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Cheers, this was super helpful. I would never had thought to check the grounding of the igniter.
Had one that was showing E 09-1 on a 8FGU25. Traced wiring, found all good. No spark to plugs. Found a loose mounting bolt on the igniter (just below the battery). Fired right off. Must need a good ground to fire.
What did the dealer say was wrong with the first truck? You may a harness issue. Some of those trucks had the harness rubbing by the fuse box and wires were grounding out causing erratic codes.
I have another one this morning with this error but it runs. The engine light is on and wrench is flashing. Driver on third shift says it shut off a few times. Looks like the dealer will be back yet again.
check the 2 wires at the distributor. One is power and the other is a signal wire. I bet one is broken.
Error means ignition signal error ,unstable engine speed
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