Fuel injector test

Tiny
67 MUSTANG
  • MEMBER
  • 1995 BUICK LESABRE
  • 3.8L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 99,500 MILES
Vehicle has good fuel pressure 35 to 45 psi, all 3 coils firing good. Vehicle runs great then after a good hot soak vehicle fails to start. Still has good spark and fuel pressure. I have not checked for injector signal when no start occurs. That's next step. Does computer only have 1 injector driver?
Thursday, January 9th, 2020 AT 9:03 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Did you take the fuel pressure with it running? If so, it is actually a little low according to the spec. It could be the pump causing this but a good way to tell is when it does the no start, don't crank the engine, just cycle the key from off to the run position (one short of the start) so that the fuel pump primes again. This will get the pressure up and if it starts after doing this 3 times then the pump is surely the issue.

If you have a fuel pump gauge then just hook it up and tell me what it is when you key on the first time. The pump should get the pressure to about 50 PSI with one key cycle.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Let me know what you find and we can go from there. Thanks
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Friday, January 10th, 2020 AT 3:47 PM

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