What are the symptoms of a faulty idle motor?
2 Answers
The symptoms of a faulty idle motor are: 1. Unstable idle speed; 2. Surging; 3. Vehicle stalling; 4. Delayed acceleration; 5. Engine shaking. The idle motor is primarily responsible for maintaining the car's idle speed, adjusting it based on the engine load during idle conditions. The idle motor is installed on the car's throttle body and regulates the idle air passage area through a stepper motor, controlling the intake air volume of the engine's intake manifold. The intake pressure sensor transmits the detected intake pressure to the computer, which determines the intake volume or engine load, calculates the required fuel injection amount, and controls the engine's idle power.
The most obvious symptom of a faulty idle speed control motor is unstable engine RPM. During cold starts, the tachometer needle jumps erratically, and sometimes the engine suddenly stalls - especially noticeable when waiting at red lights, with the car shaking like a massage chair. When the AC is turned on, the RPM drops instead of rising, and in severe cases, the engine may stall directly, accompanied by the illumination of the check engine light. I once experienced fluctuating idle speeds myself, which turned out to be carbon buildup jamming the throttle valve. These issues should be addressed promptly - sudden stalling at traffic lights is dangerous and increases fuel consumption while damaging the engine. If abnormalities are detected, it's recommended to first read the trouble codes and try cleaning carbon deposits from the throttle body.
