How to Solve High Idle Speed in Wuling Sunshine?

[DeBarrett]

Solutions for high idle speed in Wuling Sunshine: 1. Check throttle opening: For most electronically controlled engines, when the engine reaches normal temperature and the idle valve is fully closed, the basic idle speed is set to 500±50r/min. If the basic idle speed is too high, check the vacuum sealing of the system, especially the sealing of the vacuum tube, PCV valve, and related parts of the crankcase. 2. Check the engine load signal: At this time, connect the idle control valve. Under normal engine operating temperature, its opening should be between 15%-25%. If the idle control valve opening is too large, check whether the engine load signal is normal, such as the air conditioning signal, battery voltage, and the temperature value of the water temperature sensor. 3. Check the vacuum degree of the intake manifold: Under normal engine idle conditions, the vacuum degree of the intake manifold should be 57-71kPa. If the vacuum degree is too low, it will cause abnormal pressure signals in the engine intake system. At this time, the engine computer will mistakenly think that the load has increased, thereby increasing the idle speed. 4. Reset the engine computer: The so-called reset of the engine computer is to clear the fault memory in the engine computer and let it relearn the idle speed. 5. Check whether the throttle is fully closed during idle speed and whether the throttle cable is stuck: Push the throttle arm in the closing direction. If the engine idle speed can drop to the normal speed, it means the throttle is stuck and not fully closed; if the throttle cable is stuck, replace the cable; if the throttle shaft is stuck, disassemble and clean the throttle body. 6. Readjust the idle speed program: Readjust the idle speed according to the specified procedure of the engine. If the adjustment is ineffective, further inspection should be performed.

[DeNolan]

I've been driving the Wuling Sunshine for several years and encountered high idle speed issues, with RPM often reaching 1500 or even higher, which is quite annoying. Generally, carbon buildup in the throttle body is the main cause—excessive throttle opening leads to too much air intake. I cleaned the throttle body myself: removed the intake pipe, sprayed specialized cleaner, and wiped it clean. At the same time, I checked if the idle speed motor or control valve was stuck or damaged; if movement wasn’t smooth, it needed replacement. After cleaning, I reset the ECU to relearn the idle position by disconnecting the negative battery terminal for a few minutes and reconnecting it. If the problem persists, it might be due to a too-tight throttle cable or sensor misreporting. High idle speed not only wastes fuel but can also damage the engine, so it's best to address it early. If you can’t fix it yourself, take it to a repair shop for a professional to check the wiring or perform a computer diagnosis. Remember, don’t let carbon buildup linger and cause bigger problems.

[McKaylee]

I often repair my car by myself and have a solution for the Wuling Zhiguang's high idle speed. First, check if the throttle body is dirty. If there's sludge stuck, just buy a cleaning kit and spray it clean. Then, see if the idle speed control valve is working properly. If it's stuck, remove it for cleaning or simply replace it, which only costs around a hundred bucks. Don't forget to reset the ECU's idle speed settings: turn off the engine, disconnect the negative battery cable for ten minutes, then reconnect and start the car to let the computer relearn the position. If the throttle cable is too tight, it can also raise the idle speed, so just loosen and adjust it appropriately. Regular maintenance of these parts can prevent problems, saving money and being efficient. Once fixed, the engine will run quietly and smoothly. The DIY process is simple and doesn't take much time, with detailed tutorials available online to follow.

[Doris]

Use an OBD diagnostic tool to scan and read the fault code, such as P0507, to easily locate the root cause of the excessively high idle speed in the Wuling Zhiguang. Common issues include a faulty idle air control valve or throttle position sensor causing signal errors. Check if the valve body moves smoothly or if there is carbon buildup blocking it, then clean or replace it as needed. Resetting the ECU can quickly adjust the idle speed settings; try disconnecting the power to restore factory settings. If the sensor is faulty, use an instrument to calibrate it to avoid misjudging excessive air intake. Ensure all connectors are secure to prevent aging wiring from causing poor connections and abnormal engine speed.