Tracker 2WD L4-2.0L VIN C (1999)
Throttle Body: Description and Operation
Throttle Body Assembly
The throttle body assembly is located on the right side of the engine compartment between the air inlet duct and the intake chamber. The throttle body
assembly contains the following:
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Throttle Valve
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Idle Air Bypass Passage
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Air Limiting Valve
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Engine Coolant Passage
The throttle valve is interlocked; with the accelerator pedal by the accelerator control cable. The throttle valve controls the large volume of air that is
drawn into the intake chamber. The idle air bypass passage provides air for the control of engine speed when the throttle valve is closed. The air limiting
valve provides additional bypass air to engine when the engine is cold. The air limiting Valve is a bi-metal spring that is preset at the factory and cannot
be adjusted. The air limiting valve is not serviced separate from the throttle body assembly. The throttle body is warmed by engine coolant that flows
through the idle air control valve and into a coolant passage located in the throttle body. The warming of the throttle body helps prevent throttle valve
icing. Attached to the throttle body are the Throttle Position (TP) sensor and the Idle Air Control (IAC) valve.
