What are the symptoms of a faulty throttle body?

[ValentinaDella]

Symptoms of a faulty throttle body include: 1. The vehicle's malfunction indicator light turns on; 2. Unstable or no engine idle speed; 3. Difficulty in cold starting or abnormal engine shaking, accompanied by unusual noises; 4. Insufficient engine power, unstable operation, and poor acceleration performance; 5. Black smoke from the exhaust pipe and increased fuel consumption. The throttle body is a controllable valve that regulates the air entering the engine. After entering the intake manifold, the air mixes with gasoline to form a combustible mixture, which then burns to generate power. It connects the air filter at the top and the engine block at the bottom, often referred to as the 'throat' of the automobile engine. There are two types of throttle bodies: the traditional cable-operated type and the electronic throttle body. In traditional engines, the throttle body's operating mechanism works via a cable or rod, connecting the accelerator pedal on one end and the throttle linkage plate on the other. The electronic throttle body primarily uses a throttle position sensor to control the opening angle of the throttle based on the engine's energy requirements, thereby adjusting the amount of air intake.