What Causes the Car Body to Shake During Ignition?

1 Answers
McMackenzie
07/29/25 3:31pm
There are several reasons why a car may shake suddenly during ignition: 1. Poor fuel quality: In winter, the lower temperatures make it difficult for the fuel to atomize when starting a cold engine, leading to insufficient mixing of fuel and air in the cylinders, which causes difficulty in starting and severe shaking of the car body. 2. Spark plugs: The gap between the electrodes of the spark plugs gradually widens, reducing ignition energy and impairing fuel atomization. 3. Ignition coils: Aging ignition coils, high-voltage wires of the spark plugs, or electrical leakage can decrease ignition energy. 4. Carbon buildup on engine valves and intake manifold: Carbon deposits can absorb a certain amount of fuel, causing the electronic control unit to miscalculate. For example, while the unit may command the injection of 100 units of fuel-air mixture, only 90 units actually reach the cylinder. Even if the remaining 90 units burn completely, the required power output is not achieved, leading to unavoidable shaking.
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