The idle speed of the car is unstable, rising and falling.

Waiting for the speed is a working condition of automobile operation. In many cases, people will spend time here, such as waiting for traffic lights and congestion. But what if the speed of the car is lower than when it is high, which is what everyone calls "unstable idle speed"? Let's look at the reasons for the unstable idle speed of the car.

Because the idle speed of the car is unstable

1, air leakage in intake branch pipe

When the gas that should not enter, the gasoline vapor of the vehicle and the ignited organic waste gas are added to the intake branch pipe, the mixed gas is too rich or too thin, resulting in unstable idle speed of the vehicle.

The way for car buyers to independently identify whether the air intake branch pipe leaks;

Open the hood of the car and remove the air filter of the throttle.

When the vehicle is running, block the throttle with your hand (after blocking, the fire of the vehicle stops, indicating that there is air leakage. If there is a ceasefire, there is air leakage in a certain area).

If you don't put out the fire, there is no need to put out the fire in a hurry. At this time, first check the surrounding pipes to see if there is inhalation. If there is inhalation, it means there is air leakage.

2. Too much carbon deposit on the throttle.

There is too much carbon deposit in the throttle valve and the surrounding air intake system, and the cross section of the gas safety passage changes, which makes it difficult for the control module to accurately control the air intake, and also causes the mixture to be too rich or too thin, which leads to the unstable idle speed of the car.

3. The air inlet is prone to component failure.

There are many components in the intake of automobile engine, such as throttle motor, standby servo motor, pwm duty relay, air flowmeter, intake liquid level sensor, etc., which lead to unstable idle speed of automobile.

4, gasoline and diesel system software failure

The fuel injection pump is blocked, the gasoline filter is blocked, the filter screen of the high-pressure oil pump is blocked, the gasoline and diesel pressure regulating valve fails, and the oil return pipe is blocked. It will lead to incorrect ignition advance angle, too rich or too thin mixture, and unstable idle speed of the car.

5, ignition device failure

Failure of ignition control module, spark plug gap error, burning or damage of automobile spark plug level, excessive resistance of high voltage line and other faults lead to the reduction of ignition flame kinetic energy or fire, which leads to unstable idle speed of automobile.

If the idle speed of the car is unstable, it should be solved as soon as possible. It is necessary to understand that at that time, the automobile engine is no longer in the ideal waiting speed ratio, and the rationality of fuel consumption and the heat resistance of environmental protection will decline.

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