How do I reset the PCM to reconize this change. the neg. battery cable was off for more than 24hrs. When I cranked it up the failsafe symbol and check engine light is on and the car will not go past 5 mph, pressing on the gas does nothing, it doesn't even raise the engine.
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2005 Lincoln LS Question: I had my spark plugs, 2 ignition coils and the fuel filter changed out.
Answer #1cglrcng April 30, 2013, 17:17Rookie
My feeling is somewhere there are (at least), 2 spark plug wires crossed up when the new wires were reconnected to the new coil(s). Had an outboard motor did the same thing after a professional rebuild and that thing wouldn't go above 2500 RPM, sorted that out and got the firing order (right wires on right coil tower), corrected by tracing each wire and bam, 5600 RPM immediately and there was real life in the engine. Any Auto Zone can clear codes free for you and reset the PCM using their code reader. But, trace those wires from coils to plug first and compare to a correct year/make/model/engine wiring diagram first. Also check the coil pack harness connection and make sure that all the coils are getting power or use an electrical test light or timing light to make sure that each wire is firing properly and in the proper sequence.
Answer #2pushrod April 30, 2013, 18:21Master
(Coil on plug ignition system no wires) Ok, any warranty on that repair job and did it run ok right after? Needs a good scanner hooked to it!