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Functional Test

Connect a hand vacuum pump or other vacuum source to rubber hose end of pulse air valve. With 15 in. Hg vacuum, there will be an allowable drop to 5 in. Hg vacuum in 2 seconds. If vacuum drops in less than 2 seconds, replace valve and/or hose.

Fig 1: Pulse Air Valve Mounting Location Shown (Chevette Illustrated; Others Similar)

Courtesy of GENERAL MOTORS COMPANY

NOTE: Also see General Motors Computer Command Control in this section.