Turn on the air conditioner and the engine idles intermittently.

This situation is the change of engine load when the air conditioning compressor is turned on and off, which is a normal phenomenon. When the car turns on the air conditioner, it will automatically increase the idle speed to increase the power to offset the resistance of the air conditioner compressor. Now some models can be made more advanced, and the idle speed will not increase, but the engine will automatically increase the fuel injection and keep the idle speed unchanged.

Therefore, if the throttle valve is not maintained for a long time, it is easy to produce carbon deposit, which will hinder the intake of the engine, resulting in insufficient engine power or barely being able to drive the compressor, thus causing idling jitter. The solution is to clean the throttle, which is not expensive, around 300 yuan. If your driving environment is not good, you'd better clean it regularly.

maintain

Change the oil and oil filter regularly. When the oil passes through the pores of the oil filter element, solid particles and viscous substances in the oil will accumulate in the filter. If the filter is blocked and the oil cannot pass through the filter element smoothly, the filter element will burst or the safety valve will open, and the dirt will be brought back to the lubrication part through the bypass valve, which will accelerate the engine wear and aggravate the internal pollution.

Keep the crankcase well ventilated. Contaminants in the air will deposit around the PCV valve, which may block the valve. If the PCV valve is blocked, the polluted gas will flow into the air filter in the opposite direction, and the polluted filter element will reduce the filtering ability. If the inhaled mixed gas is too dirty, it will further pollute the crankcase, resulting in increased fuel consumption, increased engine wear and even damage to the engine.

Refer to the above? Baidu encyclopedia-automobile engine