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 System:

PCV HOSE
- Check hoses for connection, leakage, clog, and deterioration. Replace as necessary.

Checking PCV Valve For Vacuum:

PCV VALVE
- Disconnect PCV hose from PCV valve.
- Run engine at idle.
- Place your finger over end of PCV valve to check for vacuum. If there is no vacuum, check for clogged valve. Replace as necessary.

Checking For Stuck PCV Valve:

- After checking vacuum, stop engine and check PCV valve for sticking. With engine stopped, connect a new hose to PCV valve. Blow air into new hose and check that air flows with difficultly from cylinder head side to intake manifold side. If air flows freely, valve is stuck open. Replace valve.
- Connect PCV hose and clamp securely.