What is the primary function of the throttle body?

The primary function of the throttle body is to control air intake. This component acts as a gateway for air entering the engine's intake manifold. When the driver presses the accelerator pedal, the throttle body opens to allow more air to enter the combustion chamber, which is essential for the engine to produce power. The amount of air that flows through the throttle body is directly related to the engine's performance and responsiveness.

This function is critical because an appropriate air-fuel mixture is necessary for efficient combustion. When the throttle body regulates how much air gets into the engine, it works in conjunction with the fuel system to achieve optimal performance and emissions compliance. Thus, the correct answer emphasizes the role of the throttle body in ensuring that the engine receives the right amount of air for combustion.