What is the function of the throttle body in an engine?

The throttle body plays a crucial role in controlling the amount of air that enters the engine, which is essential for the engine's performance and efficiency. It operates in response to the driver's accelerator input. When the accelerator pedal is pressed, the throttle body opens, allowing more air to flow into the engine, which creates a richer air-fuel mixture for combustion. Conversely, when the accelerator pedal is released, the throttle body closes, restricting airflow and reducing engine power.

This precise regulation of air intake not only influences engine power output but also impacts fuel efficiency and emissions. The throttle body is often integrated with electronic components in modern vehicles, allowing for more responsive and accurate control compared to traditional mechanical systems. Understanding this function is fundamental for diagnosing performance issues related to air intake and fuel mixture.