Chevrolet Chevette/1000 1976-1988 Repair Guide

Positive Crankcase Ventilation Valve

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REMOVAL & INSTALLATION



Gasoline Engines


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Fig. Fig. 1Positive Crankcase Ventilation system on a gasoline engine



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Fig. Fig. 2Pull the PCV valve from its grommet in the valve cover

PCV valve replacement is recommended at 30,000 miles or 2 year intervals. A clogged PCV system will cause poor idle and rough running. To replace the valve:

  1. Pull the PCV valve from the valve cover, under the air cleaner.
  2.  
  3. Using a pair of pliers, release the valve retaining clip and remove the valve.
  4.  

To install:

  1. Install the new valve and insert it into the valve cover.
  2.  
  3. Inspect all PCV connecting hoses. Replace any cracked or deteriorated hoses.
  4.  

Diesel Engines


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Fig. Fig. 3Diesel engine Positive Crankcase Ventilation (PCV) system components

Periodically check the PCV system for the following:

  1. Cracked or plugged hoses.
  2.  
  3. Remove the PCV valve cover and check the diaphragm for deterioration or damage.
  4.  
  5. Broken diaphragm spring.
  6.  
  7. Contamination of the PCV valve body.
  8.  
  9. Make sure the baffle plate located inside the cam cover isn't plugged or contaminated.
  10.  

To replace the PCV valve:

  1. Disconnect the PCV valve connecting hose.
  2.  
  3. Remove the two screws holding the PCV valve to the cam cover.
  4.  
  5. Remove the valve and gasket.
  6.  
  7. Clean the cam cover PCV mounting surface.
  8.  
  9. Use a new gasket and reverse the above to install.
  10.  

 
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