Q: How to remove and install the PCV valve on Lincoln MKX?
A: For four-cylinder models, remove the intake manifold and oil vent separator bolts and gasket. Clean the engine block, install a new gasket. Reverse the process for installation, ensuring bolts are secure. For V6 models, remove engine cover fasteners, oil cap, and engine cover. On 3.5L and 3.7L models, remove the upper intake manifold. The PCV valve is on the valve cover. Turn it counterclockwise for removal. Replace the PCV valve each time it's removed. Ensure correct orientation when installing the new PCV valve. Incorrect installation requires replacement.