Outback [Legacy] AWD F4-2.5L DOHC (1996)
Throttle Body: Description and Operation
THROTTLE BODY
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The throttle body is equipped with two throttle cams. One cam is used during acceleration and the other during cruising, in order to open or close
the throttle valve.
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These cams operate independently of each other. In other words, while one cam operates, the other does not.
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In response to the depressing stroke of the throttle pedal, the throttle body opens/closes its valve to regulate the air volume to be taken in the
combustion chamber.
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During idling, the throttle valve is almost fully closed and the air flow through the throttle body is less than that passing through the carburetor.
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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.
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And the idle air control solenoid valve properly controls the engine idle speed, so it does not need to be adjusted.