Positive Crankcase Ventilation: Testing and Inspection

NOTE: Be sure to check that there is no obstruction in PCV valve or its hoses before adjusting engine idle speed, for obstructed PCV valve or hose hampers its accurate adjustment.

PCV Hose Inspection
Check hoses for connection, leakage, clog, and deterioration. Replace as necessary.

PCV Valve Inspection
1. Disconnect PCV valve from cylinder head cover and install plug to head cover hole.
2. Run engine at idle.





3. Place your finger over end of PCV valve to check for vacuum. If there is no vacuum, check for clogged valve. Replace as necessary.





4. After checking vacuum, stop engine and remove PCV valve. Shake valve and listen for the rattle of check needle inside the valve. If valve does not the rattle, replace valve.
5. After checking, remove plug and install PCV valve.