Positive Crankcase Ventilation (PCV) Valve: Inspection

1. Disconnect the ventilation hose from the positive crankcase ventilation (PCV) valve. Remove the PCV valve from the rocker cover and reconnect it to the ventilation hose.
2. Run the engine at idle and put a finger on the open end of the PCV valve and make sure that intake manifold vacuum is felt. If vacuum is not felt, the PCV valve and ventilation hose are probably clogged and should be cleaned.
   Fig 1: Checking Positive Crankcase Ventilation Valve (1 Of 2)

   Courtesy of KIA MOTORS AMERICA, INC.
3. Remove the positive crankcase ventilation valve.
4. Insert a thin stick into the positive crankcase ventilation valve from the threaded side to check that the plunger moves.
   NOTE: The plunger inside the PCV valve will move back and forth.
5. If the plunger does not move, the positive crankcase ventilation valve will be clogged. Clean it using cleaning solvent, or replace if necessary.

Fig 2: Checking Positive Crankcase Ventilation Valve (2 Of 2)

Courtesy of KIA MOTORS AMERICA, INC.