What are the symptoms of a faulty electronic throttle body?

[CadenAnn]

Electronic throttle body failure may cause the engine warning light to illuminate, engine idle shaking and unstable idle, stalling at low speeds, and other phenomena. Here is relevant information: 1. Use a computer diagnostic tool to check the engine module. If there are no permanent fault codes, replacement is generally not required. Read the throttle body's data stream to check the two position sensors and throttle opening. If the opening is large, first clean the carbon deposits on the throttle body, then perform throttle initialization. 2. If the throttle position sensor and motor have poor line contact, open circuit, or short circuit, check the throttle wiring harness connector for rust, water ingress, or widened connector tabs in case of poor contact. For open or short circuits, inspect the related throttle wiring by measuring voltage and circuit continuity.

[MacJohn]

I had an issue with the electronic throttle when driving last year, and it felt really terrible. Right after starting the car, the yellow engine warning light on the dashboard would immediately come on, which always made me nervous. The engine idled roughly, shaking like it was trembling at red lights. Accelerating was especially difficult—I had to press the gas pedal deep before the car responded sluggishly, and it struggled even more on uphill roads. Cold starts often failed, and it almost stalled several times. I finally took it to the repair shop, and the technician said the throttle position sensor was faulty, causing abnormal voltage. I recommend getting it checked as soon as you notice these signs, or it could drag down overall performance and even increase fuel consumption.

[DeEleanor]

As a guy who often tinkers with cars, I've found that the most obvious symptom of an electronic throttle failure is the engine becoming sluggish. When you step on the gas pedal, you don't feel that instant power surge—it's more like dragging an old ox. The car may shake slightly with unstable idling, and the dashboard will light up a yellow warning light indicating the issue. Here's a simple way to confirm it preliminarily: start the car, put it in neutral, and observe if the tachometer shows abnormal fluctuations; if you connect an OBD2 scanner, it usually reads a throttle position sensor fault code. The main causes are carbon buildup blockage or internal wiring aging. Don't delay too long, or it might trigger limp mode to limit speed, affecting driving safety—better get it fixed promptly.

[Rob]

After driving for so many years, I can spot a faulty electronic throttle right away. The engine shakes excessively for no reason, especially noticeable when idling, causing significant vibrations inside the car. Pressing the accelerator feels weak, making it hard to overtake. The check engine light frequently comes on. These symptoms make driving very unsettling, and delaying repairs could damage other engine components. So at the first sign of issues, like unstable idling or delayed acceleration, get it checked at a professional shop immediately.

[GenesisRose]

Electronic throttle failure can lead to various abnormal symptoms. The most prominent is throttle response delay, where pressing the pedal results in a noticeable lag before the engine reacts. Idle speed becomes unstable, with increased engine vibration when the vehicle is stationary. Insufficient power during acceleration makes climbing hills particularly difficult. The engine malfunction indicator usually illuminates, sometimes accompanied by start-stop system failure. Possible causes include sensor malfunctions or motor damage. A simple diagnostic method is to check for unusual odors near the rear of the vehicle. Prompt attention is required to prevent damage to the vehicle's computer system.