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( Throttle body)
In a fuel injection engine, the throttle body is the part of the air intake system that controls the amount of air flowing into the engine, in response to driver input. While the accelerator is often called a "gas pedal", it would be more accurate to describe it as an "air pedal". The throttle body is usually located between the air filter box and the intake manifold, and usually attached to, or near, the mass airflow sensor. The largest piece inside the throttle body is the throttle plate, which is a butterfly valve that regulates the airflow. On many cars, the accelerator pedal motion is communicated through the throttle cable, which activates the throttle linkages, which moves the throttle plate. In cars with electronic throttle control (also known as "drive-by-wire"), an electric motor controls the throttle linkages and the accelerator cable connects not to the throttle body but to a sensor. The Engine Control Unit (ECU) determines the throttle opening. On some modern cars, the accelerator cable is replaced by a pedal position sensor, which sends the pedal position to the ECU.
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