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1986 Other Chevrolet Models Backfiring

Tiny
COACHLUBBAS
  • MEMBER
  • 1986 CHEVROLET
  • V8
  • 2WD
  • AUTOMATIC
  • 29,000 MILES
I have an 86 Pace Arrow Motor Home. It backfires when I step on the gas to take off. It idles fine and turns off promptly when I turn the key off. Also it doesn't start backfiring it seems till it warms all the way up. What is the likely cause?
Monday, March 2nd, 2009 AT 7:08 PM

5 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Timing problem, either in the distributor(my first stop) or the chain. Check for sideplay in the distribtor by removing the cap, and wiggling the shaft. Is the mileage 29,000 as you wrote or 290,000?
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Monday, March 2nd, 2009 AT 7:55 PM
Tiny
COACHLUBBAS
  • MEMBER
  • 3 POSTS
The mileage is only 29000.
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Tuesday, March 3rd, 2009 AT 2:08 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
OK even a cracked distributor cap can cause this. Start it in the dark and look for arcing.
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Tuesday, March 3rd, 2009 AT 7:17 PM
Tiny
COACHLUBBAS
  • MEMBER
  • 3 POSTS
I will look into this now I appreciate it. A friend thought backfiring meant a valve job.
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Wednesday, March 4th, 2009 AT 9:47 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
A simple compression test can tell you that, but with only 29,000 on it I doubt it...
https://www.2carpros.com/dia/how_to_check_compression.htm
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Thursday, March 5th, 2009 AT 11:29 PM

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