System Components

Electric Air Control (EAC) Valve:

AIR CONTROL VALVE

This valve is a high flow electric air control valve that is equipped with an electric solenoid to combine electronic control with normal diverter valve function.
With ignition ``On'', the solenoid is energized through the control module and the air control valve operates like a diverter valve directing air to the exhaust manifold. During engine deceleration, when there is a rise in manifold vacuum, air is directed to the air cleaner or silencer even though the solenoid is energized. The solenoid is de-energized when there is a malfunction of the electrical circuit or high engine RPM over a prolonged period.

Deceleration Valve (DEC-V) Operation:

DECELERATION VALVE

The deceleration valve is used with the AIR system to help prevent backfiring during high vacuum conditions. Vacuum draws the mixture valve diaphragm down and opens the valve allowing air from the air cleaner to flow into the intake manifold. This air enters the air/fuel mixture to lean the rich condition created by high vacuum when the throttle valve closes on deceleration.
The vacuum draws the deceleration valve diaphragm down and opens the valve allowing air from the air cleaner to flow into the intake manifold.

SERVICE ENGINE SOON LIGHT

If there is a malfunction in the control module, wiring harness or solenoid(s), an amber "SERVICE ENGINE SOON" light will illuminate on the instrument panel. With ignition "ON" and the engine not running, the "SERVICE ENGINE SOON" light will come "ON" and stay "ON" for 1-2 seconds and then go "OFF" as a bulb check.