Removal & Installation
The positive crankcase ventilation (PCV) system, part of the emission control system, is designed to prevent venting of fuel and oil vapor from the crankcase into the atmosphere, and to prevent build-up of vapor pressure inside the crankcase. Intake manifold vacuum is used to draw vapors from the crankcase through the PCV valve to the combustion chamber, where they are burned. The PCV valve regulates the flow of air through the system. If the valve sticks open, excess air may lead to a lean fuel mixture and poor engine performance. If stuck closed, the resulting crankcase vapor pressure may lead to premature engine oil seal failure.
Although there is no factory recommended service interval, it is generally a good idea to check PCV valve operation during each engine tune-up, or every 30,000 miles (24,000 km). With the engine running, remove the PCV vent hose from the valve. There should be a loud hissing noise as air is drawn through the valve and vacuum should be felt when a finger is placed over the end of the valve. If not, replace the valve.
- Remove the brake booster vacuum hose from the intake manifold.
- Disconnect the PCV vent hose from the PCV valve.
- Remove the PCV valve from the intake manifold.
- The installation is the reverse of removal.