Envoy 2WD V8-5.3L VIN M (2005)
Positive Crankcase Ventilation: Description and Operation
Crankcase Ventilation System Description
A closed crankcase ventilation system provides a more complete scavenging of crankcase vapors. Fresh air from the throttle body is supplied to the
crankcase, mixed with blow-by gases, and then passed through a crankcase ventilation pipe/passage into the intake manifold.
Results of Incorrect Operation
A plugged positive crankcase ventilation (PCV) pipe/passage way may cause any of the following conditions:
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Rough idle
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Stalling or slow idle speed
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Oil leaks
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Sludge in engine
