Reasons for Severe Vibration During Car Startup

1 Answers
XavierAnn
07/30/25 8:40am
Reasons for severe vibration during car startup are as follows: 1. Poor fuel quality: Inferior fuel has poor volatility, and when starting a cold engine, the low temperature of the engine block causes the fuel injected into the cylinders to not mix sufficiently with air, leading to difficult startup and severe body vibration. 2. Carbon buildup on engine valves and intake manifold: Carbon deposits can absorb an appropriate amount of fuel, causing the electronic control unit to make incorrect judgments and fail to achieve the required power, resulting in vibration. 3. Spark plugs: During car startup, especially when the temperatures of fuel and lubricating oil are low, more fuel is needed to meet power demands. Over time, the electrode gap of the spark plugs gradually increases, leading to reduced ignition energy and poor fuel atomization, which in turn causes body vibration.
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