System Overview

WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

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 law.

NOTE: The vehicle emission vacuum routing diagrams are contained in the Description and Operation subsection of the Evaporative Emission section. For additional information, refer to EVAPORATIVE EMISSIONS .

The Positive Crankcase Ventilation (PCV) valve, is a one-way valve that uses intake manifold vacuum to ventilate blow-by gases from the crankcase and returns the gases to the intake manifold for combustion.