2004 Cadillac Deville misfire

Tiny
JOKER_505
  • MEMBER
  • 2004 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 95,000 MILES
I have an 04 deville with multiple misfires. I have replaced the plugs and coil packs, and it got a little better but it still misfires enough not to pass emissions. Any idea's?
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Tuesday, April 28th, 2009 AT 9:29 PM

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Tiny
FACTORYJACK
  • EXPERT
If you can determine which cylinders, swap some secondary parts. If the misfires are on 1 bank, swap the coils. Or change plugs of affected cylinders. If the fault stays with the cylinder, you could have dirty/sticking injectors, water in the fuel, or a mechanical problem. A compression and leakdown test would be advised at that point.
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Tuesday, April 28th, 2009 AT 10:29 PM

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