ES300 1992-1997

Positive Crankcase Ventilation System

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PCV Valve



Operation

Specific to:

Lexus ES250 1990-1991

Lexus ES300 1992-1999

The PCV system consists of the breather tube and the PCV valve. The breather tube connects the crankcase to a contained fresh air source such as the air cleaner. Air passes into this tube and into the engine after being filtered through a spark arrestor screen in order to prevent the possibility of an explosion within the engine in the case of a backfire.

Removal & Installation

Specific to:

Lexus ES250 1990-1991

Lexus ES300 1992-1999

  1. Disconnect the PCV hose from the PCV valve.
  2.  
  3. Remove the PCV valve.

    Click image to see an enlarged view

    Fig. Remove the PCV valve-1996 models shown, other models similar

  4.  

To install:

  1. Installation is the reverse of removal.
  2.  

Testing

Specific to:

Lexus ES250 1990-1991

Lexus ES300 1992-1999

  1. Remove the PCV valve.
  2.  
  3. Install the clean hose to the PCV valve.
  4.  
  5. Inspect the PCV valve operation.
    1. Blow air into the cylinder head side, and check that air passes through easily.
      CAUTION
      Do not suck air through the valve. Petroleum substances inside the valve are harmful.



      Click image to see an enlarged view

      Fig. Blow air into the cylinder head side

    2.  
    3. Blow air into the air intake chamber side, and check that air passes through with difficulty.

      Click image to see an enlarged view

      Fig. Blow air into the air intake chamber side

    4.  
    5. If operation is not as specified, replace the PCV valve.
    6.  

  6.  
  7. Remove clean hose from the PCV valve.
  8.  
  9. Reinstall the PCV valve.
  10.  
  11. Inspect hoses, connections and gaskets. Visually check for cracks, leaks or damage.
  12.  

 
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