Toyota Celica/Supra 1971-1985 Repair Guide

PCV Valve

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REMOVAL & INSTALLATION



See Figures 1, 2, 3, 4, 5 and 6



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Fig. Fig. 1: The PCV valve is located in the valve cover-22R and 22R-EC engines shown



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Fig. Fig. 2: Remove the PCV valve hose from the valve ...



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Fig. Fig. 3: ... then, pull the valve out of the valve cover



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Fig. Fig. 4: The PCV valve regulates crankcase ventilation according to engine running conditions



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Fig. Fig. 5: Air should not pass through the PCV when blowing through the intake manifold side



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Fig. Fig. 6: Air should pass through the PCV when blowing into the crankcase side

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 dissipated.

  1. Check the ventilation hoses for leaks or clogging. Clean or replace as necessary.
  2.  
  3. Locate the PCV valve in the cylinder head cover. Remove it.
  4.  
  5. Blow into the crankcase end of the valve. There should be free passage of air through the valve.
  6.  
  7. Blow into the intake manifold end of the valve. There should be little or no passage of air through the valve.
  8.  
  9. If the PCV valve failed either of the preceding two checks, it will require replacement.
  10.  
  11. Inspect the PCV grommet. Replace if necessary.
  12.  

To install:
  1. Insert the PCV valve into the grommet.
  2.  
  3. Place the ventilation hose on the end of the valve.
  4.  

 
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