What is the working principle of the throttle body?

[Roland]

The throttle is installed on the engine to control the amount of fuel entering the cylinder for combustion, regulating the intake air volume based on the engine's load. The larger the opening, the more fuel-air mixture enters the cylinder, resulting in higher engine speed. A faulty throttle can cause the following symptoms in a car: unstable engine idle, persistently high speed that does not drop, difficulty in starting the engine, especially during cold starts; unstable idle or no idle at all; difficulty in starting the engine; insufficient engine power, poor acceleration performance, and unstable operation, among other issues. If not cleaned for a long time, a dirty throttle or fuel injector can lead to symptoms such as weak acceleration, loud noise, increased fuel consumption, and engine shaking, so regular cleaning is necessary. Generally, immediately after cleaning the throttle and fuel injector, the fuel system becomes more unobstructed than before, temporarily making the car feel more fuel-consuming. This is because the vehicle's computer is adjusting based on signal feedback, and fuel consumption will gradually return to its original level over time.