Diverter Valve

NOTE: The diverter valve is not serviceable and must be replaced if defective.

Start engine and operate at idle speed. Examine diverter valve vent. Little or no air should flow from vent.
Accelerate engine to 2000-3000 RPM and rapidly close throttle. A strong flow of air should pass from diverter valve vent for approximately 3 seconds. If air does not flow or if engine backfires, ensure that vacuum source is good and that there is no vacuum leaks.
NOTE: When manifold vacuum of 20 in. Hg or more is applied to the diaphragm, diverter valve should divert and vent output air from air pump. Valve should also vent when air pump output exceeds 5 psi (.35 kg/cm² )
Slowly accelerate engine. At approximately 2500-3500 RPM, air should begin to flow from diverter valve vent. If vacuum is present at valve, and it does not function as described in step 2), replace diverter valve.