Ford 3S4Z-6A666-MB Valve Assembly

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The crankcase emission control system, also known as positive crankcase ventilation (PCV), consists of hoses connecting the crankcase to the air cleaner or intake manifold. Some engines have oil separator units located at the left-hand end or front of the engine. The system requires regular checking for blockages and damage to the hoses, valve, and oil separator. To remove the PCV valve, trace the ventilation hose to the valve and disconnect it. The valve can then be pulled out. If the hose is damaged, the thermostat housing may need to be removed for access. Wash the valve in a suitable solvent and ensure all passages are clear. Check the hoses for damage, especially at the ends, and inspect the condition of the O-ring if present. Installation is the reverse of removal, ensuring secure and correct hose installation. The oil separator is located behind the exhaust manifold and catalytic converter on the front of the engine block. Access requires removing the manifold and converter. Disconnect the hose or remove the PCV valve. The separator is secured by three bolts, which should be unscrewed to remove the separator and recover the gasket. If not already done, remove the PCV valve from the separator and wash the separator with a suitable solvent. Ensure clear passages and use a new gasket when reinstalling the separator, tightening the bolts securely.

If the model is 2004 and earlier, then you need to start the engine and detach the PCV valve from the valve cover. Check for a vacuum at the end of the valve. If there is no vacuum, take out the valve and check if there is a vacuum in the hose. Change it if necessary. Inspect whether the rubber grommet is damaged or not. Clean and examine your hose. You should install a new PCV valve if required. For models 2005-2008, you need to remove your intake manifold and disconnect a hose from a PCV valve. Remove a valve from a crankcase oil separator. Installation will be vice versa. If it's 2009 or later models, then the PCV valve refers to one of parts of the crankcase oil separator.

On SPI engines, disconnect the PCV hose from the valve, then twist the PCV valve out of the valve cover grommet.

A leaking fresh air inlet hose or grommet can cause an unmetered air leak, leading to a lean air/fuel mixture ratio, which may result in a lean misfire and other driveability issues.