Toyota Pick-ups/Land Cruiser/4Runner 1989-1996

PCV Valve

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See Figure 1

The PCV valve regulates crankcase ventilation during various engine operating conditions. At high vacuum (idle speed and partial load range) it will open slightly and at low vacuum (full throttle) it will open fully. This causes vapor to be removed from the crankcase by the engine vacuum and then sucked into the combustion chamber where it is burned along with the fuel.



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Fig. Fig. 1: The PCV valve regulates crankcase ventilation according to engine running conditions

The PCV system will not function properly unless the oil filler cap is tightly sealed. Check the gasket on the cap and be certain it is not leaking. Replace the cap or gasket or both if necessary to ensure proper sealing.

REMOVAL & INSTALLATION



See Figures 2 and 3

  1. Check the ventilation hoses and lines for leaks or clogging. Clean or replace as necessary.
  2.  
  3. Locate the PCV valve in the cylinder head cover and remove it by pulling it upward.
  4.  



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