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I have a crank no start condition. EFI system?

Tiny
WOODONE1
  • MEMBER
  • 1991 FORD BRONCO
  • 5.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 300,000 MILES
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.
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Saturday, January 24th, 2015 AT 7:53 PM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 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
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Sunday, January 25th, 2015 AT 8:39 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 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.
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Thursday, September 12th, 2024 AT 6:10 PM

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