Cylinder four misfire

2008 DODGE AVENGER
117,000 MILES • 2.7L • 6 CYL • 2WD • AUTOMATIC
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LEXIMAY31
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I've had a cylinder 4 misfire and cannot find the source. I have replaced the spark plugs, fuel injector and coils. The car also passed a compression test and does not ride rough at all.
Feb 13, 2020 at 1:47 PM
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JACOBANDNICKOLAS
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Hi,

If compression is good, the plug is new, you have a new coil on it and it's working and a new fuel injector, the next thing I would be checking is fuel pressure. Too high or too low can be a cause.

Now, if you could provide a bit of info, it would help me. First, do you have the compression readings from all cylinders? Next, is it only a P0304 code you are getting? Next, do you lave a live data scanner? If you do, can you provide the short and long term fuel trims? Last, have you checked for an engine vacuum leak?

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Let me know as much as you can. I will watch for your reply.

Joe
Feb 13, 2020 at 5:55 PM