Why does the Beidou Star have unstable idle speed when the air conditioner is turned on, fluctuating between high and low?
4 Answers
The reason why the Beidou Star has unstable idle speed when the air conditioner is turned on, fluctuating between high and low, is due to oil accumulation and carbon deposits in the car's throttle body. If there is oil accumulation and carbon deposits in the throttle body, it is necessary to promptly visit the car's 4S shop or a repair shop to clean the throttle body. Below are the relevant details: Specific reasons: Blockage in the intake tract can cause idle speed fluctuations, and carbon deposits or oil in the throttle body are the most common causes of unstable idle speed. Carbon deposits in the throttle body can affect its opening, impacting the air intake volume, causing the engine speed to fluctuate between high and low when the car is started cold, making it very unstable and accompanied by strong vibrations. Precautions: Severe oil accumulation or carbon deposits in the throttle body, including a dirty intake tract, can make it difficult to start the car in cold weather. A dirty throttle body needs to be cleaned, and throttle body cleaning itself is a routine maintenance item. Spark plugs can also accumulate carbon deposits, which can be cleaned to restore their activity, but some spark plugs may experience performance degradation as their service life nears its end. Weak sparks from spark plugs on individual cylinders can affect the car's performance. Generally, faulty spark plugs can cause the car to exhibit "misfire" symptoms.
I've experienced the same issue with my Suzuki Wagon R (Bei Dou Xing) where the idle speed fluctuates wildly when the AC is turned on. My previous car had this annoying problem too. It's most likely an issue with the idle control system - either the idle air control valve is clogged with carbon deposits and stuck, or the throttle position sensor is giving inaccurate signals. When the AC compressor load increases, the engine RPM goes haywire. Another possibility is aged vacuum lines leaking, causing intake and compression imbalance. In my case, I found the control valve was dirty - cleaning it solved the problem. I recommend going to a repair shop immediately to check and clean the throttle body, while also verifying the AC pressure. Regular maintenance of air filters and electrical systems during normal driving can prevent minor issues from becoming major headaches.
The Beidou Star (Wagon R) experiences unstable idle speed when the AC is on, which is commonly caused by faulty idle control components. Possible reasons include carbon buildup in the idle actuator causing sluggish response, distorted signals from the intake sensor, or the sudden power demand from the AC compressor overwhelming the engine ECU's regulation. Vacuum leaks can also cause erratic airflow and RPM fluctuations. I've diagnosed similar issues with an OBD scanner before—the data stream showed abnormal RPM compensation deviation. You can start by checking if the battery voltage is stable, as loose connectors can also cause problems. If that doesn't help, replacing the idle control motor isn't expensive. Remember to perform regular system self-checks as preventive maintenance.
My Beidou Star's idle speed jumps erratically when the AC starts, making me nervous while driving. The mechanic said it could be due to an old idle control valve or aging sensors - when the compressor kicks in, the engine load increases but the ECU's delayed response causes RPM fluctuations. Another possibility is poor electrical connections or aged/fused short circuits causing power instability. Don't take this lightly as it increases fuel consumption and affects driving safety. Last time I sent it for repair, they found the motor was broken - after replacement it ran smoothly again. Suggest going to a professional shop for comprehensive diagnosis to avoid accidents on the road.
