Question about 2006 Chrysler 300

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Dead cylinder/ misfiring cylinder

I have replaced the ECU, #7 coil, plugs and wires. The car still shakes at idle and under acceleration has no power. The mechanic that I use, now thinks that it could be either a week valve spring or a bent valve. How do I know that these will fix the problem or is it likely that this is just another guess at the problem.

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  • sully_70 Nov 23, 2008

    But if after the compression test is done and is good would the week spring come into the factor if that is the case?

  • sully_70 Nov 24, 2008

    No there was a code that came up saying that cylinder 7 was not working so at that time the impression that was given to me was that it was the ECU because of the ability to switch between 8 cylinders to 4 cylinders. So the job of switching out the ECU was done. The plugs and wires were done at this time. For a short time everything seamed perfect and then bamm, it was back. Next the coil for # 7 cylinder was replaced and the wires and plug for #7 cylinder were also replaced. Now this is were I am. I do not think that the compression test was done and that definately needs to be. i really appreciate your help. Thanks sully

  • sully_70 Nov 24, 2008

    Thanks I will try that



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Wow the first thing should have been a compression check i would not go any further with out doing it should have been done first before changing all those parts if it has good compression then go from there

Posted on Nov 23, 2008

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  • no if it is a weak spring you will have bad compresion on that cylinder did he do a cylinder nock down test to se what cylinder it is?

  • do you have dual exhaust if you do start the car go to the back by the exhaust the side that is missing hold the dollar in both hands like your looking at it put it by the exhaust pipe about a half inch away if the exhaust pipe tries to **** it in and the dollar makes a poping noise you have a sticky exhaust valve

  • As the car is missing have your mechanic unplug fuel injector on the cylinder that is missing. If there is no change in the way it's running, then it has a bad injector.



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