Engine misfire at idle

Tiny
1969ROADRUNNER
  • MEMBER
  • 2003 CADILLAC STS
  • 6 CYL
  • 92,000 MILES
Engine misfire at idle on #1 cylinder / runs good down the road/ shor and long term trin values plus or minus 2
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Tuesday, February 15th, 2011 AT 1:59 AM

1 Reply

Tiny
FACTORYJACK
  • EXPERT
You have determined that it misfires on #1 through reading data? You have also built the vehicle as 2003 STS with a 3.2 v6, which there was none. There was a CTS in 2003 that had a 3.2. Is it a 3.2 CTS, or a 4.6 STS? In either case, a misfire at idle that goes away off idle can be a result of a valve that is leaking due to poor seating, or perhaps a cam follower or broken valve spring concern.
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Friday, February 18th, 2011 AT 4:05 AM

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