Nissan Maxima 1993-1998 Repair Guide

Positive Crankcase Ventilation (PCV) Valve


See Figure 1

This valve feeds crankcase blow-by gases into the intake manifold to be burned with the normal air/fuel mixture. The PCV valve has no strict interval for maintenance. However, it is wise to check the system occasionally in case of clogging, especially if you know that you have a vehicle that has been neglected. Make sure all PCV connections are tight. Check that the connecting hoses are clear and not clogged. Replace any brittle or broken hoses.

Click image to see an enlarged view

Fig. Fig. 1: PCV valve operation


See Figure 2

  1. Squeeze the hose clamp with pliers and remove the hose.
  3. If the valve has screw threads, use a wrench to unscrew it and remove the valve.
  5. Disconnect the ventilation hoses; clean them if they are dirty.
  7. Install the new PCV valve and replace the hoses and clamp.

Click image to see an enlarged view

Fig. Fig. 2: PCV valve location on the VE30DE engine (arrow)