【Owner's home car knowledge】Symptoms of automobile breakdowns have their own characteristics due to different causes. In summary, there are roughly the following situations:
1. Sudden changes in working conditions
The so-called sudden change in working conditions refers to the sudden abnormal phenomenon in the working conditions of the car, which is a relatively common failure symptom. For example: it is difficult to start after the engine is suddenly turned off, or even unable to start; the power of the engine suddenly decreases during driving, and the driving is weak; The symptoms of this failure are obvious, so it is easy to detect.
2. Abnormal noise
The abnormal sound that occurs when the car is running is the "alarm" of car failure. If there is a sudden abnormal sound while driving, the driver should be aware of something wrong with the car, stop and check immediately, and never allow the car to "work while sick".
3. Abnormal exhaust smoke color
During the working process of the engine, the main components of the normal combustion products should be carbon dioxide and a small amount of water vapor. If the engine does not burn properly, the exhaust gas will be mixed with incompletely burned carbon particles, hydrocarbons, carbon monoxide and a large amount of water vapor. In addition, there are nitrogen oxides, etc. At this time, the color of the exhaust gas may turn black, blue or white, which means that the exhaust smoke color is abnormal. For gasoline engines, the normal exhaust should have no obvious smoke. But when the lubricating oil goes up the cylinder, the exhaust gas is blue; when the combustion is incomplete, the exhaust gas is black, and when the oil is mixed with water, the exhaust gas is white.
4. Overheating and high temperature
It usually appears on the engine, transmission, drive axle final reducer, differential and brakes and other assemblies. For example, if the engine is overheated, it is mostly caused by a problem with the cooling system, which is caused by lack of coolant or the pump does not work; if the transmission and drive axle are overheated, it is mostly caused by a lack of lubricating oil; The above phenomena can sometimes be directly reflected by the warning lights on the dashboard, and the driver needs to pay attention to observation when driving, or test the surface temperature by hand.
5. Leakage
Leakage refers to the leakage of fuel oil, lubricating oil, brake fluid, and power steering fluid in the automobile engine. This is also an obvious failure symptom, which can be found by careful observation. For example, when compressed air leaks, the sound of air leakage can be clearly heard.
6. Excessive fuel and lubrication consumption
Excessive consumption of fuel and lubricating oil indicates that the technical condition of the car has deteriorated and malfunctions have occurred.
7. Has a special smell
During the operation of the car, if there are faults such as brake dragging and clutch slipping, it will emit a burnt smell from the friction plate; There will also be a burnt smell when the wire is burned.
8. The appearance of the car is abnormal
The car is parked on a flat field, and the appearance is checked. If there is any horizontal or vertical skew, it is abnormal in appearance. The reason is mostly that the frame, body, suspension, tires, etc. are faulty, which will cause unstable direction, deviation, center of gravity shift, and wheel "tire eating" and other faults during driving.
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