Engine stops it will just stop with no warning

REEDGERRYLEE

MEMBER
1987 FORD F-150
V8
FWD
AUTOMATIC
300,000 MILES

The truck runs pefectly for 100 miles then it will just stop with no warning. No sputter just engine stops. We've checked fluids, gas, change fuel filter, checked ignition modual. Two mechanics say there is nothing wrong with it. This truck has sat for a long time with very little driving but well maintained. Electrical glitch in ignition has been there for a long time & truck has always run. This truck also has two gas tanks & a hose running from the air cleaner into the engine?

6 Replies

RACEFAN966

MECHANIC
5,029 POSTS

OK I am thinking ignition module or coil. Now what I would like you to do next time it stalls is unplug a spark plug wire from a spark plug and put a screw driver in the end set it next to the valve cover or other metal and crank it over, let me know if there is spark. If there is no spark then I would replace the ignition module. Unless it is on the distributor here is what it should look like.

Module.

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Monday, April 26th, 2021 AT 6:00 PM

REEDGERRYLEE

MEMBER
4 POSTS

We are in the middle of the biggest snow storm ever. I'm in PA the truck is in WV I will try this when I can. Thank you so much for your help.

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Monday, April 26th, 2021 AT 6:00 PM

RACEFAN966

MECHANIC
5,029 POSTS

No problems let me know how it goes when you get to it. As for snow I know I am in Northern Idaho and it usually us that gets it but not this year.

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Monday, April 26th, 2021 AT 6:00 PM

REEDGERRYLEE

MEMBER
4 POSTS

The shop called & told me that there is a slight leak in the fuel pump. Would this cause the stalling problem? The engine just stops, would an air bubble cause this? How do I know if it needs new plug wires?

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Monday, April 26th, 2021 AT 6:00 PM

RACEFAN966

MECHANIC
5,029 POSTS

I still think it will be the module. As for a fuel pump causing this no it won't. The only way a fuel pump can cause an engine to die is to go bad and it won't start back up no matter how much time you give it or the fuel line crackes before the pump and it draws air through the line instead of fuel. Now for you plug wires question ohm them out and give the ohms and length of wire and I will check that for you.