Positive Crankcase Ventilation (PCV) System: Overview

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, 2011 Ford Fusion, 2010 Mercury Milan, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Do not remove the PCV system from the engine. Removal of the PCV system adversely affects the fuel economy and engine ventilation and results in shorter engine life.

The PCV system cycles crankcase gases back through the induction system into the engine where they are burned. The PCV valve regulates the amount of ventilated air and blow-by gases to the intake manifold.

The hybrid vehicle uses a non-heated PCV system. PCV systems that comply with on board diagnostics (OBD) PCV monitoring requirements use a quarter-turn camlock thread design at one end to prevent accidental disconnection from the valve cover. For more information about the PCV monitor, refer to POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM MONITOR .