My ‘87 325is CPS sensor shorted out on the drive belt which also knocked out the coil. After replacing coil and CPS only #2 spark plug wire would fire, so I replaced rotor, rotor cap, plug wires and relay switch. I still have the same issue. Today I replaced the ecu and still have only #2 firing, what else should I do.
Thanks.
Only one plug firing
Moderator: martauto
