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Home >> American Motors >> 1978 >> Gremlin Base, Standard Trans >> Repair and Diagnosis >> Engine Mechanical >> Auxiliary Emission Control Systems >> Air Guard System >> Testing >> Diverter Valve

Diverter Valve

  1. Start and run engine at idle. Check diverter vents. Little or no air should flow from vents.
  2. Accelerate engine to 2000-3000 RPM and rapidly close throttle. A strong flow of air should pass from diverter vents for approximately 5 seconds.
  3. The high flow diverter valve used on some engines should vent for approximately 3 seconds. If air does not flow or if backfire occurs, make certain vacuum sensing line has vacuum and is not leaking.
  4. Slowly accelerate engine. Between 2500 and 3500 RPM air should begin to flow from diverter vents. The diverter valve is not serviceable and must be replaced if defective.
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