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Functional Test
- Connect hand vacuum pump to Pulsair valve as follows:
- On L4 engines, detach hose from fitting on valve and attach vacuum pump directly to fitting with hose or stopper-and-hose combination.
Courtesy of GENERAL MOTORS COMPANY
- On V6 engines, front and rear Pulsair valves must be tested separately: Detach hose from front valve (if equipped, disconnect Pulsair solenoid from valve). Connect hand pump directly to valve fitting with hose or stopper-and-hose combination.
- Apply more than 15 in. Hg vacuum. Note the time required for vacuum level to drop from 15 in. Hg to 5 in. Hg. If less than 2 seconds, replace valve as it is not holding vacuum properly.