97 cadillac sts back fires

1997 CADILLAC STS
126,000 MILES • V8 • FWD • AUTOMATIC
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MICHAEL HILL
  • MEMBER
  • 1 POST
MY 97 CADILLAC STS BACK FIRES ONLY WHEN IM TRYING TO FIR IT UP
Feb 19, 2011 at 8:26 PM
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FACTORYJACK
  • ✓ASE Certified Mechanic
  • 4,159 POSTS
  • ASE Certified Mechanic
Some backfiring is common characteristic, if you release the key prior to it starting. Another possibility is a leaking fuel pressure regulator adding some extra fuel to the intake.
Feb 22, 2011 at 4:54 AM
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