Misfires and loss of engine power

2000 CHEVROLET TAHOE
171,000 MILES • 5.7L • V8 • 4WD • AUTOMATIC
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CYNTHIAK84
  • MEMBER
  • 1 POST
I have the vehicle listed above z71 and it is backfiring while driving and stopped. just recently replaced fuel pump and lines, CV axles, ball joints, and tie rods. I didn't drive it for a week or two and now it is backfiring.
Nov 9, 2021 at 5:09 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
Hi,

A backfire can be caused by a rich or lean fuel mixture. Have you checked the fuel pressure since the repair to confirm it is within the manufacturer's specs? If not, first do a visual inspection for vacuum hoses disconnected or damaged, and then check fuel pressure.

Here are three links you may find helpful. The first discusses the most common causes of a backfire. The next two are to help find a vacuum leak and check fuel pressure.

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

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

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

Also, make sure nothing electrical such as a mass air flow sensor was left disconnected and the air inlet tube between the air box and the throttle body is tight and fully in place.

Let me know.

Joe
Nov 9, 2021 at 12:09 PM
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