What causes high idle speed in Wuling Hongguang?
3 Answers
Wuling Hongguang high idle speed reasons are: 1. Because impurities accumulate during the intake process, these impurities gradually build up on the throttle valve plate over time, forming increasing carbon deposits. When the throttle valve moves back and forth, it encounters resistance. Prolonged operation under these conditions causes the engine ECU to adjust the throttle valve plate position. This means the carbon deposit position is treated as the default position, effectively preventing the throttle valve from fully closing to its intended position. 2. After cleaning the intake valve, if the valve plate still follows its original movement pattern, it's equivalent to not closing completely - but now without the carbon deposits. This results in more air intake than normal, causing high idle speed. 3. In this situation, ECU reprogramming is required. Without reprogramming, it would take extended driving for the engine ECU to readjust and restore normal operation.
High idle speed issues are quite common on the Wuling Hongguang. I've repaired many of these models, and usually start checking from the simplest areas. Throttle body carbon buildup is the most common culprit - excessive dust can jam the throttle components, preventing RPM from dropping. It's best to clean the throttle body every six months. Another frequent cause is a faulty idle speed motor (also called idle air control valve), which allows uncontrolled air intake and causes RPM to surge. Additionally, a clogged air filter restricts engine airflow, prompting the ECU to automatically increase RPM as compensation, so regular air filter replacement is crucial. If these components check out fine, you'll need to inspect sensors - faulty intake or temperature sensors, or vacuum hose leaks can all mislead the engine computer into thinking higher RPM is necessary. Untreated high idle speed not only wastes fuel but also increases engine load and shortens lifespan. I recommend getting a diagnostic scan at an auto repair shop first, rather than attempting DIY disassembly that might damage other components.
I've been driving a Wuling Hongguang for several years and have encountered high idle speed issues. The first time it happened, the RPM surged above 1500, which panicked me and I immediately pulled over to check. Most likely, it was due to dust or oil buildup in the throttle body, preventing the engine from returning to normal idle, causing the RPM to stay high. A dirty air filter can also cause this because restricted airflow makes the engine compensate by increasing RPM. Another reason could be a faulty idle speed control valve, which regulates air intake—if it's worn or stuck, the idle speed becomes uncontrollable. Faulty sensors, like the oxygen sensor, can also mislead the ECU into misjudging engine needs. Fixing it isn't too hard: first, check if the air filter needs replacement; if that doesn't work, take it to a shop to scan for trouble codes to avoid guesswork. High idle speed not only wastes fuel but also accelerates engine wear and affects driving stability. Regular maintenance of the throttle body and air filter can prevent this. If high idle speed occurs suddenly while driving, slow down, pull over safely, and arrange for repairs.
