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Home >> Buick >> 1979 >> Skyhawk Base, Automatic Trans >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Auxiliary Emission Control Systems >> Air Injection Reactor System >> Testing >> Functional Test

Functional Test

  1. Start engine and let idle in Neutral or Park. Feel for presence of air exhausting out of lower portion of diverter valve. There should be no air coming out.
  2. Seal off vacuum supply to diverter valve by pinching hose. Hold for at least one second, then release hose. Air should now be exhausting from bottom of diverter valve. It should do so for about 4 seconds. Replace diverter valve if air does not exhaust.
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