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].)