MISFIRE

2004 Cadillac Deville

Tiny

joker_505

April, 28, 2009 AT 9:29 PM

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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Engine Miss

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1 Answer

Tiny

factoryjack

April, 28, 2009 AT 10:29 PM

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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