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Old 12-10-2017, 06:14 PM   #1
DevilzMafia
 
Drives: Toyota Yaris 2007
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Oil on Spark Plug threads

Just took out the plugs for the regular replacement, and for the first time noticed oil on the spark plug threads.

To note:
1) Doesn't throw blue smoke or drink oil (so I doubt it's the rings)
2) Doesn't smoke at startup either

So I was thinking valve gasket cover or valve stem seals?

What do you guys think?

Linked the image here: https://ibb.co/hv2rUb
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Old 12-10-2017, 08:17 PM   #2
tmontague
 
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Most likely your valve cover gasket. Oil coming from up top then leaking down through threads. Valve stem seals typically cause blue smoke after idle due to the higher vacuum at idle iirc. Stem seals also are not known to go on the 1nz.

Replace the valve cover gasket and you should be good to go
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Old 12-10-2017, 09:14 PM   #3
DevilzMafia
 
Drives: Toyota Yaris 2007
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Quote:
Originally Posted by tmontague View Post
Most likely your valve cover gasket. Oil coming from up top then leaking down through threads. Valve stem seals typically cause blue smoke after idle due to the higher vacuum at idle iirc. Stem seals also are not known to go on the 1nz.

Replace the valve cover gasket and you should be good to go
Thanks bro, I appreciate your advice!
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