### Positive Crankcase Ventilation Valve

#### REMOVAL & INSTALLATION

The PCV valve feeds crankcase blow-by gases into the intake manifold to be burned with the normal air/fuel mixture. The PCV valve, hose and connections should be inspected every 30,000 miles or 24 months. Make sure that all PCV connections are tight. Check that the connecting hoses are clear and not clogged. Replace any brittle or broken hoses.

To check the valve's operation, remove the valve's ventilation hose with the engine idling. If the valve is working, a hissing noise will be heard as air passes through the valve, and a strong vacuum will be felt when you place a finger over the valve opening.

Fig. 1: Inspection of PCV valve

Fig. 2: Inspection of PCV valve hose

Fig. 3: PCV valve filter location

On all Stanza models with a carburetor CA20 and CA20S engines a PCV filter is used. To replace this filter just remove the wing nut from the air cleaner lid and remove lid, gently lift out the filter which is mounted on the side of the air cleaner. This filter is usually about 4 in. (102mm) long.

To replace the valve, which is located in the side or bottom of the intake manifold:

1. Squeeze the hose retaining clamp with pliers and remove the hose.

   Fig. 4: PCV valve location — 1982 200SX model

   Fig. 5: PCV valve system, 1984 and later 200SX model — turbo engine on right

   Fig. 6: PCV valve location — 200SX model with VG30E engine

   Fig. 7: PCV valve location — 200SX model with CA18ET engine

   Fig. 8: PCV valve location — 200SX model with CA20E engine

   Fig. 9: PCV valve location — 240SX model with KA24DE engine

2. Using a wrench, unscrew the PCV valve and remove the valve.
3. Disconnect the ventilation hose and flush with solvent or clean as necessary.
4. Install the new PCV valve and replace the hoses and clamp.

   NOTE: On the 240SX model the PCV valve is located on the side or front of the intake collector assembly. On the 200SX with the VG30E engine the PCV valve is located in the end of the ventilation hose coming from the rocker cover. Refer to the illustrations for locations.