Ford F75Z-6A666-BA Valve Assembly

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The Positive Crankcase Ventilation (PCV) system reduces hydro-carbon emissions by scavenging crankcase vapors. It does this by circulating fresh air from the air cleaner through the crankcase, where it mixes with blow-by gases and is then rerouted through a PCV valve to the intake manifold. The main components of the PCV system are the PCV valve, a fresh air filtered inlet and the vacuum hoses connecting these two components with the engine and the EECS system. To maintain idle quality, the PCV valve restricts the flow when the intake manifold vacuum is high. If abnormal operating conditions arise, the system is designed to allow excessive amounts of blow-by gases to flow back through the crankcase vent tube into the air cleaner to be consumed by normal combustion. On 2005 and later Expedition/Navigator models, an electric heating element is added to the PCV system, to further reduce emissions in cold weather conditions by more complete combustion of the hydrocarbons introduced to the intake manifold by the PCV system. The heating element is bolted to the intake manifold with the PCV hose from the left valve cover attached to it.