CYLINDER 4 MISFIRE WONT GO AWAY! 2.4 TWIN CAM

2001 Pontiac Grand Am

Tiny

Materrock33

March, 8, 2012 AT 6:19 AM

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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17 Answers

Tiny

fixitmr

March, 8, 2012 AT 6:59 AM

What about switching injectors? Have you done compression test.

Tiny

Materrock33

March, 8, 2012 AT 7:03 AM

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

Tiny

Materrock33

March, 8, 2012 AT 7:08 AM

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

fixitmr

March, 8, 2012 AT 7:27 AM

New gaskets? Or silicone it?

Tiny

Wrenchtech

March, 8, 2012 AT 11:52 AM

Replace the white coil housing.

Tiny

Materrock33

March, 9, 2012 AT 4:00 PM

Thanks, I'll try that & let you know.

Tiny

Materrock33

March, 14, 2012 AT 12:36 AM

Did a compression test. 160 on cylinders 1 and 4 and around 170-172 cylinders 2 and 3. Still only mifiring on 4.

Tiny

Wrenchtech

March, 14, 2012 AT 7:00 PM

Did you replace the coil housing?

Tiny

Materrock33

March, 14, 2012 AT 7:17 PM

Yes. But how is that related to the low compression?

Tiny

Wrenchtech

March, 14, 2012 AT 7:25 PM

I don't see any low compression.

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