Air Injection Control Valve: Description and Operation

Electric Air Control Valve:

PURPOSE
To control or divert air to either the exhaust ports or the atmosphere.

OPERATION
This valve is called an Electronic Air Control (EAC) valve, because it combines electronic control with normal diverter valve functions. When the solenoid is energized, the valve will perform similar to a standard diverter valve. Air from the pump is directed to the exhaust ports unless there is a sudden rise in manifold vacuum due to vehicle deceleration. When the solenoid is de-energized, the pressurized air from the air pump is allowed to enter the decel timing chamber. This places sufficient pressure on the valve diaphragm to overcome spring pressure, which allows air to divert to the atmosphere. At high engine speeds, excess air is allowed to exhaust to atmosphere through the pressure relief valve.