Vacuum Delay Valve: Testing and Inspection

Fig. 41 Testing Vacuum Delay Valve.:

1. Disconnect the vacuum delay valve.
2. Connect 1.0 m or 3 ft. of vacuum hose to a vacuum pump tester Fig. 41.
3. Connect the vacuum valve to the hose.
4. Block the other side of the vacuum delay valve.
5. Apply a vacuum of over 600 mm Hg (23.6 in Hg).
6. Release the block from the vacuum delay valve and check the time required for the vacuum reading to drop to 100 mm Hg (3.9 in Hg) from 500 mm Hg (19.7 in Hg).
7. The time should be between 1.5-4.5 seconds.

Fig. 42 Direction Of Air Flow, Vacuum Delay Valve.:

NOTES: When blown through the valve from port B air passes quickly.
When blown through the valve from port A air passes slowly Fig. 42.
Install the vacuum delay valve so that the arrow mark on the valve is towards the EGR modulator valve.