Air Control Valve

Air control valve reacts to vacuum levels (which indicate engine loads) to direct air pump air either into injection manifold or back to the inlet side of air pump. On vehicles with automatic transmissions, air control valve contains 1 relief valve.

Vehicles equipped with manual transmissions use an air control valve with 2 relief valves. One relief valve is closed during low engine load conditions to direct normal air flow into exhaust system. Under high load conditions, it opens to return air flow to the air pump. The second relief valve modulates amount of air reaching exhaust system according to engine loads.

Fig 1: Reed Valve Type Air Injection System Used on 2.0L Federal Engines

Courtesy of FORD MOTOR CO.

Uses reed valve, air manifold and sleeve.