Oil covered plug???? - Miata Forumz - Mazda Miata Chat Forums
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NA (1989-1997) NA Miata discussion within. The MX5's first generation, the NA, sold over 400,000 units from 1989 to 1997.

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Old 03-13-2012, 11:20 AM   #1
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Default Oil covered plug????

Hey guys, 91 1.6 liter third plug back is covered in oil. Starts to miss every three or so weeks and when I check plugs that one is covered with oil. Change plug and all is fine for a few weeks. What y'all think, rings or.......?
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Old 03-13-2012, 11:21 AM   #2
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have a compression and leakdown test ran, may be rings or headgasket, or even valve seals.
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Old 03-13-2012, 11:36 AM   #3
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Originally Posted by DROPTOP View Post
Hey guys, 91 1.6 liter third plug back is covered in oil. Starts to miss every three or so weeks and when I check plugs that one is covered with oil. Change plug and all is fine for a few weeks. What y'all think, rings or.......?
the plug is covered in oil...on the inside (ie electrode and ground) or on the outside?
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Old 03-13-2012, 01:22 PM   #4
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Valve cover gasket.

I didn't change mine for nearly 130k miles. I had two plugs covered in oil. Motor is still fine.
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Old 03-13-2012, 02:02 PM   #5
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Valve cover gasket.

I didn't change mine for nearly 130k miles. I had two plugs covered in oil. Motor is still fine.
This, if the outside is cover in oil. Same deal about 130k and my plugs would be covered.
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Old 03-13-2012, 02:03 PM   #6
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threads or electrode?
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Old 03-14-2012, 10:05 AM   #7
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Threads and electrode....
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Old 03-14-2012, 10:30 AM   #8
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Valve Cover. feel the sides of the plug hole, does it have oil on it?
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Old 03-14-2012, 08:04 PM   #9
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i had this- was valve cover gasket.
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