What Causes Severe Shaking When Starting the Car?

1 Answers
IsabelAnn
07/24/25 5:08pm
Reasons for severe shaking when starting the car: 1. Poor fuel quality: Inferior fuel has poor volatility, especially in winter when temperatures are low. During cold starts, the engine block temperature is low, making it difficult for the fuel to atomize. This results in insufficient mixing of fuel and air in the cylinders. 2. Severe carbon buildup in the engine valves and intake manifold: Carbon deposits can absorb an appropriate amount of fuel, causing the electronic control unit to make incorrect judgments. 3. Spark plug failure: When starting the car, 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 causes the car body to shake. Aging ignition coils, high-voltage wires of spark plugs, or electrical leakage can also reduce ignition energy.
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