memoniz

Maybe I should rephrase my comment. According to the Haynes book, power is coming from the ignition to the coil. The ICM and ECM tells the coil when to fire, I think. In any case, I have found that the ICM is a usual culprit when it comes to firing issues. They don't seem to be made that well. I would test your ICM and eliminate that from the equation. It is also important to have that gel when you get your ICM on well. Don't know what it does exactly but I think it helps pick up some kind of signal in the distributor.

dacfan

I agree. I've had ICM issues multiple times but I replaced the ICm and PIP three months ago on this truck.
The thermal gel is for heat dissipation. Heat is what destroys these modules and the gel helps in using the distributor as a heat sink to draw the heat out of the module. I am a broadcast engineer so I use thermal gel liberally on lots of equipment that mounts much like the ICM on a Ford truck.
Can a ICM go bad that quickly? The truck probably has 150 miles on it since the replacement. We mostly just use it to haul stuff from one pice of property to another a few miles away.

bobbybob

A guy at work had a similar issue and found that one of his harness wires had worn its insulation and was shorting out. I think his problem was one of the wires going to the coil. You could try checking the wire resistance while moving the harness around to see if you catch a short.

pon55

Most of what I've fixes were broken wire (rare) or bad/broken ground.

dacfan

I drove it all over the yard and pastures for about a half hour saturday. Got it good and hot, wiggled and played with the ignition switch, unplugged and moved the wiring harness and connector to the ICM all around and the thing never cut off. Put it on the road and about a mile and half down the highway she shut off again.
So far:
ICM and PIP are 3 months old.
Wiring all looks good
Ground points are all good
Switch isn't causing shutdown
No stored or current codes
Sometime this week I'm putting my pressure guage on the fuel rail and running it up to the windshield. I'm going to tie down the hood and hit the road. I'm thinking at this point it has to be fuel pressure. It's great at idle and revving but I haven't tested it at highway speed. If I never loose fuel pressure it's time for an exorcism.

olddog45

I has a similar thing happen to my civic, engine would run fine at low speeds but would cut off if I went over fifty mph.
Turned out to be a clogged fuel filter.

Hope this helps

OD45