Dongfeng Yufeng generator suddenly cuts off the power and starts again. Check if there is any abnormal noise. 1. Learn to distinguish abnormal noises that are reasonable noises
The problem of abnormal car noises is for ordinary car owners It's hard to tell which noises are faulty and which are legitimate. If you go to a repair shop to check for abnormal noise, only nearly 20% of the cars actually have a problem. There is bound to be a difference between the sound of a model equipped with a turbocharged engine and the sound of a naturally aspirated engine; models equipped with an engine guard may also produce noise due to friction; some car owners may be affected by their own noise after contacting different cars. Lack of understanding of mechanical knowledge, mistaking reasonable abnormal noises for vehicle failure. Therefore, learn to identify abnormal car noises to avoid wasting time and energy.
2. How to identify car noise:
In actual work, due to limitations of working conditions, it is difficult to use special instruments to measure car noise. The sound is similar to the "click-click" sound of a small hammer tapping on the cement floor.
1. Correctly distinguish between normal sounds and abnormal sounds.
When the car is working, the vibrations of various mechanisms will emit sounds of various natures, but the sound does not mean that the car is faulty. In order to avoid unnecessary disassembly, we must first distinguish between normal sounds and abnormal sounds. Normal sound. The engine and exhaust sounds of various system components, gear meshing noise, etc. are all normal sounds. Abnormal noises (abnormal noises) can be divided into slight noises, normal noises and malignant noises according to their impact on car performance. Slight noises, such as the flashing sound of high-voltage electric leakage, the slight loose sound of rolling bearings, etc., are generally small in volume, the degree of wear of the parts is not large, and there is no significant change for a long time. Such faults can still maintain the car without repair. of normal driving.
3. When diagnosing abnormal car noises, attention should be paid to creating good auscultation conditions and trying to eliminate interference from other noises so as not to affect the accuracy of judgment.
It is best to consciously amplify or reduce the sound, that is, use a screwdriver or other metal rod as a stethoscope to contact the sounding part to amplify the sound, or use a single cylinder to cut off the fire to reduce the sound. , to meet diagnostic needs. The auscultation site should be kept quiet to minimize human interference.
3. Below we list some common abnormal car noises that are easy to eliminate and simple identification and elimination methods.
1. There are abnormal noises in the car body
Explanation of symptoms: When driving and stepping on the accelerator or braking, there are always some abnormal noises from certain parts of the car body. The sound is not loud and does not affect normal operation. Driving, but there is always a little worry that something is wrong.
Analysis of the problem: This problem usually occurs because the body stiffness is insufficient, causing the vehicle to deform while driving, the door and the frame rub or shake, or desoldering in some places causes friction between steel plates, etc. .
There are also some cars that have louder wind noise. To a certain extent, this is related to the shape of the car. In some cars, the body parts of some cars are not fixed well and may cause abnormal noise. Generally, tighten the screws. It can be solved.
Solution:
First check whether there are any unfixed objects in the trunk or rear seats that are easy to roll and make noise, and exclude the noise caused by some items not being fixed properly.