Engine Emission Control - Overview: Overview
NOTE:
Do not permanently remove or render inoperative any part of the vehicle emission control system including related hardware. Failure to comply may violate applicable state and federal laws.
NOTE:
The vehicle emission routing diagrams are contained in the Description and Operation subsection of the Evaporative Emissions.
Refer to: Evaporative Emissions - System Operation and Component Description .
The PCV system uses intake manifold vacuum to ventilate blow-by vapors and evaporated oil from the crankcase and returns them to the intake manifold for combustion. The PCV valve varies the amount of blow-by vapors and evaporated oil returned to the intake manifold.