What is the function of an engine's throttle body?

The throttle body plays a crucial role in regulating engine performance by controlling the amount of air that enters the engine's intake manifold. It consists of a plate that opens and closes in response to the driver's input on the accelerator pedal. When the pedal is pressed, the throttle plate opens, allowing more air into the engine, which in turn increases engine power and efficiency. This precise control over air intake is vital for maintaining the correct air-to-fuel ratio required for optimal combustion and overall engine operation.

Understanding the function of the throttle body is essential for diagnosing issues related to engine performance, such as poor acceleration or increased emissions, which can result from a malfunctioning throttle body.