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Old 04-10-2019, 10:57 PM   #1
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Oil on spark plug

I have a 2006 Ford Focus 2.0

I replaced my spark plugs today. One of the spark plugs was very hard to remove, so much so I thought I had stripped the threads. When I removed the spark plug the threads were fine but there was oil dripping off the sides of the plug, none on the electrode strangely. When I replaced the spark plug a bit of smoke came out of the exhuast but the smoke stopped quickly. Prior to replacing my sparkplugs, I never had smoke coming out the rear. Anyone know why their was oil on one of my spark plugs? O'ring or gasket issue?

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Old 04-11-2019, 12:13 AM   #2
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Just my thoughts, needs a new valve cover gasket and to check the pcv.

The inner gasket around that plug seems like it's bad, there may have been oil already in the well and when you took the plug out it all went into the cylinder, then when you were done and started on, that oil burned and caused the smoke (should be blueish white if it's oil), if it no longer smokes that would be the first place to look

Valve cover gasket is a minor repair, and fairly simply
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Old 04-11-2019, 12:19 AM   #3
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Valve cover gasket leaks and down to around the plug, you yank plug without looking in the hole for oil or rocks or trash noticeably, and then the leaked oil runs into the engine to come out pipe as burned oil. Engines have damaged over small trash getting in there.

Nothing wrong with the plug gasket, just the physics of how that works.
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Old 04-11-2019, 03:03 AM   #4
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Very true, always a good habit to shop vac the plug wells before you pull the plugs out
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Old 04-11-2019, 04:13 AM   #5
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I blow them out with high pressure air, you would be amazed at the cloud of crap that comes out..........if oil is in the hole you need a towel to catch it.
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Old 04-11-2019, 07:59 PM   #6
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Thank you everyone! Your response helped me a lot. The oil issue was very confusing to me because I did not think that oil could actually leak on the top of the spark plug but not the plug wells. Thanks again :@)
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