Diverter Valve Test

Disconnect one air hose from diverter valve. Operate engine at a steady speed (approximately 1500 RPM) and check for a flow of air from outlet of valve. If no air flow is detected, check for flow of air through diverter valve exhaust ports. If air exhausts continuously, valve is faulty and should be replaced. With engine operating at a steady 1500 RPM, remove vacuum hose from diverter valve and make sure vacuum is present. Reconnect vacuum hose to valve and check for momentary stoppage of air flow from outlet and a simultaneous flow of air from exhaust ports. After a few seconds a flow of air from outlet should be restored. This indicates a normal operation of diverter valve. If valve fails test, replace.