What is the reason for the abnormal noise in the back of the car, and the abnormal noise in the car,

It may be caused by loose screws under the chassis, or it may be due to the exhaust pipe. It is recommended that the owner go to the 4S shop or repair shop for inspection and treatment in time.

If it comes from under the chassis of the car, it may be that there is a problem with the suspension of the car, or that the shock absorber or other auto parts are loose or aging, and the small parts that are loose can be replaced or tightened.

The exhaust pipe and the engine are connected by a soft connection, which may be caused by the damage and aging of the soft connection after the car has been used for a long time. The exhaust pipe and frame connection are held in place by several rubber rings, which can be checked for damage or rubber deterioration. There are seals between the exhaust pipe and the soft connection, the soft connection and the engine, and the seals can be checked for damage.

In addition, the blockage of the three-way catalytic converter will also cause abnormal noise in the exhaust pipe, and it is recommended that the owner regularly clean the three-way catalytic converter. There will also be abnormal sound if there is water stored in the exhaust pipe, so you need to clean the water in the exhaust pipe. (Photo by photo:.)

Wu Jiahong) @2019

I've changed everything I can, what else can I do? If the spring is not compressed and deformed, there will generally be no abnormal sound, but can the spring be deformed when driving?

Loose chassis generally occurs in older cars, when the car is driving in bad road conditions, the steering wheel will feel unstable, the bottom of the car will also come out of the abnormal sound, usually the old driver can feel the overall a little loose, when encountering such a situation, it means that the chassis may be loose, and the reasons for this situation are divided into several, only by understanding the reasons, can we better prevent this problem from happening.

The first reason is the aging of rubber parts, we all know that the elasticity of rubber is particularly good, which can buffer the friction between parts and reduce noise at the same time. However, this kind of thing has a lifespan, and it will age after a long time, and the elasticity is not as good as before, so the buffering capacity will decrease, resulting in abnormal noise in each part, so it is necessary to check these rubber parts regularly and replace them in time.

The second possibility is the reason for the shock absorber, the main role of this part is to inhibit **, when the car is driving in the dustpan section, it will have an impact with the road surface, and the shock absorber can well ensure the smoothness of the car, if the shock absorber is damaged, there will be a scoop phenomenon, so that the chassis is loose, so usually check the shock absorber, if there is a leakage to repair in time.

The third is the clearance of the parts, that is to say, the ball head may be loose, this part is like the joint of the human body, if the ball head is loose, there will be a large gap between the lever and other connected parts, if the gap is too large, when crossing some dustpan roads, the screws between the subframe and the suspension will be loose, then the chassis will become loose, so usually check these two parts.

Thank you for adopting.

Abnormal noises are inevitable. As long as there are almost all cars, 10 tens of thousands of A-class cars, millions of S Mercedes-Benz, after a period of use, there will be abnormal noises.

This is determined by the plastic interior components of the car, many plastic components in the car interior are fixed by elastic pressing, and the plastic material will age and shrink elastically after a few years, so the pressure is not as tight as the new car, and there will naturally be abnormal noise. There are also interior panels of the model, all of which are fixed by plastic buckles, which will age and shrink after a few years, and the driving is in a state of vibration for a long time, especially in bumpy road conditions, and the buckles will always be impacted by external forces, which will accelerate the attenuation of the buckles.

In addition, with the aging of the entire body and chassis, especially the aging of the chassis rubber bushing, the vehicle will be more prone to resonance, and the NVH of the vehicle will become significantly inferior to that of the new car.

In short: the car is a consumable, generally speaking, the life of the car is 7 years, and the quality of the whole car will accelerate after 7 years. At this time, if you want the most quality of life, you have to change cars.

Hello, you said about this situation. It is generally caused by the improper installation of the interior panel of the vehicle. If any piece of abnormal noise. You take that piece off and reinstall it. It should be fine.

Sometimes a mineral water bottle is super loud when it is placed on the car door, and the key is that you can't hear it in the car... Empty the car first, and find the abnormal noise point first. Both of my cars are noisy, but as long as you find out which one is ringing, it will be easy to solve.

The reasons for the abnormal noise behind the car are as follows: 1. The body stiffness is not enough: it causes the vehicle to be deformed during driving, the door and the frame are rubbed or shaken, or some places are dewelded, resulting in friction between the steel plates.

2. Engine problems: engine belt slippage, generator, water pump, power steering pump bearing damage; 3. Gearbox problems: caused by bearing or gear wear and bearing spots; 4. Caused by the failure of the shock absorber or the loosening of the suspension parts.

Extended information: It is normal for the car to have a noise in the back, especially when the trunk of the car is quite empty, and the rear is prone to noise. Some MPV models, SUV models and brigade cars are prone to noise in the back, and the trunk of these cars may resonate and make a sound when there is no thing in the trunk.

The following are the reasons for the abnormal noise behind the car: 1. The body stiffness is not enough: it causes the vehicle to be deformed during driving, and the friction between the door and the frame or shaking, or the dewelding in some places, resulting in friction between the steel plates.

2. Engine belt slippage: generator, water pump, steering power pump bearing damage. 3. Bearing wear:

Caused by wear of transmission bearings or gears, bearing spots. 4. Loose components: caused by the failure of the shock absorber or the loosening of the suspension parts.

2. For example: some MPV models, SUV models and brigade cars are prone to noise behind the trunk of these cars, and the interior panel may resonate and make a sound.