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. PCV 2 - Low Speed PCV Check

NO -- REPLACE the dual orifice valve assembly.