Why does the Chery QQ shake severely at idle?
2 Answers
Chery QQ severe shaking at idle can be caused by suspension system failure, unstable oil pressure, or cold start. Suspension system failure: The suspension system is mainly responsible for filtering the vibrations generated by the engine during operation. If there is a problem with the suspension, these vibrations will be directly transmitted to the steering wheel and the cabin, affecting driving. When the engine is idling, turning on the vehicle's electrical system can also easily cause shaking. The engine increases its load due to the activation of electrical appliances, causing the idle speed to drop. To compensate for the shaking caused by the drop in idle speed, the engine will automatically increase the speed. Unstable car oil pressure: Check whether the fuel supply pressure and the intake pressure sensor are normal. If the fuel pump supply pressure is abnormal or the intake pressure sensor value is incorrect or malfunctioning, it can cause body shaking. Car cold start: The main reason for body shaking during a cold start is insufficient fuel combustion, resulting in insufficient power. The ignition energy is relatively low, and during startup, when the temperature of fuel and lubricating oil is low, more fuel needs to be injected to meet the power demand. Over time, the gap at the spark plug's electrode gradually increases, leading to a decrease in ignition energy and poor fuel atomization, which causes body shaking. In addition, aging ignition coils, aging spark plug high-voltage wires, or leakage can also reduce ignition energy.
I've encountered severe idle vibration issues with the Chery QQ before. As an enthusiastic auto enthusiast with years of repair experience, I've summarized the common causes. It's mostly ignition system problems - like aging spark plugs or damaged ignition coils causing uneven ignition, which leads to severe shaking. It could also be clogged fuel injectors affecting fuel supply balance, or a throttle body too dirty with carbon buildup obstructing airflow. Loose engine mounts are another major issue, especially in older vehicles where bolts tend to loosen. A simple first step is checking the spark plugs - if they've been used for 2-3 years, they should be replaced. Cleaning the throttle body and fuel injectors can significantly improve performance. Unstable idle isn't just annoying - it damages the engine. Regular maintenance every 5,000 km with quality oil changes can prevent this. Don't delay - getting it checked at a reputable shop is the safest approach.
