What are the causes of engine vibration after a major overhaul of Chery engines?

[AndrewDella]

Chery engine vibration after a major overhaul can be caused by mechanical faults, as well as poor performance of components such as the throttle body, ignition system, and fuel supply system. Below are the specific reasons and solutions: Ignition system malfunction: Spark plugs, high-voltage wires, and ignition coils may exhibit unstable operation after a certain period of use. Solution: Inspect the condition of spark plugs, high-voltage wires, and ignition coils, and replace the spark plugs if necessary. Aging engine components: When the car's electrical system is turned on while the engine is idling, it increases the engine load, causing idle speed to drop. To compensate for the resulting vibration, the engine may automatically raise the RPM slightly. Solution: Replace the engine mounts.