Escort L4-116 1.9L VIN 9 TBI (1987)
Positive Crankcase Ventilation: Testing and Inspection
PCV 1 - High Speed PCV Check
^ Bring engine to normal operating temperature.
^ Place transmission in park or neutral. Set parking brake and block wheels.
^ Place A/C-heater selector in the off position.
^ Remove vacuum control hose at the dual orifice valve assembly (located at the throttle body port).
^ Apply manifold vacuum to port.
^ Is there significant change In engine rpm?
YES -- High-speed PCV System is OK. GO to PCV2. See: PCV 2 - Low Speed PCV Check
NO -- REPLACE the dual orifice valve assembly.
