How to Solve High Idle Speed in Wuling Sunshine?
2 Answers
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.
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.
