Topaz V6-182 3.0L (1992)
By-Pass Air (BPA) Valve: Description and Operation
PURPOSE
The Idle Air Control (IAC) valve controls engine idle speeds, both cold and warm engine conditions.
CONSTRUCTION
Three types of IAC valves are applicable:
Hitachi Idle Air Control (IAC) Valve And Solenoid
Hitachi Idle Air Control (IAC) Valve And Solenoid
Nippondenso Idle Air Control (IAC) Valve Assembly
OPERATION
The valve allows a monitored amount of air to pass around the throttle plate to control the following:
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Fast idle for cold engine start-up
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Idle dashpot
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Start-up without pumping the accelerator pedal
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Idle speed increase for an overheat condition