2004 Cadillac Deville misfire

2004 CADILLAC DEVILLE
95,000 MILES • V8 • FWD • AUTOMATIC
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JOKER_505
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  • 1 POST
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?
Apr 28, 2009 at 9:29 PM
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FACTORYJACK
  • ✓ASE Certified Mechanic
  • 4,159 POSTS
  • ASE Certified Mechanic
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.
Apr 28, 2009 at 10:29 PM
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