What causes intermittent shaking in the Wuling Hongguang S?
4 Answers
The intermittent shaking in the Wuling Hongguang S is primarily caused by excessive carbon buildup in the throttle body. Excessive carbon deposits in the throttle body can affect the engine's air intake, leading to symptoms such as cold idle shaking, unstable idle, and difficulty starting the vehicle. Taking the 2020 Wuling Hongguang S as an example, it is a microvan with the following dimensions: length 4390mm, width 1660mm, height 1750mm, and a wheelbase of 2720mm. It has a fuel tank capacity of 50 liters and a curb weight of 1185kg. The 2020 Wuling Hongguang S features a MacPherson strut front suspension and a leaf spring rear suspension. It is equipped with a 1.2L naturally aspirated engine, delivering a maximum horsepower of 76PS, a maximum power output of 56kW, and a peak torque of 110Nm, paired with a 5-speed manual transmission.
I've repaired quite a few Wuling Hongguang S models, and this intermittent shaking issue is quite common. The most frequent cause is the aging and cracking of engine mount rubbers. The rubbers used in this vehicle tend to harden and fail, causing engine vibrations to be directly transmitted to the cabin. Another common issue is with the spark plugs, especially after 20,000 to 30,000 kilometers of use. When the electrode gap widens or the ignition coils age, it can lead to occasional misfires and shaking in one of the cylinders. If the shaking occurs while driving, the main culprit is usually incorrect tire balance. Wheel rim deformation or lost balancing weights can cause this. Additionally, carbon buildup in the throttle body can lead to unstable air intake at low speeds, causing jerking. If you've recently refueled at a less reputable gas station, clogged fuel lines or dirty fuel injectors can also cause poor fuel delivery. I recommend first checking the engine mount rubbers and spark plugs, as these two account for over 80% of the fault cases.
As a long-time owner of the Wuling Hongguang, I've personally experienced such vibration issues. My car suddenly shook like a massage chair at a red light, then returned to normal after a few seconds. The mechanic found it was due to aging ignition coils, with one of the four cylinders working unstably. Replacing them solved the problem. Later, I also encountered body wobbling at 80 km/h on the highway, which was fixed by performing a four-wheel dynamic balance. Reminder: pay attention to the conditions under which vibrations occur—idling vibrations should first check engine mounts and spark plugs; acceleration vibrations, look at the fuel system; high-speed vibrations, focus on the tires. The exhaust manifold screws on Wuling vehicles are also prone to loosening, causing rattling noises and vibrations. Remember to clean the air filter regularly, as a dirty one affects air intake and can also cause shaking. Don't wait until the problem worsens to address it, as it can lead to damage to more expensive components.
Driving a Wuling for cargo hauling over five or six years, I've noticed that such vibrations are highly related to the usage environment. Long-term operation on construction sites leads to excessive dust accumulation in the engine bay, causing ignition coil leakage, which becomes more noticeable during the rainy season. Frequently driving on rough roads can loosen sensor connectors, and losing the crankshaft position signal will result in sudden jerks. Constant overloading accelerates the wear of engine mounts. Special attention should be paid to the fuel filter during maintenance, as fuel impurities in rural areas can easily clog it, leading to insufficient fuel supply and jerky vibrations. Carbon buildup is also a significant issue, especially for vehicles frequently used for short trips—the black sludge on the back of the throttle valve can affect idle stability. It's recommended to clean the throttle valve during each maintenance session and replace spark plugs every 30,000 kilometers to effectively prevent vibrations.
