How much 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.

Under the following conditions, the idle speed will automatically increase by 50- 150 rpm: 1, cold start, low water temperature; 2. The battery is dead; 3. Turn on the air conditioner for refrigeration.

If the idle speed of the car is unstable, the following dangers will occur:

1. If the idle speed of the car is too high, check whether the intake manifold is loose or leaking, which will greatly increase the fuel consumption and increase the carbon deposition of the engine.

2. If the idle speed of the car is too low, there will be a safety hazard of flameout at any time during driving.

3. When the car is idling at high speed and low speed, it may be that the spark plug or high-voltage bag does not work, which leads to the engine piston not working and produces severe jitter.