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Where is the PCV valve on a 2001 Ford Ranger with 4.0 liter?

On a 2001 Ford Ranger with a 4.0L engine, the PCV valve is located on the valve cover. It's usually a small, cylindrical valve with a single hose connected to it. It's often near the back of the valve cover, but its exact position can vary slightly. You'll need to visually inspect the valve cover to locate it. It might be easier to find with the engine bay clean and some good lighting.