<P> A throttle is the mechanism by which fluid flow is managed by constriction or obstruction . </P> <P> An engine's power can be increased or decreased by the restriction of inlet gases (i.e., by the use of a throttle), but usually decreased . The term throttle has come to refer, informally and incorrectly, to any mechanism by which the power or speed of an engine is regulated, such as a car's accelerator pedal . What is often termed a throttle (in an aviation context) is more correctly called a thrust lever, particularly for jet engine powered aircraft . For a steam engine, the steam valve that sets the engine speed / power is often known as a regulator . </P> <P> In an internal combustion engine, the throttle is a means of controlling an engine's power by regulating the amount of fuel or air entering the engine . In a motor vehicle the control used by the driver to regulate power is sometimes called the throttle, accelerator, or gas pedal . For a gasoline engine, the throttle most commonly regulates the amount of air allowed to enter the engine . The throttle of a diesel regulates the fuel flow into the engine . </P>

Where is the throttle located on a car