4 Runner 2WD L4-144.4 2366cc 2.4L SOHC (22R-E) (1990)
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Positive Crankcase Ventilation: Description and Operation
Positive Crankcase Ventilation System
PCV Valve Operations
A Positive Crankcase Ventilation (PCV) system is used to provide more complete scavenging of crankcase vapors. Fresh air from the air cleaner is
supplied to the crankcase, mixed with the blow-by gases and then passed through a positive crankcase ventilation valve 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.
