System Inspection
Purge system operation takes place when vehicle is driving in gear (off idle), engine is at operating temperature and oxygen sensor is functioning normally. Warm engine to normal operating temperature. Check for vacuum at hose from Purge Solenoid Valve (PSV) to Evaporative Emissions (EVAP) canister. If vacuum exists, replace PSV.
- Warm engine to normal operating temperature, and operate it at idle. Disconnect Positive Crankcase Ventilation (PCV) valve with vent hose attached to valve cover. Block PCV valve opening and check for vacuum. If no vacuum is felt, check for collapsed line and blockage.
- Note direction of valve installation. Remove PCV valve. Blow air into upper port of valve. Air should not flow through valve from lower port. Blow air into lower port of valve. Air should flow from upper port. Replace valve as necessary.