Air Injection: Description and Operation

Fig. 13 Dual Air Injection System, 1981 Except Eagle & 1982 All Models:

These systems consist of a belt driven air pump, diverter valve, air switch valve, air injection manifold, "downstream" air injection tube and connecting hoses. This system has two locations for air injection; one is at the exhaust ports, and the other is at the catalytic converter.

This system also uses a reverse delay valve, two way delay valves and divert solenoid, and [1][2]upstream solenoid that controls the air switch valve operation which is open by the open Loop 2 (0L2) mode of the CEC system.

Additional components used with the dual air injection system are:

1. divert and up-stream solenoids
2. air switch valve
3. reverse and two-way delay valves
4. downstream air injection tube. This tube injects air to the dual bed catalytic converter.

The air by-pass circuit operating vacuum is regulated by the divert solenoid, Open Loop 3 vacuum switch (feedback system) and two way reverse delay valves. The divert solenoid is grounded through the feedback system. When current flows through the circuit, the energized solenoid allows atmospheric pressure to displace the vacuum, allowing the diverter valve to release system air pressure to the atmosphere.

The two way and reverse delay valves are used to prevent a sudden loss of vacuum during a rapid vacuum decrease engine operating condition (acceleration).