brandon1996mustang

We believe its either a ground issue or a ecm issue. I need common ground break areas in order to verify if its a ground or ecm. Checked the wires and replaced the coil pack on the drivers side. the left two are still not firing. Checked the spark plug and spark plug wires and they are fine. we took it to get the codes and the were all indications of misfiring...the codes were po351,353,354,304,307. please help.

devongarver

Well, I cannot find a wiring diagram for anything other than plug wires and the coil packs. However, that being said, I believe you have a misfire in cylinders 1, 3, 4 by the codes right? So, if you replaced the driver's side coil pack, you replaced the pack feeding 2,4,7,8. 1,3,5,6 are on the passenger side. I would replace that coil pack as well before you do anything else. Unless I am mistaken and you replaced both coil packs. In which case, you should check the ground strap on PCM itself, otherwise it could be the actual driver circuit in the PCM failing.

brandon1996mustang

can you tell me where the pcm is located? ..I replaced both coil packs ..thanks.

WhiteFoxGT

The pcm is under the passenger kick panel (if you were sitting in the passenger seat it would be on the side of your right foot)

Now Im going off a hunch here, but I just worked on a 94 buick 3.8 and 2 of the 3 coil packs were firing, and the last pack got intermittent spark every so often. Turns out to be a bad crank sensor. I no longer have access to my ford tools so I cannot search for you in depth. sorry