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I'm diagnosing an air leak right now, so I took of the rigid plastic pipe connecting the throttle body to the accordion pipe (from the intercooler) to gain better access to the VNT actuator. I noticed that the butterfly valve and throttle body were covered in soot and the rounded "wells" in the accordion pipe had little oil (I'm assuming oil; it was black) puddles in them. Is this normal? If it is, is there a cleaning procedure? If it is not normal, what could be the cause, and could it be related to my air leak (possible recirculation of exhaust)? The car is an '06 TDI with 102k miles on it.
Thanks for any input!
Thanks for any input!