Numer 4 misfire
I have a number 4 misfire that won't go away. I have
change all the plugs , ignition coils, fuel injectors, and fuel
filter. Nothing I have done has changed a thing. It has
114,600 miles on it. What can I do to save my car?
try the ignition module next.
Try running a compression test on it. Number 4 may have a valve or piston issue.
There is no Ignition Control Module, the computer controls the delivery of the spark. Like Bob says, check the compression on that cylinder.
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