What Causes Engine Idle Shaking?

[JayceLee]

Causes of idle shaking include severe engine carbon buildup, ignition system issues, unstable oil pressure, and aging engine components. The details are as follows: 1. Severe engine carbon buildup: Excessive carbon deposits 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. The main causes of carbon buildup are poor driving habits, such as prolonged idling, aggressive acceleration and braking, low-quality fuel, driving at high gears with low speeds, and lack of regular maintenance. 2. Ignition system problems: When certain components or wiring in the car's ignition system experience open circuits, short circuits, insufficient primary current, low secondary voltage, or failed ignition timing adjustments, the engine may run unevenly. This results in poor acceleration, reduced power and fuel efficiency, and idle shaking. 3. Unstable oil pressure: Many factors can cause unstable engine oil pressure, such as insufficient oil, dirty oil, thinning oil, oil pipe leaks, oil pump damage, or excessive wear of its components. If the engine continues to operate under low oil pressure, severe cases may lead to "bearing seizure," making the engine unable to start and requiring bearing replacement or repair.