In a traditional spark ignition gasoline engine, the throttle body is the part of the air intake system that controls the amount of air that flows into an engine's combustion chamber. It consists of a housing unit that contains a throttle plate (butterfly valve) that rotates on a shaft.
When the accelerator pedal is pushed down, the throttle plate opens and allows air into the engine. When the pedal is released, the butterfly closes and effectively chokes off (throttles) air flow into the combustion chamber. This process effectively controls the speed of the engine and ultimately, the speed of the vehicle.

Typically located between the air filter and the intake manifold, the throttle body contains the delicate throttle system which controls a key component of spark ignition: air flow. Part of the atomization process, airflow helps regulate the air-fuel mixture ratio required to ignite an engine.

The primary regulator for throttle pressure comes in the form of the throttle body temperature sensor, which measures the temperature of the air-fuel mixture entering the fuel injection system of your car. This necessary regulation helps spark ignitions generate the most fuel efficiency.

Largely controlled by the butterfly valve known as the throttle plate, airflow is regulated by the driver via pressing on the acceleration pedal inside the vehicle. This reacts to a sensor on the throttle bottle which tells it to allow more air into the combustion chamber, increasing REM and power output. This makes the car, in turn, go faster.

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