Cherokee 2WD L4-150 2.5L VIN H TBI (1988)
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.
