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Neither...
Posted by Joe98 (more from Joe98) on Mon, 9 Aug 2004 13:19:14
In Reply to: Thanks Joe, and this oil is coming form the valve cover, Daren, Mon, 9 Aug 2004 13:02:51
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it is a normal by-product of the turbo system itself. I honestly do not know why the oily residue is included in the charged-air. Could it be from the bead of oil that the turbine spins on (to help keep it cool and lubed)?
There is oil in the crankcase vapors that exit the PCV system and then into the TB. I had to replace that grommet on the top of the crankcase where the hose attachment is installed for the PCV hoses. Mine was soft and slightly leaking an oily residue on the top of the DI cover. I got one from eEuroparts. Not exactly like oem, but close enough and works.
Take the charged-air system apart (all the tubing) and see for yourself how grimy it is. Definitely give the intake air temp sensor a shot of carb cleaner and re-install. Simple, but important, maintenance. Don't scrub it; just use the high-pressure of the carb cleaner do its job.
Joe
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