626 1999-2001

Positive Crankcase Ventilation System

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PCV Valve



Operation

Specific to:

Mazda 626 1999-2002

The PCV valve regulates the amount of ventilating air and blow-by gas to the intake manifold and prevents backfire from traveling into the crankcase.

Testing

Specific to:

Mazda 626 1999-2002

  1. Remove the PCV valve.
  2.  
  3. Blow through the valve and verify that air flows as specified:
    1. Blow into Port A and air should be felt at Port B.
    2.  
    3. Blow into Port B and air should NOT be felt at Port A.
    4.  

  4.  
  5. If not as specified, replace the PCV valve.

    Click image to see an enlarged view

    Fig. Showing the PCV valve ports for testing

  6.  

 
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