Positive Crankcase Ventilation: Description and Operation

The Positive Crankcase Ventilation (PCV) System is designed to prevent blow-by gas from escaping to the atmosphere. The PCV Valve contains a Spring-Loaded Plunger. When the Engine starts, the Plunger in the PCV Valve is lifted in proportion to Intake Manifold Vacuum and the blow-by gas is drawn directly into the Intake Manifold.