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Backfires when I accelerate full throttle?

Tiny
REGINALD DANCY
  • MEMBER
  • 2005 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 198,008 MILES
My truck starting backfiring when I get on the gas pretty hard. Doesn’t do it at idle and doesn’t do it when driving normal just when I get on the gas real heavy. What could be the problem?
Wednesday, April 15th, 2020 AT 2:20 AM

1 Reply

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

This is usually a result of a worn camshaft or lifter not moving the valves enough for producing power.

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

I would remove the valve covers and insect the movement of the rocker arms while cranking to see if there are any that are not moving the full distance.

Roy
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Wednesday, April 15th, 2020 AT 3:54 AM

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