Vacuum Control Flap Switchover Valve: Testing and Inspection

Connect a vacuum gauge to the ``EGR'' or ``T.C.C.'' solenoid port, while connecting a suitable vacuum pump to the ``Vacuum Regulator Valve'' port. Apply 15 inches Hg vacuum draw to ``VRV'' port, while noting reading of vacuum gauge. Vacuum gauge should read 2.5 inches lower than vacuum pump on all High Altitude V8 engines; and .75 inches lower on V6 and V8 (Exc. High Alt.) engines.