What are the symptoms of a faulty idle motor?
2 Answers
The symptoms of a faulty idle motor include: 1. The car may sometimes fail to start, stall at idle, or start intermittently, but runs normally after starting and accelerating; 2. Unstable or shaky idle; 3. Excessively high engine idle speed; 4. Excessively low engine idle speed; 5. A faulty idle motor may also cause slow acceleration and poor performance. If the engine stalls immediately upon entering idle, this is referred to as having no idle. The causes of this issue are generally a damaged idle motor or its wiring, a leaking vacuum tube in the brake vacuum booster, a torn diaphragm in the brake vacuum booster, a leak in the intake manifold, or a problem with the idle control module in the engine's electronic control unit.
When I previously encountered an idle motor failure, the car performed very unstably. At idle, the engine speed fluctuated up and down like a roller coaster, and the dashboard needle swung back and forth. Starting the car was also difficult; on cold mornings, it took several attempts to get it running, and fuel consumption increased sharply. The shaking was particularly noticeable at traffic lights, with a buzzing sound inside the car. In severe cases, it would stall directly, making it impossible to drive. I suspect carbon buildup clogged the control valve. Long-term accumulation of carbon deposits can easily lead to this issue, so regular cleaning is necessary. Don't wait until something goes wrong to fix it—safety first.
