Previa Van 2WD L4-148.8 2438cc 2.4L DOHC (2TZ-FE) (1992)
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Positive Crankcase Ventilation: Description and Operation
Positive Crankcase Ventilation System
PCV Valve Operations
PURPOSE
A Positive Crankcase Ventilation (PCV) system is used to provide more complete scavenging of crankcase vapors.
OPERATION
Fresh air from the air cleaner is supplied to the crankcase, mixed with blow-by gases and then passed through a metered orifice into the intake
system. Once in the intake system the mixture is then added to the intake fuel/air charge and burned in the combustion process.
