Traditional Culture Encyclopedia - Weather forecast - It's cold, why can't the idle speed come down?
It's cold, why can't the idle speed come down?
After the cold car is ignited, the idle speed will be higher for a period of time. With the increase of water temperature, the idle speed gradually returns to normal, and the normal idle speed is about 800 rpm. This is called cold car high idle speed, which is the normal working process of the vehicle, not a fault. At high idle speed, the engine speed is maintained between 1300- 1500 rpm, and the fluctuation is normal.
The colder the weather, the longer the high idle speed is maintained, and the ignition speed is 1500 rpm. Generally, it begins to drop rapidly after 20-30 seconds, reaching 1200 rpm. After that, the descent is very slow, and it takes at least four or five minutes to reach the normal idle speed. It should be noted that the normal idle speed will not be reached until the water temperature reaches 90 degrees. As long as the water thermometer moves, it will reach normal idle speed above 60 degrees.
Extended data:
Engine idle speed is described as follows:
The instability of vehicle diesel engine at idle speed leads to the fluctuation of diesel engine output torque, which causes torsional vibration of the whole transmission system. This kind of vehicle regards the phenomenon of low frequency vibration before and after (less than 5Hz) as the surge of the vehicle, which not only causes the vibration of the vehicle body, deteriorates the handling performance of the vehicle and reduces the comfort of the vehicle, but also produces loud noise and affects the life of the transmission system.
In addition, it is difficult for diesel engine to run stably in some low-speed areas, which is easy to cause engine speed soaring and external load stall, which has a great impact on vehicle handling performance.
Phoenix. How to heat the car in winter without damaging it? Old drivers teach you the correct way to warm your car.
Baidu encyclopedia-engine idle speed
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