Positive Crankcase Ventilation: Description and Operation

CCV System:

The CCV system is similar to a conventional PCV system, but does not use a vacuum controlled valve. When the engine is operating, fresh air enters the crankcase and mixes with crankcase vapors. Manifold vacuum draws the vapors through a metered orifice (2.2 MM) and into the intake manifold. The vapors then mix with the air/fuel mixture and are burned in the combustion chamber.