Lincoln F75Z-6A666-BA Valve Assembly

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The Positive Crankcase Ventilation (PCV) system reduces hydrocarbon emissions by circulating fresh air from the air cleaner, mixing with blow-by gases, and rerouting through a PCV valve. The PCV system consists of a PCV valve, a fresh air-filtered inlet, and vacuum hoses, and the PCV valve is meant to restrict flow to maintain idle quality. On 2005 and later Expedition/Navigator models, an electric heating element is added to the PCV system.

Remove the valve and check for vacuum at the hose. If vacuum is present at the hose but not at the valve, replace the valve. If no vacuum is felt at the hose, check for a plugged or cracked hose between the PCV valve and the intake plenum.

The purpose of the PCV system is to reduce hydro-carbon emissions by scavenging crankcase vapors.

The PCV valve is located in the right (passenger's side) valve cover.