What Causes Engine Vibration at Idle Speed?

[McPaige]

The reasons for engine vibration at idle speed are as follows: 1. Severe engine carbon deposits: Excessive carbon buildup in the engine can lead to poor engine performance, increased fuel consumption, and even difficulty starting. Over time, this can cause significant damage to the vehicle. 2. Issues with the ignition system: When certain components or circuits in the car's ignition system, such as the ignition coil, experience open circuits or short circuits, resulting in insufficient primary current, low secondary voltage, or failed ignition timing adjustment, it can cause unstable engine operation. This leads to deteriorated acceleration performance, reduced power and fuel efficiency, and also results in idle speed vibration.