* Throttle valve: The throttle valve is a movable flap that controls the amount of air flowing through the engine. In a carburater, the throttle valve is located in the venturi, while in throttle body injection, it is located in the throttle body.
* Fuel injector: The fuel injector is a device that sprays fuel into the engine. In a carburater, there is no fuel injector, since fuel is drawn into the engine by the vacuum created by the venturi. In throttle body injection, the fuel injector is located in the throttle body.
* Air intake manifold: The air intake manifold is a passage that connects the throttle body to the engine's cylinders. In a carburater, the air intake manifold is heated to help vaporize the fuel, while in throttle body injection, it is not heated.
