Backfires/ popping

Tiny
BOYDEN
  • MEMBER
  • 1988 GMC SUBURBAN
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 260,000 MILES
When I accelerate there is a popping sound coming from the Muffler? It only does it when I accelerate? What can cause this?
Wednesday, August 17th, 2016 AT 8:27 PM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check for a bad valve meaning engine compression all cylinders and look for a bent pushrod or broken rocker arm after you short out cylinders by removing plug wire to find which one it is.
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Thursday, August 18th, 2016 AT 6:28 AM

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