How normal is the car idling?

Normally it is 700-800 rpm. If it is too low, the engine will shake easily. If it is too high, the fuel consumption will be high. As long as it doesn't shake, the design engineer wants to be as low as possible to save fuel.

The idle speed of each car is different, and the idle speed of the same car is different under different conditions. In the case of cold car, the idle speed of the vehicle is about 1300- 1500 rpm, which is because the water temperature needs to be raised quickly to reduce the engine loss. At other times, the idle speed of vehicles is generally below 1000 rpm, and most of them can meet the demand by maintaining 600-900 rpm.

Extended data:

Idle speed grade

1, normal idle speed

When the vehicle is parked and the engine is started, the lowest rotation speed of the engine running stably is called parking idle speed (the process that the engine changes from the idle state of cold car to the idle state that the engine reaches the normal working temperature is called warm car or hot car).

2. Driving at idle speed

When the car is in gear, the minimum opening of the throttle valve remains unchanged, and there is no need to step on the accelerator pedal or loosen it when driving. At this time, the engine speed is consistent with the parking idle speed, which is called driving idle speed.

3. Unstable idle speed

Idle instability is the most common fault in engine maintenance. If the diagnosis idea is incorrect, it will prolong the maintenance time, reduce the work efficiency, and even let the owner transfer to another garage without waiting.