Welp, guess I'm doing a $70 spark plug change.

"If only EssExTee could be so grossly incandescent" (essextee) 09/06/2019 at 15:34 • Filed to: None

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About a year ago I got a misfire in the same cylinder. The plug was fouled and had to be replaced. Now I gotta borrow a compression tester to see if I’m losing the piston rings. Goddammit.

brianbrannon > If only EssExTee could be so grossly incandescent 09/06/2019 at 16:05

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A compression tester can not tell you if your oil rings are failing  

merged-5876237249235911857-hrw8uc > If only EssExTee could be so grossly incandescent 09/06/2019 at 16:07

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Coil on plug?  If so, move the coil around might be why the plug fouled the first time around.

If only EssExTee could be so grossly incandescent > brianbrannon 09/06/2019 at 16:08

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If I’m getting enough blow-by to foul spark plugs to failure,surely there will be missing compression, no?

This engine has 270k miles on it and as far as I know is still on the original rings.

merged-5876237249235911857-hrw8uc > If only EssExTee could be so grossly incandescent 09/06/2019 at 16:08

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Or, like in my case, carbon build up on the intake valves causes low compression.  Fun times.

If only EssExTee could be so grossly incandescent > merged-5876237249235911857-hrw8uc 09/06/2019 at 16:09

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Last time it happened  I swapped the coil to another cylinder as part of troubleshooting the misfire. Chances of that happening on the same cylinder with two different coils is close to nil.

If only EssExTee could be so grossly incandescent > merged-5876237249235911857-hrw8uc 09/06/2019 at 16:10

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Just seafoamed the engine two months ago. 

merged-5876237249235911857-hrw8uc > If only EssExTee could be so grossly incandescent 09/06/2019 at 16:11

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Yeah, also might have oil leak in the plug hole?  Could be making it worse.

ItalianJobR53 - now with added 'MERICA and unreliability > brianbrannon 09/06/2019 at 17:58

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I think it can, have not tried it tho

https://www.freeasestudyguides.com/compression-test-injecting-oil.html

ItalianJobR53 - now with added 'MERICA and unreliability > If only EssExTee could be so grossly incandescent 09/06/2019 at 17:59

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Lookit

https://www.freeasestudyguides.com/compression-test-injecting-oil.html

Mazda6 > If only EssExTee could be so grossly incandescent 09/06/2019 at 21:20

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No no one even asked what kind of car what kind of engine? My guess it’s a bad spark plug tube gasket underneath the valve cover oil is seeping  into the spark plug well

brianbrannon > If only EssExTee could be so grossly incandescent 09/20/2019 at 17:52

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No, oil rings and compression rings are separate. You can have blow by and not burn oil