misfire??

10

Asked by Aug 27, 2010 at 01:31 PM about the 2003 Chrysler 300M Special

Question type: Maintenance & Repair

I've got a 2003 Chrysler 300m Special with 97k miles. I have taken it to various mechanics and have paid over $600 in repairs this past month, and the same problem still occurs. On idle, the car shakes as if the engine is misfiring. I have replaced the spark plugs with Bosch Platinum's, new o2 sensor, the computer has been reprogrammed, there was oil in the plug reservoirs so I took it to the dealership and they replaced some gaskets and seals. The car is still running like crap, honestly.
Also, on acceleration, its really boggy until I get up to highway speeds, then it runs fine. Another thing, driving around town I can hear a tick once in awhile as if the computer is resetting or something, I'm not really sure. I think I'm going to replace a coil pack or two because one of the mechanics said their computer was showing misfires because of them. Any help would be greatly appreciated.

3 Answers

10

Found my own post on this just today, the problem the whole time was that the mechanic put in a Bosch o2 sensor, which conflicted with the computer since it wasn't OEM. As a result, an OEM o2 sensor was put in the vehicle, and it runs great now. Hope this helps anyone having a similar problem.

1 people found this helpful.
190

When ever you change spark plugs you should also change the ignition coils and/or wires. If it isn't that you might need a fuel injecting cleaning or use better oil at oil changes.

5

Take your car to a chrysler dealer they know the car best I had same on my 99 300m

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