SW L4-1.9L DOHC VIN 7 (1993)
Throttle Body: Description and Operation
Throttle Body Exploded View.
OPERATION
The throttle body assembly is attached to the intake manifold air plenum, and is used to control air flow into the engine, thereby controlling engine
output. The throttle valve within the throttle body is opened by the driver through the accelerator controls. During engine idle, the throttle valve is
almost closed, and air flow is controlled by the idle air control (IAC) valve. To prevent throttle valve icing during cool weather operation, engine
coolant is directed through the coolant cavity in the intake manifold. The throttle body also provides the location for mounting the throttle position
sensor (TPS). Vacuum ports are located above or below the throttle valve to generate vacuum signals needed by various components.
COMPONENTS
1. Throttle Body Assembly.
2. Idle Air/Vacuum Signal Housing Assembly.
3. Idle Air Control (IAC) Valve Assembly.
4. Throttle Position Sensor (TPS).
