What are the reasons for difficult cold starts?

[VonOscar]

Reasons for difficult cold starts: 1. When there is excessive carbon buildup in the engine, the gasoline sprayed by the cold start injector is largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts, making it difficult to start; 2. The engine temperature is insufficient, and both the fuel and lubricating oil temperatures are too low. Poor fuel atomization at low temperatures leads to reduced ignition energy, thereby affecting performance and causing the car to shake. Precautions for difficult cold starts: 1. Pay attention to defogging: In winter, the significant temperature difference between the inside and outside of the car can cause fogging on the windows, which can be troublesome for driving; 2. Prevent icing: Frost and ice on the windows are extremely common in cold winters, mainly due to the large temperature difference between the inside and outside of the car.