backfires

1993 GMC SAFARI
200,000 MILES • 6 CYL
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PAMWALT1
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  • 2 POSTS
1993 gmc van backfires on start up run poor till warm up
Feb 21, 2011 at 2:11 PM
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MMPRINCE4000
  • ✓ASE Certified Mechanic
  • 8,548 POSTS
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Do you have a check engine light? If so get codes read and post to this thread.
Feb 21, 2011 at 2:14 PM
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PAMWALT1
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  • 2 POSTS
no the check engine light not on had it on computer showed nothing thought water in gas added dry gas ran good 3day filled new gas stsrted to backfire again
Feb 21, 2011 at 2:30 PM
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MMPRINCE4000
  • ✓ASE Certified Mechanic
  • 8,548 POSTS
  • ASE Certified Mechanic
Backfire is a timing issue, either dist. or a valve hanging open.
Feb 21, 2011 at 6:20 PM
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