Vacuum Delay Valve

NOTE: Before removing, note direction of arrow on vacuum delay valve to ensure valve is installed in proper direction.

Disconnect and remove vacuum delay valve. Connect hand-operated vacuum pump, with gauge, to inlet side of delay valve. Hold thumb over outlet side of delay valve and apply 19.7 in. Hg vacuum to delay valve. See Fig 1 .

Fig 1: Testing Vacuum Delay Valve Arrow on valve points toward intake manifold vacuum signal.
Release thumb from delay valve and check time required for vacuum reading to decrease from 15.7 in. Hg to 3.9 in. Hg. Specified time should be 6.7-3.7 seconds.