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

[LeSavannah]

The reasons for engine shaking when starting the car are: 1. Low ignition energy due to cold engine temperature; 2. Inappropriate air-fuel mixture ratio; 3. Severe carbon buildup on engine valves and intake ports; 4. Uneven operation among engine cylinders; 5. Malfunctioning coolant temperature sensor. The function of the engine is: to convert the thermal energy of gasoline or diesel into mechanical energy by burning the fuel in a sealed cylinder, causing gas expansion that pushes the pistons to perform work. Engine maintenance methods include: 1. Regularly changing engine oil and filters; 2. Using lubricants of appropriate quality grades; 3. Periodically cleaning the radiator; 4. Regularly replacing air filters, oil filters, and fuel filters; 5. Maintaining good crankcase ventilation with regular cleaning; 6. Periodic cleaning of the fuel system.