What is a throttle body?
The throttle body
in fuel injected engines, like in a car, is part of the air intake system. It regulates the air entering the engine depending on the pressure on the accelerator pedal.
In general, throttle bodies
are located between the air filter
and the intake manifold.
The throttle inside the throttle body
is in fact a butterfly valve. When you press the accelerator pedal, the throttle plate starts to turn around inside the throttle body allowing air to flow into the intake manifold. Although most cars have only one throttle body, it is possible to have more, especially in high-performance cars. There are even types of BMW for example which have one throttle body per cylinder.