Ok so I've just purchased ny first ever pair of mustangs one being a V6 convertible 5 speed and the other a 4.6 5 speed GT car. I got both of these for 700 combined and drove them home and I knew about this issue with the GT but was told it was a PCM issue. Well I found a local deal got a cluster pcm ignition keys and the plastic transponder around the ignition for 150$ but it still didn't fix my issue. I've tried swapping coils around checked all my spark plugs and even swapped them around but the issue persists and didn't change cylinders. I do know the previous owner put a new engine harness on it and it all seems fine so I'm really not sure what would make these cylinders not fire. I have injector pulse on the cylinders and 12v to the coil packs but no pcm pulse to the coils anyone seen this before? CEL Codes are p0354, p0355, p0356, p0358, p0135, p0155, p0141, p0161, p1131, p1151. I do know 4 of those are for 02 sensors and that's because the exhaust is missing its just on manifolds I do know it will run better with exhaust eventually but I'd like it to actually be firing on on 8 cylinders first any help would be great thank you also I have checked all my grounds.
Multiple coils not firing
- Thread starter 02gt350$
- Start date
07GtS197
Well-Known Member
What year? If it’s not a mechanical fault, I’d wager on the coil drivers in the ecu being faulty. Since they all have 12v then it would be on the negative side of the circuit, which is through the ecu.
ttocs
Forum's #1 poster
trace the wiring and look for shorts or bare copper areas.
Well the thing is I've replaces that already with a known good part
Which harness would I do that on?
They're both 02's
07GtS197
Well-Known Member
The injector/coil harness. You can follow it from the coils up to the rear passenger side of the engine bay. It’s the large harness that has a bolt to hold the connectors together.
Have you ruled out a mechanical fault like a dead cylinder?
Have you ruled out a mechanical fault like a dead cylinder?
ttocs
Forum's #1 poster
and it isn't always a bad idea to do this while the motor is running. If you happen to find the spot that is causing the problem you can see/hear the engine react to it and it makes it can make it easier to find. Now I say that isn't ALWAYS bad because you can give yourself a little bit of a shock if the plug wires are bad and you find the bad spot. Nothing terminal, it will just wake you up and make ya curse a bit I mean they are only electrons and they are really really small.
Well the thing is I know it has a good motor it was buddies car and I helped him swap the motor cause the previous one apparently always did this on the same exact cylinders and we did a compression test before buying the motor the thing is we used the harness from the new motor and didn't reuse the old one it's pretty unlikely to me it would have the same exact problems on the same cylinders with a different engine harness it's honestly making me debate just flipping the thing or parting it out cause I'm not in the market for another project I got it cause it was cheap
Well I did that it's just odd that the coils have 12v and the injectors are firing but they aren't getting the pcm ground could it possibly be the other harness like the fuse box one ik this one is in piss poor shape and I found one local for 100
ttocs
Forum's #1 poster
you swapped the motor harness, but have you checked the harness going to the ecu to the motor harness? If both motors did it on the same cylinders I am inclined to think that it isn't the motors but something to do with the car.
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