Mechanics

CYLINDER 4 MISFIRE WONT GO AWAY! 2.4 TWIN CAM

2001 Pontiac Grand Am • 164 miles

Always cylinder 4. Replaced spark plugs, boots, coil packs, tested injectors and everything is fine. Tried flipping the coil packs and tried switching plugs around, the miss stays on 4. There is also a lot of oil leaked and pooled in by the plugs. Any ideas?
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Materrock33
March 8, 2012.




What about switching injectors? Have you done compression test.

Tiny
Fixitmr
Mar 8, 2012.
Was told because injectors ohmed out fine, it wouldn't make a difference to move them. Should I still try it?

Tiny
Materrock33
Mar 8, 2012.
For the oil in there, do I need to replace the valve cover/cam cover? Or is there a simpler or easier reason and way to fix?

Tiny
Materrock33
Mar 8, 2012.
New gaskets? Or silicone it?

Tiny
Fixitmr
Mar 8, 2012.
Replace the white coil housing.

Wrenchtech
Mar 8, 2012.
Thanks, I'll try that & let you know.

Tiny
Materrock33
Mar 9, 2012.
Did a compression test. 160 on cylinders 1 and 4 and around 170-172 cylinders 2 and 3. Still only mifiring on 4.

Tiny
Materrock33
Mar 14, 2012.
Did you replace the coil housing?
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Wrenchtech
Mar 14, 2012.
Yes. But how is that related to the low compression?

Tiny
Materrock33
Mar 14, 2012.
I don't see any low compression.

Wrenchtech
Mar 14, 2012.

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