Legend Coupe V6-2675cc 2.7L SOHC FI (1988)
Auxiliary Air Valve (Idle Speed): Description and Operation
Sedan
Description
To prevent erratic running when the engine is warming up, it is necessary to raise the idle speed. The fast idle air bypass valve is controlled by a
thermowax plunger.
Operation
When the engine is cold, the engine coolant surrounding the thermowax contracts the plunger, allowing additional air to be bypassed into the
intake manifold so that the engine idles faster. When the engine reaches operating temperature, the valve closes, reducing the amount of air
bypassing into the manifold.