Checking and replacing the Crankcase Controlled ventilation (PCV)valve (Nissan Maxima A32)

1. The PCV system ensures the removal of crankcase gases through a special valve via a hose back into the intake manifold, from where they enter the combustion chambers and are burned out during normal engine operation.



2. The PCV valve with a hose connected to it is seated in the rear cylinder head cover.

3. With the engine idling and warmed up to normal operating temperature, pull the valve up and remove it together with the connected hose from its seat in the cylinder head cover. Reconnect the hose to the valve.

4. Press your finger against the hole in the PCV valve - you should feel a vacuum, otherwise make sure the hose, the fitting on the intake manifold and the valve itself are clear. Replace defective components.

5. When purchasing a new valve, make sure that it matches the size of your car's engine. The best way is to directly compare the new valve with the old one removed from the engine.

(The original is available on the web page: NissanBook)