Vacuum Spark Control Delay Valve

Connect tee fitting at ports "1" and "4". Connect vacuum gauge to each fitting. Start engine. Vacuum should be equal at both ports. See Figure .
When throttle is suddenly depressed, vacuum at port "1" will instantly decrease and vacuum at port "4" should be maintained momentarily. If valve fails these tests, replace valve.

Fig 1: Spark Control System (4-Cyl. - CA Models)

Courtesy of AMERICAN MOTORS/JEEP CORP.