Functional Test
- Connect hand vacuum pump to Pulse Air valve as follows:
- On 4 cylinder 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 and V8 engines, front and rear Pulse Air valves must be tested separately. Disconnect hose from front valve, and if equipped, disconnect Pulse Air solenoid from valve. Connect pump to front or rear valve fitting with hose or stopper-and-hose combination.
- Apply more than 15 in. Hg. 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.