A Throttle Body is the air control device for all spark ignition engines, carbureted and fuel-injected, located between the air intake and the air cleaner. It contains a valve that regulates the airflow through the intake manifold.
- The amount of air that enters a spark-ignition engine is primarily controlled by the driver moving the acceleration pedal. The operated pedal is linked through a linkage or cable ton the throttle valve in the throttle body.
- Depressing the accelerator pedal lets the throttle valve top open and allow fresh air from the air cleaner to enter the intake manifold
- Through a carburetor, the throttle valve functions to control the amount of air-fuel mixture that enters. The throttle valve controls only air if the engine has a port (multipin) or throttle body inspection
Some vehicles are equipped with an electronic throttle control or driver by wire system, which is used together with traction control; wherein a sensor on the accelerator pedals signals it position to the ECM (Electronic control module)
- The ECM now computes the proper opening of the throttle valves. Signals then are sent to small motors on the throttle body which enables the throttle valve to open and close as required., which helps prevent wheelspin during hand acceleration.