oily smell
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Positive Crankcase Ventilation valve - It's a metal valve on the back of the inlet manifold, under the throttle body.
It lets the engine ingest crankcase vapors when running in a vacuum condition, and closes off when on boost to stop crankcase pressurisation.
It's fairly common practice to block it off when using a catchcan setup and/or on a race engine.
It lets the engine ingest crankcase vapors when running in a vacuum condition, and closes off when on boost to stop crankcase pressurisation.
It's fairly common practice to block it off when using a catchcan setup and/or on a race engine.
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