Spark Delay Valve System: Testing

Connect a hand vacuum pump and hose to valve to be tested. Valves with both sides the same color are good if vacuum can be built up in both directions before bleeding off. Valves with one side black or white and the other side colored are good if vacuum can be built up in one direction only before bleeding off.

Fig 1: Four Types of Vacuum Delay Valves

Courtesy of CHRYSLER GROUP, LLC