What is the principle of the idle motor?

[VanLola]

The working principle of the idle motor is that the vehicle's computer collects engine operating condition data, calculates the optimal parameters, and transmits them to the idle motor. The idle motor then controls the size of the throttle's idle air passage to ensure stable engine operation. Since the idle motor regulates idle air flow, it is prone to getting dirty. Excessive dust entering the idle motor can impair its precise control and may even cause damage. If the idle motor fails, it will affect the car's idle operation, leading to issues such as difficulty starting, unstable idling, idle shaking, stalling at idle, and sluggish acceleration. If the idle motor is damaged, it should be replaced promptly. However, regular cleaning is crucial to prevent the buildup of carbon deposits and dust. As the idle motor is a precision component, cleaning requires positioning the motor's conical head downward and spraying cleaning agent onto the conical head and sleeve area to remove carbon deposits, followed by wiping it clean. This prevents cleaning agent from entering the motor's interior and causing damage.

[LaLilliana]

The working principle of the idle speed motor is actually quite simple, and I'll explain it based on my own experience. Essentially, it's a small motor installed near the engine, controlled by the computer to regulate air flow. When the engine is idling, such as at a red light, the computer sends commands to the motor based on data from the RPM and temperature sensors. The motor then adjusts the valve opening slightly to ensure the right amount of air enters, preventing erratic idle speeds or stalling. I've seen many cars with rough idling due to carbon buildup blocking this valve. If not cleaned in time, it can increase fuel consumption and damage the engine. It's recommended to check for oil and dirt buildup every 20,000 to 30,000 kilometers. Overall, it's like a little assistant working in the background, quietly ensuring a smooth drive.

[DiAdeline]

I've just studied the idle speed control valve. Its principle is that the motor, upon receiving signals from the ECU, precisely moves the valve to adjust the bypass air passage size, thereby controlling idle airflow. For instance, during cold starts, the valve opens wider to increase RPM for warm-up, then closes slightly once the engine reaches normal temperature to maintain stability. If it malfunctions—say, the valve gets stuck—the idle becomes unstable or may even cause stalling, often requiring cleaning or part replacement. This design is quite ingenious, dynamically adjusting to maintain engine efficiency and prevent fuel wastage during idling. If you notice abnormal idle speeds while driving daily, check this component promptly. Delaying could turn a minor issue into a costly major repair.

[DeAlana]

In principle, the idle speed motor is controlled by the computer to finely adjust the air valve position, ensuring stable engine idle. If carbon buildup causes the valve to not close tightly, the RPM will fluctuate erratically. Cleaning with a specialized spray solution can improve this. It acts like a car's regulator, preventing stalling issues when parked—simple, practical, and worry-free.