351m problem

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Apr 22, 2004 | 09:01 AM

tinman213

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351m problem

Hello everyone. I have a problem and I'm not sure if this is the right forum or not. I have a 1979 F150 with a 351M. when the engine is cold it starts right up
and runs great. when the engine gets hot (about 20 minutes) it shuts down just
like I turned the key off. then it will not re-start untill it cools back down. It apears that the electrical system shuts down but I dont know. my manuals are
not much help and I really dont want to take it to the shop. any advise would be great
Thanks
Paul

Apr 22, 2004 | 09:11 AM

fmc400

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Joined: Apr 2004

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From: Austin, TX

My first guess would be the plug wires aren't routed well, maybe they're resting on the manifold.

Apr 22, 2004 | 09:19 AM

fmc400

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Joined: Apr 2004

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From: Austin, TX

Another likely thing to look at is the ignition module - might be on the inside of the fender. They're known to fail when they get hot.

Apr 22, 2004 | 10:04 AM

ddfunnyfarm

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Joined: May 2003

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From: Fernandina Beach, FL

Here is another vote for the ignition module. Another possiblity could be the pick-up coil.
Good luck and let us know.

-Di

Apr 22, 2004 | 10:55 AM

tinman213

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I did change the module, plug wires are fine, and it still does it. Thanks for the input. Any other suggestions?

Apr 22, 2004 | 11:08 AM

Brian77Ford

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From: Butler

Check the horseshoe looking part that goes on the coil.My truck did the same thing.I was trying everything and nothing worked.I wilgled this piece,and vavoom,it started right up.That part is a dealer or junkyard part only.It cost $9.00 but worth every penny because it worked.Just a thuoght.

Apr 22, 2004 | 11:50 AM

fmc400

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Joined: Apr 2004

Posts: 10,386

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From: Austin, TX

Might as well check over the entire coil while you're at it. Maybe it's getting too hot and can't hold the current.

Whatever the case is, it sounds like it's a complete cut off of electricity, rather than something slowly losing power. You said your engine shuts right off like you turned the key off, rather than the engine missing or sputtering until it kills.

Might end up havin to go through the whole engine electrical. =(