Multiple blown ignition coils on 08
05-18-2023, 12:55 PM
#21
JK Junkie
Edit added to above: I'm expecting pin 4, wire K17, will show a low resistance to ground -- which would draw some amount of continuous current through coil #2. But it probably is, or was, an intermittent fault. And when it happens it miss-fires initially, then burns up the coil from too much continuous current. If this is correct (and that's a big if), it points to wiring (K17) that's grounding or a bad PCM. Disconnect C2 at the PCM to isolate the PCM from the wiring and re-check resistance.
05-18-2023, 02:04 PM
#22
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Edit added to above: I'm expecting pin 4, wire K17, will show a low resistance to ground -- which would draw some amount of continuous current through coil #2. But it probably is, or was, an intermittent fault. And when it happens it miss-fires initially, then burns up the coil from too much continuous current. If this is correct (and that's a big if), it points to wiring (K17) that's grounding or a bad PCM. Disconnect C2 at the PCM to isolate the PCM from the wiring and re-check resistance.
It isn't showing it connected to ground and I get no reading when I go from pin 4 to frame, I'm going to plug in my PCM and try again
05-18-2023, 02:16 PM
#23
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Yea plugged everything back in and still the same no connection to ground from pin 4 regardless of the PCM being plugged in...
05-18-2023, 02:56 PM
#24
JK Junkie
05-18-2023, 03:01 PM
#25
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The fault is probably intermittent, which makes troubleshooting miserable. If the wiring looks good, no critters chewing away, the PCM looks like a good bet. I'm still thinking the coil #2 is overheating after a time of continous current, which initially causes miss-fires. That's the best I can come up with from here...
05-18-2023, 03:33 PM
#26
JK Junkie
yea looks good I mean anything is possible I’ve found droppings in there before but I pulled most the harness out and inspected it, it has no connection to ground honestly hoping it’s a pcm I’m ordering a reflashed one from flagship 1 then I’m going to send my current one in to the pcm medic guys for a rebuild to have a backup pcm, first drive is going to be to get a spare coil as well
05-18-2023, 03:37 PM
#27
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Will do and I don't expect alot from their PCM just has to last long enough to get my stock one repaired.... I've used flagship before for a rover HSE tipm, was an ok experience but I've heard mixed reviews for the Mopar pcms so I'm keeping my expectations low and praying they surprise me there is ares technologies PCMs as well but they have no reviews and I feel like mixed is better then none
