MIND BENDER
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Freshman User
Joined: Aug 2009
Posts: 41
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From: Arizona
MIND BENDER
My 97'HD has a new 7.5L w/850 miles, the truck has 92,000. It will die (engine shuts off) just like you turned off the key when I'm headed down the road. Put it in neutral and coast to a stop and put it in park, hit the key and it fires, drive on until it happens again, 1 day or 5 days WHO KNOWS WHEN? Not to mention how unsafe this is in traffic it's also making me crazzzy. My repair shop has spent many hours testing and driving it but has not had it stop on them. I replaced the coil now I'm gonna do the ignition switch. I could explain as much as anyone wants to hear but I'm hoping some one out there has a possible answer. When I say they tested it they tested fuel system too. It won't stumble any, it just quits clean, all other systems are working(heater, radio, lights etc.). This never happened before the new engine install. At a loss. DOOG
Cargo Master
Joined: Mar 2007
Posts: 2,935
Likes: 34
From: Arcadia, Fla
My 97'HD has a new 7.5L w/850 miles, the truck has 92,000. It will die (engine shuts off) just like you turned off the key when I'm headed down the road. Put it in neutral and coast to a stop and put it in park, hit the key and it fires, drive on until it happens again, 1 day or 5 days WHO KNOWS WHEN?
I had this happen on my 89 F250, random shut down, always restarted and never could get it to act up. This went on almost a year till it finally "hard" faulted and I was able to locate the problem.
The ECU power relay was going bad. The contacts in side it were failing and when the relay cycled they made contact again for day or weeks then would fail.
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