I have a crank no start condition. EFI system?

1991 FORD BRONCO
300,000 MILES • 5.8L • V8 • 4WD • AUTOMATIC
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WOODONE1
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  • 1 POST
I have a crank no start condition. EFI system. The motor may occasionally try to start but only for a second then die. I have spark at all cylinders. The pump relay is turning on the pump and I've replaced the fuel filter. I checked the fuel pressure and notice the pressure very slowly rising to 35 psi instead of rising quickly. I determined it was a weak fuel pump. Replacing the pump did not fix the problem. Next, I replaced the fuel pressure regulator. This did not work.
Jan 24, 2015 at 11:53 AM
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HMAC300
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  • 48,601 POSTS
fuel pressure shold be 35-45 with key on engine off an d30-45 engine running at idle. scan for codes. check dist cap for cracks and carbon tracing
Jan 25, 2015 at 12:39 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,554 POSTS
With 300k you might have a low compression issue. I would check the compression which will tell you if the timing chain has jumped. Here is a guide to help you with the test.

https://www.2carpros.com/articles/how-to-test-engine-compression

Please go over this guide and get back to us.
Sep 12, 2024 at 11:10 AM
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