What causes the engine of Wuling Hongguang S3 to shake at idle?
2 Answers
There are several reasons for shaking at idle: 1. Poor fuel quality. If you refuel at small gas stations that are not affiliated with major oil companies, the poor fuel quality can cause this issue. Switching to better quality fuel should resolve the problem after some time, and the engine warning light might come on in such cases. 2. Cold weather. After starting the car, let it warm up for a longer time before driving. 3. Issues with idle adjustment or a slightly dirty throttle body. Remove the rubber pipe in front of the throttle body and clean it. Extension: The most common cause of car shaking is a dirty throttle body or excessive carbon deposits in the fuel injectors. When there is too much carbon buildup inside the engine, the gasoline sprayed by the cold start injector is largely absorbed by the carbon deposits, leading to an overly lean air-fuel mixture during cold starts, making it difficult to start. In this situation, the car will only start easily once the carbon deposits have absorbed enough gasoline to become saturated. After starting, the gasoline adsorbed on the carbon deposits is then sucked into the cylinder by the engine's vacuum for combustion, making the air-fuel mixture too rich. The engine's combustible mixture alternates between being too lean and too rich, causing idle shaking after a cold start.
My Wuling Hongguang S3 used to shake non-stop at idle, and it took me a long time to figure out the reason. This is usually an issue with the ignition system, such as aging spark plugs or faulty ignition coils causing unstable current, leading to irregular cylinder operation. Fuel system problems like clogged fuel injectors causing uneven fuel spray, or deteriorated engine mount rubber reducing shock absorption can also be culprits. Additionally, excessive carbon buildup or a dirty throttle body can disrupt the proper air-fuel mixture. If the engine mounts are unstable, the shaking becomes more pronounced. I remind myself to regularly inspect and replace wear-prone parts, especially during frequent city stop-and-go traffic. A simple fix is to clean or replace the air filter or install new spark plugs. If that doesn’t work, it’s best left to a professional repair shop. Never skimp on routine maintenance—minor issues waste fuel, while major ones can damage the engine.
