Positive Crankcase Ventilation: Description and Operation

PCV Valve:

PCV System:

PURPOSE

PCV system reduces crankcase emissions.

OPERATION

Crankcase vapors drawn through PCV valve into intake manifold by manifold vacuum. Vapors mix with air/fuel mixture, and are burned during combustion.

CONSTRUCTION

Closed system consists of PCV valve, hose from PCV valve to intake manifold, crankcase inlet air filter, and hose connecting valve cover to air cleaner assembly, (vacuum vapor harness connection).

NOTE: PCV valve should only be replaced with valve designed for this system.