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Try and start the engine there was a small "backfire" the engine won't start

Tiny
PDXSCOTT
  • MEMBER
  • 1996 CHEVROLET TAHOE
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 220,000 MILES
After using some starting fluid to try and start the engine there was a small "backfire" the engine won't start. At the same I lost power to my fuel pump. Now even with an alternate power source to the fuel pump the engine still will not start. What should I do next?
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Tuesday, April 21st, 2020 AT 4:27 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

Is the check engine light on? If it is, do you know the code?

If it backfired, you have spark, just at the wrong time.

https://www.2carpros.com/articles/engine-backfires-while-running

I would start with checking the compression to be sure the timing chain has not jumped.

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

Do you hear the fuel pump run for 2 seconds with the key on? Can you test the pressure?

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

I attached a wiring diagram of the fuel system for you. Do you have a test light or voltmeter to do some testing?

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Roy
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Tuesday, May 4th, 2021 AT 12:42 PM

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