Grand AM L4-144 2.4L DOHC VIN T SFI (1997)
Throttle Body: Description and Operation
Throttle Body
Description
Notice: Numbers in text correspond to numbered components in image.
The throttle body (1) assembly is attached to the intake manifold. The throttle body 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.
Operation
During engine idle, the throttle valve is almost closed, and air flow control is handled by the Idle Air Control (IAC) valve (3). The throttle body
also provides the location for mounting the Throttle Position (TP) sensor (2) and provides a manifold vacuum source for various components.
Vacuum ports are located at the throttle valve to generate vacuum signals needed by various components.
