PCV System: Operation
Blow-by gases from the crankcase are routed to an oil separator, then drawn through one of 2 circuits into the engine. The upper circuit hose with a .2" (5 mm) orifice leads to a throttle body port just downstream from the airflow sensor.
The lower circuit leads to the intake manifold and is connected to the fuel evaporation system. A .07" (2 mm) orifice is used near the oil separator, and a .08" (2 mm) orifice is provided in the hose to the carbon canister.