What are the symptoms of a faulty throttle in a van?

[DanielFitz]

Related introduction is as follows: 1. Symptoms of throttle failure: (1) Unstable engine idle speed, high idle speed persists and does not drop, difficulty in engine starting, especially cold starting. (2) Unstable engine idle speed or no idle speed. (3) Difficulty in engine starting. (4) Insufficient engine power, poor acceleration performance, and unstable operation. 2. Causes: If the throttle position sensor is damaged, it will cause engine shaking and unstable idle speed. Because the throttle position sensor detects the signal of throttle opening. The engine computer adjusts the fuel injection amount and ignition timing based on the throttle opening. If the throttle sensor is faulty, the engine computer cannot correctly receive the throttle opening signal, resulting in the inability to accurately adjust the fuel injection amount and ignition timing. In severe cases, the engine may not start if the throttle is faulty.