S-Type (X200) V8-4.2L (2005)
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Positive Crankcase Ventilation: Description and Operation
Engine Emission Control - VIN Range: N52048->N99999
Positive Crankcase Ventilation (PCV) System
The PCV system recycles crankcase gases back through the engine where they mix with incoming air/fuel charge and help to reduce hydrocarbon
emissions.
Vehicles with 3.0L engine
The PCV system consists of two hoses, connected between the left-hand valve cover and the intake manifold and the right-hand valve cover and the air
cleaner outlet pipe.
Vehicles with 4.2L engine
The PCV system consists of a valve, and two hoses. The PCV valve is mounted on the right-hand valve cover and a hose is connected between PCV
valve and the throttle body elbow. The left-hand valve cover PCV hose is connected to the air cleaner outlet pipe.
The PCV valve regulates the amount of ventilation air and crankcase gas supplied to the intake manifold and also prevents backfiring into the crankcase.
