Will the cold weather affect the car engine?

It is difficult to start the engine. Generally, when the temperature is between-10℃ and-15℃, it is difficult to start the car cold. When the temperature drops below -40℃, it cannot be started without preheating.

Generally speaking, it is difficult to start a car in winter, and most of the cases are caused by battery loss or expiration of battery service life. When the battery is low, the speed is weak when starting the car, and only a click sound is heard, and then the click sound will gradually become a hiss sound when igniting. Do not ignite continuously to avoid battery exhaustion.

Extended data:

With the decrease of external temperature, the viscosity and density of gasoline become larger, the fluidity becomes worse, the surface tension increases, and atomization is difficult. At the same time, it is difficult for fuel to absorb heat and evaporate at low temperature. Most of the fuel enters the cylinder in liquid state, and the actual mixture is too dilute to start. When the temperature dropped from 0℃ to-10℃, the viscosity of gasoline increased by 76% and the density increased by 6%.

Only 4% ~ 10% gasoline evaporates to form flammable mixture. This makes the fluidity of gasoline worse and the gasification quality worse; The viscosity and density of diesel oil change greatly at low temperature, which affects atomization and makes it difficult to start the engine.

Reference: People's Network-Why is it difficult for my car to start when it is really cold in the morning?