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|Engine Forum Discuss about engine mods, swaps, exhaust, ECU tuning & forced induction here|
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I have been getting P0301 (cylinder 1 misfire) occasionally, but after resetting the code it goes away for a few months.
The dealer suggested replacing the coil (considering the engine itself is a new long block, with new plugs, injectors, etc), which I did.
Now, monitoring OBD mode $06, I can see that I still have misfires on cylinder 1 (example, last trip of 20km had 122 misfires).
Everything seems to point to a harness problem, so I will try to disconnect the ECM, run some contact cleaner, and see if it improves / fixes the problem. Any other ideas / suggestions?