Quote:
Originally Posted by blue62
All true if you have a bad plug or bad coil.
You could also have a coil wiring issue on cylinder #4
You could also have a fuel injector issue or injector wiring issue on cylinder #4
Or valve train issues on cylinder #4 ect.ect.ect.
And get the same #4 cylinder misfire code.
My point to the OP was there is no CEL or OBDII codes that tell you a coil is faulty.
Misfire codes are triggered for many reasons depending on frequency and severity of the misfire.
The reason for the misfire as you pointed out has to be determined by diagnostics.
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OK I stand corrected but coil failure is still easily diagnosed with the CEL code for misfiring. Intermittent failure/ misfiring can be felt, if it does not trigger CEL. Ilm still skeptical if ‘weak’ spark from an aged coil can appreciably reduce engine power, and if so what characteristics one can check on a coil and justify replacement.
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