Q: How do you check and replace the PCV valve in a Toyota T100,Toyota 4Runner and Toyota Tacoma?
A: The PCV valve is usually located in the valve cover. Also, inspect it by idling the engine, pulling the valve, and testing for a vacuum by placing the finger over the valve opening. If there's no vacuum, there is a clogged valve or deteriorated hose. Also, shake the valve with the engine off.