Cadillac 25098706 Valve,Crankcase Depression Regulator

If you don't feel any vacuum, this could indicate a clogged hose, manifold port, or the valve itself. In this case, any plugged or deteriorated hoses should be replaced.

The PCV valve is typically found in the rocker arm cover. To check it, start the engine and let it idle until it reaches normal operating temperature. Then, pull the valve out of the rubber grommet in the cover, leaving the hose attached. Place your finger over the valve opening. If you don't feel any vacuum, this could indicate a clogged hose, manifold port, or the valve itself. In this case, any plugged or deteriorated hoses should be replaced. Next, turn off the engine and shake the PCV valve. If it doesn't rattle, it needs to be replaced. To do this, pull the valve out of the end of the hose, remembering how it was positioned. When buying a new PCV valve, ensure it's the correct one for your vehicle and engine size by comparing it to the old valve. Once you have the new valve, push it into the end of the hose until it's seated. Check the rubber grommet for any damage and replace it if necessary. Finally, push the PCV valve and hose back into their original position.