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Home >> Mazda >> 1990 >> 929 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Positive Crankcase Ventilation (PCV) System >> System Inspection
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System Inspection

Warm engine to normal operating temperature and run at idle. Disconnect PCV valve together with vent hose from valve cover. Block PCV valve opening and check for vacuum. If no vacuum is felt, check for collapsed line or blockage. See FUEL EVAPORATION vacuum diagrams for hose routing.