N54 Crankcase Ventilation System

N54 Crankcase Ventilation System Issues (Otherwise known as Positive Crankcase Ventilation - PCV)

During normal engine operation/combustion, the crankcase will fill with blow by gasses. In order for a CVS system to work there has to be a vacuum source that is connected to the crankcase. This is typically done via ports on the valve cover.intake.Because of the nature of Forced Induction (FI) there is what is referred to as the low and high side to the Positive Crankcase Ventilation (PCV) system. The low and high refer to the pressure in the intake between throttle body and cylinder head ports. High side means when there is pressure in the intake, which on a turbo car is when the throttle is open and the turbos are creating boost. Low side means when there is vacuum which is when the throttle is shut under deceleration and at idle.

 
 

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