It's so cold that the car won't start. What is the reason?

1, too much carbon deposit leads to frequent failures.

When there is too much carbon deposit in the engine, the gasoline sprayed by the fuel injection head will be absorbed by the carbon deposit during the cold start, resulting in too thin mixture during the cold start, which makes it difficult to start, and it is easy to crash until the gasoline absorbed by the carbon deposit reaches saturation.

After landing, the gasoline adsorbed on it will be sucked into the cylinder by the vacuum suction of the engine for combustion, which will make the mixture rich, and the combustible mixture of the engine will be diluted and concentrated, resulting in idling jitter after cold start.

2. The engine temperature is low.

The temperature in the engine is not enough, and the temperature of fuel and lubricating oil is not enough, so more fuel should be sprayed during cold start to meet the power requirements. Poor fuel atomization at low temperature leads to the reduction of ignition energy, which affects the dynamic performance and makes the car shake. Aging of ignition coil, aging of spark plug high voltage line or leakage will also lead to the decrease of ignition energy.

Extended data:

Matters needing attention when starting a cold car is difficult;

1, pay attention to defogging. In winter, the temperature difference between the inside and outside of the car is large, and the fog on the car glass will bring a lot of trouble to driving, especially the front windshield and the front left and right windows. Therefore, it is particularly important to keep the glass clear when driving in foggy days in winter, and clean the glass before going out.

2. Prevent icing. It is very common for glass to frost and freeze in cold winter, which is mainly caused by the large temperature difference between inside and outside the car. If it is cleaned with hot water, it will damage the car paint, and in serious cases, it may cause the glass to burst. Using cold water will also damage the car paint, and then frosting may be more serious. The correct way should be to turn on the warm air in the car and slowly remove the ice in the same direction with a special defrosting shovel.