POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [L8, LF]

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Airflow Inspection

1. Disconnect the section (A) of the ventilation hose shown in the figure.

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2. Start the engine and verify that vacuum is applied to the end of the disconnected ventilation hose while the engine is idling.

  • If vacuum does not occur in the ventilation hose, perform the procedure from Step 3.

  Note
  • If the PCV valve is operating normally, vacuum occurs in the ventilation hose, however, if there is a malfunction in the PCV valve, positive pressure occurs in the ventilation hose because the blow-by gas is circulated to the air hose from the ventilation hose.
  • Verify the ventilation hose vacuum using the following methods:
    ― When the tip of your finger touches the end of the ventilation hose, it is suctioned by the hose.
    ― When a thin scrap of paper contacts the end of the ventilation hose, it is suctioned by the hose.

3. Remove the battery cover. (See BATTERY REMOVAL/INSTALLATION [L8, LF].)

4. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [L8, LF].)

5. Remove the intake manifold and the fuel distributor component as a single unit. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L8, LF].)

6. Remove the PCV valve and the oil separator as a single unit. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [L8, LF].)

7. Verify that there is no airflow when pressure is applied to port B.

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  • If there is airflow, replace the PCV valve. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [L8, LF].)

8. Verify that there is airflow when vacuum is applied to port B.

  • If there is no airflow, replace the PCV valve. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [L8, LF].)