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Home >> Cadillac >> 1977 >> Seville >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Auxiliary Emission Control Systems >> Pulse Air Injection Reactor >> Testing >> Functional Test

Functional Test

  1. 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.
      Fig 1: Typical Pulse Air Valve Mounting Location
      G09320693Courtesy 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.
  2. 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.
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