GM Corsica/Beretta 1988-1996 Repair Guide

Positive Crankcase Ventilation (PCV) Valve

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See Figures 1 and 2

All engines, except the 2.3L engine, use a Positive Crankcase Ventilation (PCV) valve to regulate crankcase ventilation during various engine running 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 vapors to be drawn from the crankcase by engine vacuum and then sucked into the combustion chamber where they are dissipated. The crankcase ventilation system used on the 2.3L engine does not use a PCV valve. This system requires no regular scheduled maintenance. Details on all PCV system, including system tests, are given in Emission Controls .



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Fig. Fig. 1: Example of the crankcase ventilation airflow



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Fig. Fig. 2: Cross-sectional view of a PCV valve

The PCV valve must be replaced every 30,000 miles and is located in a rubber grommet in the valve cover, connected to the air cleaner housing by a large diameter rubber hose.

REMOVAL & INSTALLATION



See Figures 3 and 4

  1. Disconnect the hose from the PCV valve.
  2.  
  3. If necessary, remove the retainer or cover.
  4.  
  5. Pull the valve from the rubber grommet in the valve cover.
  6.  

To install:
  1. Press the PCV valve back into the rubber grommet in the valve cover, making sure it is properly seated.
  2.  
  3. If necessary, install the cover or retainer.
  4.  
  5. Connect hose to the PCV valve.
  6.  



Click image to see an enlarged view

Fig. Fig. 3: Disconnect the hose from the PCV valve mounted in the valve cover ...



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Fig. Fig. 4: ... then pull the PCV valve out of the grommet in the valve cover

 
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