TwinTurbo.NET: Nissan 300ZX forum - Likely the VTC.
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Subject Likely the VTC.
     
Posted by CoHPhasor on January 26, 2011 at 8:34 PM
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In Reply To alright in that case... posted by Khronik on January 26, 2011 at 06:00 PM
     
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You need to get a good eye back there.
Things that can leak in that area:
VTC
exhaust valve covers
"half-moon" plugs
PCV valves/hoses
Turbos

Usually the RTV that goes on the VTC under the intake valve covers can leak, or the rubber "half-moon" plugs on the exhaust valve covers are suspect.
If it's the half-moons, you can replace them with nice aluminum ones that won't "shrink" made by BDE.

Exhaust valve covers are a *bitch*, if you have the EGR still.

Also check your PCVs, I know when I changed mine I realized THAT was what put oil onto my PS O2 sensor (ruining it).

     
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