What is the reason why it is difficult to start the engine at low temperature?

1, low-temperature fluidity of engine oil, low temperature in winter, poor low-temperature fluidity of engine oil, large cold start friction of engine, and large oil resistance. At this time, low-temperature starting performance of engine is poor. So try to choose fully synthetic 0w series engine oil in winter.

Because 90% of engine wear occurs during cold start, engine oil with good fluidity at low temperature can reduce engine start resistance and cold start wear. Therefore, choosing oil with good fluidity at low temperature in winter is the protection for your car.

2. Battery, after entering the winter, the charging and discharging ability of the battery will be greatly reduced. When the temperature is too low, the current released by the battery can't reach the power consumption of the starter, and the starter will be weak, which will lead to the decrease of the rotation speed and the failure to drive the piston to run quickly, which will lead to the decrease of the pressure in the cylinder, and the ignition and oil supply can't cooperate well, which will lead to the difficulty of starting.

3. Carbon is deposited in the throttle, nozzle and spark plug of automobile. When the temperature is low in winter, the atomization effect of gasoline is poor. If the nozzle is blocked again, it will lead to poor gasoline atomization and affect the starting performance of the engine.

The carbon deposit on the spark plug is corroded by the soot in the combustion chamber in the cylinder for a long time, and a large amount of carbon deposit will form on the surface of the spark plug, which will hinder the discharge of the spark plug, leading to the failure of ignition and the failure of normal combustion of gasoline to provide power.