When the car steps on the accelerator, there is the sound of water spurting out one after another. Check to see if there are any abnormal noises. 1. Learn to distinguish the abnormal noises that are reasonable noises
As for the abnormal noises in cars, it is difficult for ordinary car owners to distinguish which abnormal noises are faulty and which are reasonable abnormal noises. Go to the repair shop to check if something is wrong. 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. Judgment of sounds to describe and compare car sounds. For example, the "squeak" sound made by dry friction of the bearing, the "click" sound made by excessive valve clearance, which is similar to the "click" sound of a small hammer tapping on the cement floor, etc.
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, the parts must be correct and arranged first. Gas sounds, gear meshing noises, 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
Symptom description: When driving and pressing the accelerator or braking, there are always some abnormal noises in 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 unfixed objects in the trunk or rear seats that are easy to roll and make noise, and eliminate the noise caused by some items that are not fixed properly. .
If you find that the friction between the doors and windows causes abnormal noises, you can stick tape on the doors and windows or put rubber on the friction parts. You may be able to reduce or eliminate the abnormal noises, but the result is only a temporary solution and not the root cause. If none of the above problems are found, you must go to a regular repair shop for inspection and troubleshooting.
2. There are abnormal noises in the engine
Symptom explanation: There is a higher possibility of abnormal noises in the engine compartment. Most people also judge that the abnormal noises are in the engine compartment based on the source of the sound. , usually a metallic screeching sound or a whistling noise.
Analysis of the problem: Abnormal noise coming from the engine compartment will include a harsh belt whistling sound, which is generally caused by belt slippage; there will also be a sharp sound of dry friction of metal parts when the engine is running, which is It is usually caused by damage to the bearings of the generator, water pump, and power steering pump; if the sound of air leakage is caused by the engine running, it may be the result of a blockage in the exhaust system, leakage or breakage of the vacuum tube.
Solution: Abnormal engine noise indicates that the technical status of a certain mechanism of the engine has changed. It is mainly caused by excessive wear of some parts or improper assembly and adjustment. Some abnormal noises can predict the possibility of accidental damage to the engine. Therefore, when abnormal noises occur in the engine, they should be repaired in time to prevent the failure from expanding.
It should be reminded that if there is abnormal noise in the engine, the car owner will probably not be able to solve it by himself, and it is best to send it to the factory for maintenance.
3. There is an abnormal noise in the gearbox
Explanation of symptoms: If there is a "rustling" sound inside the gearbox while the car is driving, but it disappears after the clutch or accelerator is depressed, replace it. There will be a whistling sound when shifting.
Analysis of the problem: If the source of the noise encountered during driving is the gearbox, it may be caused by wear of the gearbox bearings or gears, or bearing spots. If the gearbox makes abnormal noises when shifting gears at high speeds, it may be that the gearbox oil contains metal powder, indicating excessive wear of components such as the brake belt clutch in the gearbox.
4. There are abnormal noises in the tires
Symptom description: The tires make rhythmic noises, and the faster the vehicle speed, the higher the frequency.
Analysis problem: When a car tire contacts the ground, it will produce various noises of different strengths and weaknesses depending on the type or unevenness of the road, the speed of the car, the type of tire, and the air pressure of the tire itself. Therefore, no matter how perfect a car is, it cannot completely eliminate the noise generated by the tires and the ground during driving.
5. The engine guard has abnormal noise
Explanation of symptoms: The engine guard has been installed for a while, but after going out for some suburban driving, there was a noise at the guard plate when I came back. Strange noise.
Solution: Screws tend to shift in cars that move frequently. If you often hear a "pop" sound from the air intake grille,If there is an abnormal sound like "pop", in addition to the grille being really loose, the car owner still needs to check whether the engine guard plate screws are loose, or the engine guard plate and the film are loose. In addition to tightening the screws, the abnormal sound caused by the abnormal sound should also be checked. You can easily eliminate the abnormal noise by placing some cardboard items on the abnormal sound parts.
6. There are abnormal noises in the brakes.
Symptom description: The vehicle makes a loud noise when the brakes are applied. Noise, abnormal sound.
Analysis of the problem: Of course, abnormal noise during braking may also be caused by other reasons, such as improper use or deformation of the material of the brake disc, the hardness and pores of the brake friction pad. The efficiency, friction characteristics and compression characteristics are unqualified, the brake pads and brake discs are damp and rusty, the metal wire in the brake pad formula is too hard, and the mechanical brake pad scraper is used to solve this problem. If the problem occurs, just apply the brakes vigorously several times to eliminate the abnormal noise.
6. There is abnormal noise in the brakes.
Symptom description: The vehicle makes a relatively loud noise when braking. , abnormal noise.
Analysis of the problem: Of course, abnormal noise during braking may also be caused by other reasons, such as improper use or deformation of the material of the brake disc, the hardness and porosity of the brake friction pad , the friction characteristics and compression characteristics are unqualified, the brake pads and brake discs get wet and rust, the metal wire in the brake pad formula is too hard, and the mechanical brake pad scraper is used to solve this phenomenon. If so, just apply strong braking several times to eliminate the abnormal noise.
Solution:
The brake pad is one of the most important parts in the braking system. Under the circumstances, the service life of the front brake friction pad is 30,000 km, and the service life of the rear brake friction pad is 120,000 km. If there is a "squeaking" sound when braking, it is mostly an indication of the wear of the brake friction pad. When this happens, car owners should go to the car dealership for maintenance as soon as possible, otherwise the brake pads will be exhausted, causing damage to the brake components and brake failure. Performance malfunctions and accidents occur.