1. The PCV system allows crankcase gases to be vented through a special valve through a hose back to the intake manifold, from where they enter the combustion chambers and are burned out during the normal operation of the engine.
2. The PCV valve with a hose connected to it is seated in the rear cylinder head cover.
3. With the engine running at idle, warmed up to normal operating temperature, pull up the valve 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 - a vacuum should be felt, otherwise make sure that the hose, the fitting on the inlet pipeline and the valve itself are passable. Replace defective components.
5. When buying a new valve, make sure that it matches the size of your car engine. It would be best to directly compare the new valve with the old one removed from the engine.