What is the function of the throttle valve?

[IslaAnn]

The function of the throttle valve is to control the air entering the engine. It connects to the air filter at the top and the engine block at the bottom, serving as a controllable valve that regulates air intake into the engine. After entering the intake pipe, the air mixes with gasoline to form a combustible mixture, which then burns to generate power. The cleaning steps for the throttle valve are: 1. Turn off the ignition switch and disconnect the negative terminal of the battery; 2. Remove the throttle cable, intake hose, and screws securing the throttle valve in sequence; 3. Clean the throttle valve with a cleaning agent, using a cotton swab to wipe areas that are hard to reach. The effects of a dirty throttle valve include: 1. Engine shaking during idle; 2. Insufficient power during driving; 3. Increased fuel consumption; 4. Engine stalling easily; 5. Failure to meet emission standards.

[HeidiFitz]

The throttle valve acts like the engine's throat, controlling the opening size of the intake pipe. When I press the accelerator pedal while driving, I can feel the throttle opening angle changing. The wider it opens, the more air enters, and the ECU coordinates by injecting more fuel, causing the engine RPM to soar. Unstable idle in older cars is mostly due to carbon buildup clogging the throttle body. The sludge sticks to the throttle plate like glue. Last time I cleaned the throttle, I found the gaps were full of black, greasy deposits. After cleaning, the throttle response became noticeably sharper.

[MalachiMarie]

This thing's core function is to regulate air flow, with the metal flap connected to the accelerator pedal. I remember one time when the car had throttle lag, and upon inspection, we found the throttle shaft was stuck by carbon deposits—just like trying to run in slippers, it wouldn't budge. Modern electronic throttles are smarter; they're not directly driven by cables. Instead, the ECU precisely controls the opening via an electric motor, automatically adjusting high idle speed when the engine is cold, and even coordinating with ESP to manage torque. Be mindful that prolonged use of 92-octane fuel can cause coking on the back of the flap, affecting the air-fuel mixture concentration.

[BellaLee]

Simply put, it's the engine's breathing valve. Our engineers prioritized response speed and sealing performance during design, with Teflon coating on the blade edges to reduce carbon buildup. It works in coordination with the intake pressure sensor - when the opening increases, the airflow velocity rises, and vacuum changes cause sensor signal fluctuations, allowing the ECU to adjust fuel injection pulse width accordingly. The biggest concern is poor fuel quality causing wear on the flap shaft; excessive clearance can lead to idle hunting.