Toyota 12204-10020 Valve Sub-Assy, Ventilation

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The PCV valve and hose are located in the valve cover. To remove it, grasp the hose securely and pull the PCV valve out of the cover. With the engine idling at normal operating temperature, place your finger over the end of the valve. If there's no vacuum at the valve, check for a plugged hose or valve and replace any that are plugged or deteriorated. After turning off the engine, remove the PCV valve from the hose. Connect a clean piece of hose and blow through the valve from the valve cover (cylinder head) end. If air will not pass through the valve in this direction, replace it with a new one. To check the PVC valve, first attach a clean section of hose to the cylinder head side of the valve and blow through it - air should pass through easily. Then blow through the intake manifold side of the valve and verify that air passes through with difficulty. When purchasing a replacement PCV valve, make sure it's for your particular vehicle and engine size. Compare the old valve with the new one to make sure they're the same.