The yellow warning light of the engine comes on. What is the reason? Can the car still drive?

There are many reasons why the engine fault light comes on. If the engine fault light is only on, the car can continue driving without obvious abnormality, but it needs to go to the 4S shop for inspection as soon as possible.

1. Poor gasoline quality will lead to insufficient combustion of the mixture in the cylinder, resulting in light engine and easy carbon deposition.

2. The existence of carbon deposit at the top of the piston will lead to poor atomization, insufficient combustion and bright engine.

3. When the cold car starts, especially when the weather temperature drops sharply, the engine light will be turned on due to the temperature correction problem of the computer, but as long as the temperature drops to a certain temperature and there is no fluctuation, it will be relatively stable.

4, the engine mileage is too long, the working characteristics of the spark plug will be weakened, leading to the engine bright.

5, the vehicle is too old, mechanical aging leads to poor engine working conditions, poor combustion and ignition, and the engine light is on.

6. The failure of some sensor computer boards caused the engine lights to light up.

Extended data

Matters needing attention in engine maintenance

1, clean the air filter

The air filter is directly related to the air intake of the engine when the car is running. The manager of Guangben dealership told the reporter that the air filter will not be blocked when the car is only driving in the urban area, but if the car is driving on dusty roads, it is necessary to pay special attention to the cleanliness of the air filter.

If the air filter is blocked or there is too much dust, the air inlet of the engine will be blocked, and a large amount of dust will enter the cylinder, which will accelerate the carbon deposition speed of the cylinder, which will hinder the ignition of the engine and cause insufficient power, and the fuel consumption of the vehicle will naturally increase. If you drive on a normal city road, you should check the air filter when the car travels 5000 kilometers. If there is too much dust on the filter element, consider using compressed air to blow out the dust inside the filter element.

2. Remove throttling sludge

There are many reasons for fouling at the throttle, some of which are carbon deposits formed by the exhaust gas from fuel combustion at the throttle; Then, impurities that are not filtered by the air cleaner will remain on the throttle. Too much sludge will cause air resistance and increase fuel consumption.

When cleaning the throttle valve, first remove the intake pipe, expose the throttle valve, remove the negative electrode of the battery, turn off the ignition switch, straighten the throttle plate, spray a small amount of "carburetor cleaner" into the throttle valve, and then carefully scrub it with a polyester rag or a high-spin "non-woven fabric". Deep in the throttle, you can clip a rag and scrub it carefully. After cleaning, the air inlet pipe and battery cathode can be installed and ignited.

3, clean up the nozzle carbon deposit

Because the combustion chamber is easy to produce carbon deposit, it is difficult to start; Carbon deposition in the fuel nozzle will also lead to oil blockage, gasoline injection deformation, poor atomization, and fuel consumption will naturally increase.

For the cleaning of the combustion chamber, a special carbon remover can be used to soften the carbon deposits on the combustion chamber and the fuel nozzle and separate them from the surface of the parts, and then remove the softened carbon deposits. This method of removing carbon has a good effect. Compared with the previous direct wiping, it has the advantage of not damaging the surface of parts, and the efficiency of removing carbon has also been greatly improved.

References:

Baidu encyclopedia-engine