Engine wont start

AUTOWOLF80

MEMBER
1990 FORD F-150
6 CYL
2WD
AUTOMATIC
135,000 MILES

The engine will start, but immediately dies. Have spark and fuel pump runs for a couple secs then stops like it should. Changed fuel filter and fuel pump relay thinking that may have been the problem. Still the same issues. It's got a distributor if that matters. Would inertia switch cause this?

4 Replies

JACOBANDNICKOLAS

MECHANIC
109,740 POSTS

This sounds like the crankshaft angle sensor or the fuel pump has gone out, when you turn the key to the on position without cranking the engine over can you hear the fuel pump run in the tank for 5 seconds? These guides should help us fix it.

https://youtu.be/dCjmRL3p4Cs

and

https://www.2carpros.com/articles/car-cranks-but-wont-start

Please run down these guides and report back.

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Monday, May 31st, 2021 AT 12:47 PM

AUTOWOLF80

MEMBER
4 POSTS

Pressure tested today primed at let to run position at 38 psi. It started today and runs. Tried to die twice. With truck running pressure is at 48 psi and spikes to 56 psi when revved up. Thinking it was bad gas or water in the tank?

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Monday, May 31st, 2021 AT 12:47 PM

AUTOWOLF80

MEMBER
4 POSTS

Guess I was wrong. It was a plugged cat. I cut a good size hole front of it and it started and runs like it used too. Idles at a lower rpm than before. I hope its straightened out now. Guess it time to run some new pipes.

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Monday, May 31st, 2021 AT 12:47 PM

JACOBANDNICKOLAS

MECHANIC
109,740 POSTS

I'm glad you found it. I was starting to get lost because everything was checking out good. Regardless, take care and let us know if you have questions in the future.

Joe

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Monday, May 31st, 2021 AT 12:47 PM