System Inspection
- Warm engine to normal operating temperature, and let it idle. Remove Positive Crankcase Ventilation (PCV) valve from cylinder head cover port. With PCV valve attached to vent hose, block PCV valve opening and check for vacuum. See Fig 1test procedure No. 1. If no vacuum is felt, check for blockage or collapsed vent hose, or restricted PCV valve. For vent hose problem, replace or repair as necessary. For PCV valve problem, go to next step.
- For plug in type PCV valve. Note direction of valve installation. Remove PCV valve from vent hose. Blow air into port "A", verify that air comes out of port "B". Blow air into port "B", verify that no air comes out of port "A". See Fig 1test procedure No. 2. If problem is found, clean or replace PCV valve as necessary. For PCV valve screw-on type, go to next step.
- For screw-on type PCV valve. Remove PCV valve from vent hose. From threaded side insert a thin stick into PCV valve to check if plunger moves. See Fig 1 test procedure No. 3. If plunger does not move, PCV valve will be clogged. Clean or replace as necessary.
Courtesy of KIA MOTORS AMERICA, INC.