Throttle Body: Description and Operation

Throttle Body Assembly:

DESCRIPTION
The throttle body assembly is mounted on the intake manifold and houses the throttle plate, fuel injector, fuel pressure regulator, temperature and position sensors, and the Automatic Idle Speed (AIS) motor.

OPERATION
Intake air flow is controlled by the cable operated throttle plate and by a separate air by-pass channel which is controlled by the AIS motor. Engine idle speed is controlled by the AIS motor by adjusting the amount of air passing through the air by-pass channel. At idle the throttle plate is closed. The throttle body provides the chamber for fuel metering, atomization, and mixing atomized fuel with incoming air.