97 Cadillac STS back fires

Tiny
MICHAEL HILL
  • MEMBER
  • 1997 CADILLAC STS
  • V8
  • FWD
  • AUTOMATIC
  • 126,000 MILES
MY 97 CADILLAC STS BACK FIRES ONLY WHEN IM TRYING TO FIR IT UP
Saturday, February 19th, 2011 AT 8:26 PM

1 Reply

Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
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.
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Tuesday, February 22nd, 2011 AT 4:54 AM

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