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Cylinder 4 miss fire
Error code P0108
Circuite high input

Initially it was giving a different code but after reset its giving p0108. After computer reset It was fine for 2 minutes and again started mis firing.

Compression and fuel pressure 160 psi, 40 psi

Map sensor changed
Coil is tested

Mechanic cannot determine root cause please help.

2,932 Posts
If it only does it after then engine has warmed up, it could also be the coolant temp sensor (which usually doesn't give a code). I would say wiring but if it's working after a reset, i'm guessing pulling the battery terminal to reset the PCM, then I wouldn't think it would automatically fix a wiring problem.

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