What are the reasons for severe shaking when starting the car?

[StIsabel]

The reasons for severe shaking when starting the car: 1. Aging or loosening of engine mounts. Engine mounts are used to reduce vibration and provide cushioning during engine operation, as well as to secure the engine. Once these mounts age or become loose, the engine's vibration will become noticeably abnormal; 2. Engine misfire, which manifests as obvious intermittent exhaust gas flow from the car, along with shaking of the exhaust pipe, and noticeable engine vibration, sometimes accompanied by a sputtering sound; 3. Carbon buildup issues. When there is excessive carbon buildup inside the engine, the car's ignition energy decreases, intake efficiency drops, ultimately leading to symptoms like engine shaking and weak acceleration; 4. Intake system failure. If the air filter is not cleaned in time after long-term use and becomes clogged, insufficient air volume will result in an overly rich combustible mixture, causing a decrease in engine power.