A crankcase ventilation system is used to consume crankcase vapors in the
combustion process instead of venting them to atmosphere. Fresh air from
the throttle body is supplied to the crankcase, mixed with blow by gases and
then passed through a PCV valve into the intake manifold.
The primary control is through the positive crankcase ventilation (PCV)
valve which meters the flow at a rate depending on inlet vacuum. To
maintain idle quality, the PCV valve restricts the flow when inlet vacuum is
high. If abnormal operating conditions arise, the system is designed to allow
excessive amounts of blow by gases to back flow through the crankcase
vent into the throttle body to be consumed by normal combustion.
combustion process instead of venting them to atmosphere. Fresh air from
the throttle body is supplied to the crankcase, mixed with blow by gases and
then passed through a PCV valve into the intake manifold.
The primary control is through the positive crankcase ventilation (PCV)
valve which meters the flow at a rate depending on inlet vacuum. To
maintain idle quality, the PCV valve restricts the flow when inlet vacuum is
high. If abnormal operating conditions arise, the system is designed to allow
excessive amounts of blow by gases to back flow through the crankcase
vent into the throttle body to be consumed by normal combustion.
Positive Crankcase Ventilation
Warning Lights
