General Description

The PCV system:
^ uses intake manifold vacuum to remove blow-by fumes from the crankcase
^ returns the fumes to the intake manifold for combustion

The Positive Crankcase Ventilation (PCV) valve:
^ varies the amount of blow-by gases returned to the intake manifold based on available engine vacuum
^ prevents the entry of combustion backfiring into the crankcase

The PCV system consists of:
^ crankcase ventilation tube
^ positive crankcase ventilation valve
^ crankcase vent oil separator
^ crankcase pressure relief hose and valve assembly