Abnormal noises in automobiles include abnormal noises in the engine, clutch, transmission, main gearbox, suspension system, brakes, steering and body, etc.
1. Common problems with abnormal noises in cars. It is difficult for ordinary car owners to distinguish which abnormal noises are faulty and which are reasonable. If you go to a repair shop to check for an abnormal noise, only about 20% of cars actually have a problem. Models with turbocharged engines are different; models equipped with engine guards may also produce noise due to friction; Some car owners may have misunderstood reasonable abnormal noises after contact with different vehicles due to their lack of understanding of mechanical knowledge. It was a vehicle breakdown. ApSo take care to identify abnormal car noises to avoid wasting time and energy.
2. How to identify car noise:
In actual work, due to the limitations of working conditions, it is difficult to use special instruments to measure the judgment of sounds to describe. and compare car noises. For example, the "squealing" noise caused by the dry friction of the bearing, the "clicking" noise produced by excessive valve clearance, which is similar to the "clicking" sound of a small hammer hitting the ground in cement, etc.
1. Correctly distinguish between normal and abnormal sounds.
When the car is running, the vibrations of various mechanisms will make sounds of different kinds, but the sound does not mean that the car is defective. In order to avoid unnecessary disassembly, you must first distinguish what is normal. abnormal sounds and sounds. The normal vibrations ofe various system components (such as noise on the surface of the engine), gear impact noises when changing gears, intake and exhaust noises using gas as a work source, noises of gear meshing, etc. are all normal sounds.
2. Abnormal noises (abnormal noises) can be divided into light noises, normal noises and malignant noises according to their impact on car performance. Slight noises, such as the flashing sound of high voltage electrical leakage, the slight loose noise of bearings, etc. Generally, the sound mode is low, the degree of wear of machine parts is not large, and there is no significant noise. change for a long time. This type of defect will always persist without repair. Can maintain normal car driving.
3. When diagnosing abnormal car noises, care should be taken to create good conditions.ons of auscultation and try 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 sound part to amplify the sound , or use a single cylinder to cut off the fire to reduce the sound, to meet the diagnostic needs. The monitoring site must remain quiet to minimize interference from human factors.
3. Source of abnormal noise:
Source of abnormal noise 1: Storage compartment. I believe most car owners are not used to organizing storage compartments. Storage compartments that have not been tidied for several years after being purchased by Chedubuzi must be full of messy items. In this case, it doesn't matter where the car is. conduct, as long asue the motor As soon as the objects in the storage compartment are opened, they “beat” with the motor. The abnormal noise you hear is most likely caused by the vibration of objects in the storage compartment.
Second source of abnormal noise: transmission mechanism. Indeed, the car will make a slight noise even if there is no malfunction. There are abnormal noises, but how can we judge whether the abnormal noises coming from the car are faulty or normal? In fact, it is very simple, just note that if the sound becomes louder when the vehicle speed increases, it means that the vehicle's transmission system is faulty. The most effective solution is to check if the car's tires are flat. If this is the case, it is recommended that you visit a regular 4S automotive workshop for repairs.
Third source of abnormal noises: abnormal noises outside the car.If the abnormal noise you hear is coming from outside the car, you should first check whether the car doors and windows are normal, and also check whether there is anything in the trunk. Many times collisions with objects in the car can also occur. which caused auditory hallucinations in the driver. He thought it was because of a car malfunction. Additionally, you should also check if there is any debris around the wiper blades. If there are any, clean them in time to avoid affecting the normal use of the wiper blades.
Source four of abnormal noise: pulley. If you notice that the car is making a "coughing" noise from time to time while driving, it is time to check if there is a problem with the car's pulley. You should know that the lifespan of a car pulley is about eight years. If the car pulley has not been replacedFor more than eight years, it will make a “cough, reed, cough” sound in the cold winter. If you want to replace the pulley, the editor recommends that you go to a classic 4S automobile workshop to replace it. Do not do it yourself, otherwise incorrect operation will damage the car.
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