CYLINDER 4 MISFIRE WONT GO AWAY! 2.4 TWIN CAM

  • Tiny
  • Materrock33
  • 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?

Thursday, March 8th, 2012 AT 6:19 AM

17 Answers

  • Tiny
  • fixitmr
  • Member

What about switching injectors? Have you done compression test.

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Thursday, March 8th, 2012 AT 6:59 AM
  • Tiny
  • Materrock33
  • Member

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

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Thursday, March 8th, 2012 AT 7:03 AM
  • Tiny
  • Materrock33
  • Member

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?

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Thursday, March 8th, 2012 AT 7:08 AM
  • Tiny
  • fixitmr
  • Member

New gaskets? Or silicone it?

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Thursday, March 8th, 2012 AT 7:27 AM
  • Tiny
  • Wrenchtech
  • Expert
  • 19,541 posts

Replace the white coil housing.

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Thursday, March 8th, 2012 AT 11:52 AM
  • Tiny
  • Materrock33
  • Member

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

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Friday, March 9th, 2012 AT 4:00 PM
  • Tiny
  • Materrock33
  • Member

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

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Wednesday, March 14th, 2012 AT 12:36 AM
  • Tiny
  • Wrenchtech
  • Expert
  • 19,541 posts

Did you replace the coil housing?

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Wednesday, March 14th, 2012 AT 7:00 PM
  • Tiny
  • Materrock33
  • Member

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

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Wednesday, March 14th, 2012 AT 7:17 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 19,541 posts

I don't see any low compression.

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Wednesday, March 14th, 2012 AT 7:25 PM

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