The PCV system captures these gases and returns them to the engine for afterburning. Located in the valve housing, the PCV valve directs flow to the engine. If the locking pin in the valve is closed, the motor may be pressurized. If left open, too much gas can build up in the engine, resulting in rich mixture, black exhaust, and generally poor engine thrust.
The function of the valve should be checked every 50,000 km or whenever there are emission related problems. If the valve is functioning normally, it does not need to be replaced.
Check hoses for cracks, leaks, or blockages. With the engine idling and warm, use your fingers or pliers to gently pinch the hose connected to the valve. The valve should click when the hose is pinched.
If no click is heard, check the rubber seal near the valve for cracks or damage. If it is OK, replace the valve.
Removal and installation
To remove the valve, disconnect the hose and pull the O-ring off the valve. Install a new valve and connect the hose. It is not recommended to try to clean the valve; you always have to replace it.
Install the new valve firmly onto the o-ring. Connect the hose securely.
For more information on maintenance of emission control components, please refer to Chapter 4 guide.