What to do if the car is noisy? What causes noisy cars? How to solve it?

Top 4 causes of car noise:

1. Engine noise.

At the top of the list is naturally the abnormal engine noise, which is also the most obvious one in the car noise. Engine squeaks are divided into cold car squeaks and hot car squeaks. The abnormal sound of cold car refers to the abnormal sound from the engine compartment when the car is on, and it disappears automatically after the car is warmed.

This abnormal sound is likely to be because the car is parked for a long time, the lubricating oil basically flows back to the oil pan, the oil pump can not establish the oil pressure in the first time during the cold start, and the oil film is formed between the components, especially the valve inside the cylinder head (upper), which is not lubricated during the cold start, whether it is a hydraulic tappet or a mechanical rocker arm, there will be a certain valve clearance or due to the oil pressure is not enough to time the chain (with intelligent variable valve or valve lift system) fails to work normally to cause a clicking sound.

There are many reasons for the abnormal noise of the hot car, excluding its own factors, then when there is abnormal noise, it is not a problem with the parts or the failure of the components, so if you notice that the engine noise is getting louder and louder, you should go to the maintenance shop in time for maintenance.

2. Tire noise.

Tire noise is present in every car, but the difference in sound magnitude is generally due to the air flow between the tire treads. Because tires are rubber products, they are easy to age and harden after a long time, and the noise can be imagined; The elasticity of the new tires is good, and it has better performance in terms of noise and comfort. If the tire noise is too high, you can check whether the tire is aging and if necessary, you can replace it.

3. Wind noise. Wind noise, like tire noise, is present in every car, but there are several types of wind noise, one is the noise caused by the pressure change caused by the separation of the air flow around the body; The second is air leakage, or suction sound, which is the noise generated by the interaction between the inhalation of the cab and the body gap and the airflow around the body; The third is other noises, including cavity resonance. The faster you travel, the more wind noise will be.

4. Chassis noise.

Generally speaking, chassis noise is caused by a problem with the shock absorber, and the car as a whole will produce a loud noise when passing over uneven roads. At this time, it is necessary to check the shock absorber of the car well, it is very likely that there will be a serious oil leak.

The treatment method of automobile noise is actually to find the noise, and then treat it according to the noise, such as engine noise and chassis noise, which can be reduced by installing soundproof cotton; Tire noise can be replaced with tires with better quiet performance; Wind noise, on the other hand, is not easy to handle.

Lack of coolant. The main function of the coolant is to dissipate heat through circulating flow, taking away the excess heat energy generated in the engine work, if the coolant is insufficient, it will cause the water temperature to be too high and the noise will become louder.

Aging tires. Tires are made of rubber, which will age and harden over time, resulting in noise, especially in poor road conditions, when the noise reaches the cab like thunder. In addition, the grooves of the pattern will gradually be smoothed out and many small cracks will appear, which is also a reason for the louder noise, and it will also affect driving safety.

Too much carbon deposit. Automobile noise, in addition to the mechanical sound emitted by the engine body, also includes the noise of the air intake system, that is, the aerodynamic noise generated during the flow of high-speed gas into the cylinder through the air filter, air intake pipe, and valve. This is especially true when there is carbon deposits in the engine cylinders, so it is best to clean them up regularly.

Aging of the sealing strip. The sealing strip can fill the gap between the body parts, as well as the role of shock absorption, waterproof, dustproof and sound insulation, but it will harden and age after a long time, so that the sound insulation effect will become worse, and even lead to air leakage and water leakage in the car. If the sealing strip is aging, it is easy to produce noise and abnormal noise, if the problem is serious, you can choose to replace it directly.

What is the noise of the car? Targeted to find out the different noises on the car**, in order to prescribe the right medicine and treat the "noise". According to experts, there are four "sources" of car noise:

Engine noise, tire noise, noise in the air, and noise caused by body structure. 1.Engine noise.

In addition to the mechanical sound emitted by the engine block, it also includes the air intake system noise, that is, the high-speed gas enters the cylinder through the air filter, intake pipe, and valve, and during the flow process, a strong aerodynamic noise is generated. Engine noise is mainly transmitted into the cockpit from the fire barrier and the front floor of the cab. 2.

Tire noise. The general tire noise is mainly composed of three parts: one is the air flow between the tire pattern and the air disturbance around the tire; the second is the tire vibration noise caused by the vibration of the carcass and the tread part; The third is the road noise caused by uneven road surface.

3.Airborne noise. One is wind noise, which is the noise caused by the pressure change caused by the separation of the air flow around the body; The second is air leakage, or suction sound, which is the noise generated by the interaction between the inhalation of the cab and the body gap and the airflow around the body; The third is other noises, including cavity resonance.

4.Structure-borne noise. It is mainly affected by two factors, one is the vibration transmission mode of the body structure, and the other is the noise generated by the metal components on the body due to the vibration generated by the inside and outside.

Car sound insulation is generally suitable for cars with lower configurations, more average comfort or lower ends. If it is a high-end car, the original sound insulation is already quite good, and it is redundant to spend money on sound insulation. Noise Reduction Surgery The owner feels that the engine is too loud when driving at high speeds, and the sound outside the car can be heard clearly, and the sound from the tires is particularly obvious when the speed is above 80km/h.

According to the owner's feedback, after the master conducted a road test and a full car inspection, he found that the noise of this car was mainly in four aspects. The first is the noise of the engine itself. Due to the cost of the car company's vehicle design, some parts will not use the best materials, such as the car hood does not use sound-absorbing materials, and the firewall does not paste anti-sound materials, resulting in the sound of the engine being transmitted to the car through the lower dashboard and chassis.

Secondly, the door noise conduction and body sealing are insufficient. The four doors of the car are the closest structure to the interior, and the doors are composed of sheet metal parts and door trims. The master specifically pointed out that most of the new cars on the market with a price of less than 300,000 yuan have no sound insulation treatment, so you can feel the obvious metal sound when the door is closed.

Third, the tires produce noise, and the fenders and chassis conduct noise. The noise generated by the tires is directly related to the material of the tires in the first place, but the main reason is the body of the car, when the tires make noise, the sound will be transmitted to the car through the fenders and chassis. Fourth, the conduction of metal parts is an important way for the noise transmission of this car.

Generally speaking, some parts of low-end cars and high-end cars are directly formed by metal, and there are no sound reduction measures. Special care must be taken when soundproofing the construction.

Hello, car noise can be solved from several aspects. First in. Door.

The inside of the hood and fender can be equipped with shock-absorbing plate soundproof cotton. to solve the problem of wind noise can be replaced. Kaizhi softer tires to solve the problem of tire noise, and change the oil with a higher viscosity coefficient to reduce engine noise.

I hope mine can help you.

The best solution for automobile sound insulation materials to solve automobile noise: 1: sound insulation and shock absorption glue:

Metal and plastic sheets are used in the manufacture of every car, which resonates during driving and causes a lot of low-frequency noise. The original car factory will also deal with some vibration sound sources, but it is far from enough, so whether it is a high-end car or a low-end car, there are no installation and shock absorption materials. Two:

Sound-dampening and heat-insulating cotton: steam.

If it is not the engine noise caused by the malfunction, it is advisable to replace the sealant strip on the hood, which will minimize the noise. There is also a moss tire noise, it is recommended to check the tire pressure regularly, and the current car inflator pump is having a tire pressure monitoring function, which is still very convenient.

If the car is very noisy, you can use a sound insulator or you can use soundproof glass, both are fine. Noise prevention equipment can be used as much as possible.

Almost every car that has been driven for a long time will increase the engine noise and vibration. This phenomenon is easy to explain, the engine will age, and with the aging will definitely bring problems of one kind or another.

1. Most of the vibrations are pots with machine foot glue.

Although it is true that the engine body will wear out a little with the increase of years of use, and the accuracy of various fits inside the engine will be reduced, this is far from the level that will cause significant vibration. The engine vibration is intensified, and in most cases it is a problem with the foot glue.

The so-called foot glue is called engine shock absorber seat. In fact, it is a few rubber blocks that are padded between the engine and the metal frame. Because the engine is running at high temperature for a long time, and rubber itself is very sensitive to high temperature, so the aging of the foot rubber is inevitable.

The solution is very simple, just replace the foot glue. But this operation requires lifting the engine.

2. There is basically no solution to the abnormal noise in the interior.

In addition to the sound of the engine, the most common thing in old cars is all kinds of strange interior noises. Some of the abnormal noises can't be distinguished at all. In most of these cases, it is a problem of abnormal noise in the interior.

Why does the interior make abnormal noise? The interior of a car is made up of many parts, including seats, panels, equipment, and miscellaneous things. These things are basically all screwed or glued in place.

The glue hardens over time, and after hardening, friction between the parts makes a sound. The place where the screws are fixed will be loose for a long time, and there will be abnormal noises if they are loose.

3. Increased wind noise? Check the door seals!

The increased wind noise is most likely to be the fault of the door seals. Quite simply, one of the main functions of door seals is to seal the vehicle and prevent excessive wind noise from entering the cabin. The door seal is also made of rubber, which will harden after a long time, and of course it will not be able to stop the air leakage after hardening.

This is relatively easy to solve, distinguish which side of the door is the most noisy, and replace all the door sealants on that side. It also directly replaced all the sealant strips on all doors of the whole car.

However, there is a certain chance that the wind noise is still so loud after the change, then it is very likely that the sound insulation glue has hardened in places such as wheel arches, engine compartment firewalls or trunks.

1. Sound-absorbing foam reduces engine noise.

The noise in the car comes from the engine to a large extent, and the noise of the engine increases with the increase of speed, in the sound control of the engine, in addition to artificial, the installation of soundproof cotton can also play a certain role. A high-grade sound-absorbing foam acoustic material is pasted under the hood, which can not only absorb and consume a large amount of engine noise, but also suppress the vibration of the hood, block the heat from the engine, and protect the paint from high temperatures.

2. Comprehensive sound insulation and tire noise reduction.

Road noise and tire noise are also a major source of noise, as well as a major annoyance for the occupants of the vehicle. Experts say that the use of shock absorbers, sound-absorbing pads and door seals to fully insulate the fenders, floors and doors can effectively improve tire noise and road noise. Some noises are caused by faults in the vehicle itself, such as abnormal tire pressure, irregular wear, suspension or chassis damage, and abnormal engine noise.

Therefore, before doing car sound insulation, you should check the condition of the car first.

3. Strengthen sealing resistance and wind noise.

Wind noise is caused by the wind pressure exceeding the door sealing resistance when the car is driving at high speeds. The higher the speed, the greater the wind noise. Strengthening sealing resistance is the most direct and fundamental solution, and door seals and inner seals can solve this problem well.

4. Sound insulation engineering reduces system noise.

The sound insulation project of the system is mainly completed through three steps: vibration reduction, noise reduction and sealing. Among them, the doors, trunk, chassis, hood and roof are the most prone to air friction noise, so these places are the focus of sound insulation and noise reduction. It is understood that through professional construction technology, without destroying the original car circuit and changing the original car structure, the sound insulation project can reduce the noise in the car by 4-8 decibels, greatly improving the comfort of driving.

What to do if the car is too noisy, the old driver teaches you four tricks to solve!

There are many reasons for the noise of the car, and if the oil is not changed in time, it will lead to the increase of the noise of the car engine, and the damage of the spark plug can also lead to the increase of noise.

If it bothers you, cover your ears.

If the acceleration is weak, clean the throttle oil circuit.

What is loud noise? Different noise workarounds are different.

Noise reduction method 1: paste the damping plate

Function: Reduce the sound generated by vibration.

There are many ways to transmit sound, but the greater the vibration amplitude and frequency, the louder the sound tends to be, so you can install a professional shock absorber plate in a place where the sound is louder or easier to produce sound to eliminate some abnormal noises.

Noise reduction method 2: Install door seals

Purpose: Deal with external wind noise.

The sealing strip can fill the gaps, closely combine the door, rear box lid and car body, enhance the air tightness of the car, and effectively reduce the air noise into the car, and the noise in the car is naturally less. The sealing strip also has the effect of blocking dust and heat.

Noise reduction method 3: Paste sound-absorbing cotton

Function: Mainly used to deal with trunk noise and door noise.

To deal with the engine is to install sound-absorbing foam, and in the trunk you can try to install sound-absorbing cotton. The bottom of the tail box and the wheel arches on both sides of the tail box are equipped with sound-absorbing cotton materials, which can effectively reduce the tire noise, road noise and the noise caused by the three-way surface of the tail row. Generally, sponge foam is used, which easily absorbs inside the door'Rainwater, these moisture will not volatilize completely for a long time, and mold and other conditions will occur, which will affect the sound insulation effect.

There is a kind of Windsor sound-absorbing cotton, the biggest difference between the material and the traditional sound-absorbing cotton is that it has good hydrophobic and antibacterial properties, and can quickly drain the stagnant water, and the volume of this material is also small, if the owner wants to continue to strengthen, the Windsor sound-absorbing cotton can be used on the door or ceiling.

Noise reduction method 4: tire change

Function: Reduce tire noise.

The tires have been used for a long time, the friction increases, and sometimes there will be a lot of noise, so simply be direct and change to a new tire, which can solve this problem very well.

Noise reduction method 5: install sound-absorbing foam

Purpose: Mainly used to deal with engine noise.

The engine is too loud, and a high-grade sound-absorbing foam material can be pasted under the engine cover, which can both absorb and consume a large amount of engine noise, and also suppress the vibration of the hood. This way to use professional construction technology, without destroying the original car circuit and not changing the original car structure under the premise of completion, for safety, the owner of the car best do not stick their own.

If there is noise, the owners should check and maintain it in time to avoid problems with car parts and potential safety hazards.