be trouble codes stored in the computer that would help you find the problem.
If the number one cylinder is not producing power, the problem could be ignition, fuel, or mechanical.

Posted on Jan 21, 2013


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You have a spark plug or wire breaking down under pressure.I would have them changed.

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I have a reoccurring problem with a flashing check engine light flashing. the code always indicates an engine misfire. I have replaced all coils, wire set, plugs, O2 sensor and cat. The problem...

You need to know if it IS misfiring. Does it shake at idle?
Typically I recommend experienced techs deal with misfires.
the code should say P030x, with the X being the number of the cylinder it believes is misfiring (No, computers arent always right about which cylinder. USUALLY, but not always.)
Lets assume it says CYLINDER 3. (Only your scanner will tell you for sure, 3 is an example we are using for now). You could try disconnecting cylinder 3 ignition coil plug at idle. On a good cylinder that is NOT misfiring, you will hear and feel the engine run rougher and slow down when you unplug its coil or injector. Thats because it WAS contributing until you unplugged it. Your v6 engine idles at say 600rpm warm when its running good. If you unplug any 1 cylinder, youve lost 1/6 of the engine output (actually more due to dead weight drag from that cylinder, but not important for now). SO, if you find the cylinder it says is misfiring, and it loses rpm when unplugged, its probably doing SOMETHING or trying to. If you unplug it and zero change heard or felt, that cylinder is likely dead.

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Start by figuring out which cylinder. If it idles smooth (No shake at idle, and if you clear code and start it and let it idle the light never comes back till you drive over 75 as you stated), then I strongly recommend a professional check it.
If it idles rough and you know which cylinder, you can try taking out that coil and spark plug if you know how, moving them to another cylinder that isnt misfiring, then clear the code and drive it and see if the same code resets or a new code for the other cylinder sets. If the code is the same, you have deeper issues not worth explaining here.
If the code moves to the new cylinder, then 1 or both of the 2 parts you changed are likely at fault. You can replace them an very likely fix the issue.
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