What are the reasons for severe shaking of the Boyue when cold?
2 Answers
The reasons for severe shaking of the Boyue when cold are as follows: 1. Severe engine carbon deposits causing car shaking, which may be due to a dirty throttle or excessive carbon buildup in the fuel injectors. When there is too much carbon deposit inside the engine, the gasoline sprayed by the cold start injector will be largely absorbed by the carbon deposits, resulting in an excessively lean air-fuel mixture during cold starts and 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 will be sucked into the cylinder by the engine's vacuum suction force and burned, making the air-fuel mixture too rich. The engine's combustible mixture alternates between lean and rich, causing idle shaking after a cold start. Solution: The relevant parts need to be replaced or cleaned. 2. Unstable oil pressure leading to car shaking. Abnormal fuel pump pressure or incorrect and malfunctioning intake pressure sensor values can cause body shaking. Solution: The relevant parts need to be inspected and repaired. 3. Aging engine components, which may also include aging engine mounts. Engine mounts are responsible for absorbing minor vibrations when the engine is running. If the engine mounts are faulty, these vibrations will be transmitted to the steering wheel and the cabin, causing shaking during idle. Solution: The engine or engine mounts need to be replaced.
I've encountered a similar issue before. When cold-starting my Boruiyue, the car body shook violently, making the engine feel like it was dancing. The main cause could be excessive carbon buildup inside the engine—those residual deposits from combustion clogging the valves or fuel injectors, leading to uneven air-fuel mixture and unstable ignition. Another possibility is aged spark plugs or faulty ignition coils, which can cause delayed or unstable ignition. If the fuel pump pressure is insufficient or the gasoline filter is dirty, it can also lead to poor fuel supply and cause shaking. Additionally, a dirty throttle body or loose engine mounts can worsen the vibration. I suggest you first check these components. It's best to visit a repair shop for diagnostics—cleaning the carbon deposits or replacing the spark plugs can significantly improve the situation. Regular maintenance and avoiding too much low-speed driving can help reduce carbon buildup. Cold-start shaking not only affects driving comfort but can also damage engine components over time, so it's best to address it early.
