Positive Crankcase Ventilation (PCV) Valve: Inspection

Warm up engine to normal operating temperature.
Run engine at idle.
Disconnect PCV valve ventilation hose from cylinder head cover.
Block PCV valve opening.
Verify that vacuum is felt.

Fig 1: Verifying Vacuum
Courtesy of KIA MOTORS AMERICA, INC.
Remove PCV valve.
Blow through valve from port "A" and verify that air comes out of port "B".
Blow through valve from port "B" and verify that no air comes out of port "A".
Replace the PCV valve if necessary.

Fig 2: Identifying Valve Ports
Courtesy of KIA MOTORS AMERICA, INC.