Mechanics

MISFIRE

2004 Cadillac Deville

Engine Performance problem
2004 Cadillac Deville V8 Front Wheel Drive Automatic 95000 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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Joker_505
April 28, 2009.




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.

Factoryjack
Apr 28, 2009.


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