PCV System Testing, Removal & Installation: Inspection

1. Remove the positive crankcase ventilation valve.
2. Insert a thin stick into the positive crankcase ventilation valve from the threaded side to check that the plunger moves.
3. If the plunger does not move, the positive crankcase ventilation valve is clogged. Clean or replace it.

Fig 1: Inspecting PCV Valve Operation

Courtesy of KIA MOTORS AMERICA, INC.