Backfires

1994 CHEVROLET TRUCK
197,000 MILES • 5.7L • V8 • 4WD • AUTOMATIC
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MIKE LESLIE
  • MEMBER
  • 1 POST
First crank it up .it runs fine. Seems like the more you drive it.or hotter it gets.it starts to idle ruff in gear.then losses power.causing you to give more throttle.then pops and sputters.eventually backfiring out tailpipe
Aug 30, 2017 at 10:48 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,583 POSTS
It sounds like you are losing the fuel pump. Lets start by checking the fuel pressure. Here is a guide to help us get started. If you do not have a fuel pressure gauge you can rent one for free at the auto parts store.

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

and

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

and

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Please let us know what you find.

Cheers, Ken
Aug 31, 2017 at 3:15 AM
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