Throttle Body: Description and Operation

Purpose
The throttle body controls air flow to the engine.

Operation
A single lever and accelerator cable rotates the throttle shaft from idle to Wide Open Throttle (WOT) position.

^ The plate position at idle is set by the lever contacting a throttle return control screw. The throttle return control screw setting is permanent. Do not attempt to adjust idle/minimum plate setting with the throttle return control screw.

Construction

^ The throttle body is a single piece die casting made of aluminum.

^ The throttle body has a single bore with an air bypass channel around the throttle plate. This bypass channel controls both cold and warm engine idle airflow control as regulated by an Idle Air Control valve (IAC) valve mounted directly to the throttle body.






Features

^ a preset stop to locate the Wide Open Throttle (WOT) position.

^ a throttle body mounted Throttle Position Sensor (TPS) which produces an electrical signal and is used as an input to the powertrain control module.

^ a sealant applied to the downstream side of the throttle plate and bore to reduce plate-to-bore leakage. The sealant should not be removed when cleaning.