Impreza 2.5 RS Sedan AWD F4-2.5L SOHC (2002)
Throttle Body: Description and Operation
Throttle Body
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In response to operation of the accelerator pedal, the throttle valve in the throttle body opens/closes to regulate the volume of the air drawn into the
combustion chamber.
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During idling, the throttle valve is almost fully closed and the volume of air passing through the throttle body is less than that passing through the
idle air control solenoid valve.
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More than half of the air necessary for idling is supplied to the intake manifold via the idle air control solenoid valve which controls properly the
engine idling speed, so the idling speed needs not be adjusted.
