When driving, I found that the car chassis made abnormal noise, how to check the cause of the abnorm

When driving, you find that the chassis of the car is abnormal, and the inspection method is as follows:

1. In the process of driving, the cause of abnormal noise, most of which are caused by the lubrication of auto parts is not in place, if the lubrication of parts is not in place, it will also lead to the reducer gear grinding scars, if the abnormal sound can be heard during normal driving, it means that the nut of the main gear of the reducer is loosened and caused by the abnormal sound.

2. When the car is moving, the noise of the rear wheel bearing can rarely be heard under normal circumstances, and when the car is sliding or neutral, unless the rear wheel axle is seriously damaged, it will produce abnormal noise.

3. Distinguish between tire noise and rear axle noise, tire noise changes with the road surface, but the rear wheel noise is not. The noise of the tires is the same when the car is driving and coasting, but the noise of the rear wheels is different.

4. The sound of the front bearing of the reducer is louder when the car is sliding, and the abnormal sound of the reducer bearing changes with the change of vehicle speed. The rear bearings are noisy when driving.

There are many reasons for the abnormal noise of the car chassis:

1. Check whether the transmission shaft and universal joint are deformed or leaking. If there is deformation of the transmission shaft and universal joint, it needs to be replaced in time, if it is only a lack of oil, it needs to be relubricated, and the oil seal should be replaced if necessary;

2. When the chassis bolts and screws are loose, the bolts and nuts should be tightened or replaced in time, if you need to drive often on bumpy roads, then you can check the chassis fasteners regularly;

3. Check whether the brake disc bracket is loose, and check whether the brake pads are abnormally worn.

If the roommate is leaking, we need to judge the leakage. If the leak sound comes from the tire and the car instrument shows that the tire pressure is abnormal, we only need to replace the spare tire. If the air leakage sound comes from the exhaust pipe or exhaust drum, the problem can be solved by replacing it with a new seal.

It is actually normal for the shock to have a sound similar to gas compression when passing over speed bumps, and this does not need to be repaired.

Hello! Glad for your question.

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.

You can go to the 4S shop to check and let the professional maintenance master check, which will be faster and will save a lot of detours.

In such a situation, we must check the engine system in time, and then we should also observe whether the engine has a failure and the specific cause of the failure, so as to find out the problem.

It is very useful to find the cause according to where the car responds, so that it can be found.

1. Constant velocity universal joint abnormal sound: Constant velocity universal joint is commonly known as ball cage, and its main function is to transmit power and complete steering. If the constant velocity universal joint is seriously worn, and the vehicle turns while driving, there is an abnormal sound similar to "rattle and rattle", you only need to confirm which side the abnormal noise is, and then replace the constant velocity universal joint to solve it.

2. Abnormal sound of wheel bearing: The function of wheel bearing is to connect the vehicle and the tire. No matter how big the tire is, the connection between the vehicle and the tire is by a small wheel bearing, if the wheel bearing is damaged, it will cause the tire to deviate, or even the tire to fall off.

When the vehicle is driving, it emits a continuous abnormal sound similar to "buzzing", which is the alarm of the wheel bearing, and the faster the speed, the stronger the sound, if it is slightly damaged, there will be an abnormal sound when the direction is generally tapped.

3. Abnormal sound of exhaust pipe: abnormal sound of exhaust pipe is generally caused by rupture or leakage of exhaust pipe, and there will be "poof" noise after the vehicle starts. It may also be caused by the damage or blockage of the three-way catalytic converter, which is used to reduce the noise while purifying the exhaust gas.

The above is the introduction of the abnormal sound of the car chassis, I hope it will help you.

1. Interference between parts.

Possible cause: The two parts affect each other due to impact or the installation of other equipment.

2. Loose bolts or nuts.

Possible reasons: a. Driving on the road with poor road conditions for a long time, the bolts are naturally loosened;

b. Improper disassembly and installation of bolts damage;

c. The tightening torque is not enough or the bolt specification is wrong.

Solution: Tighten or replace the bolts and nuts.

3. The universal joint of the transmission shaft is faulty.

Possible causes: Dust cover cracked or oil leakage caused by failure to repair in time.

Solution: Replace the new transmission shaft universal joint.

4. Abnormal noise caused by damage to each ball joint, suspension and connecting bracket.

Possible causes: After long-term use, the ball joint is loose or the rubber liner is aging and cracking.

Solution: Replace the ball head or support pad with a new one.

5. Abnormal noise of braking system.

Possible causes: a. Loose brake pads, brake calipers or brackets;

b. Brake pad or brake disc failure;

Solution: Check whether the braking system is loose and whether the brake pads and brake discs are abnormally worn.

When checking the abnormal noise of the automobile chassis, you should first distinguish whether it is the sound of the engine or the sound of the automobile chassis. Only when the engine is running, under normal circumstances, the engine has an abnormal sound; When the car is moving, there is still a sound when the engine is turned off, neutral or when the clutch pedal is stepped on. It may be that there is a noise from the chassis of the car.

1. There is a sound caused by resonance. Most of the noise is caused by the engine guard and chassis resonance. Most of the resonances in the chassis are easy to observe, and the resonance is not always there, and most of them will only have a sound in a certain speed range of the engine.

2. There is a problem with the rubber sleeve of the balance bar. The phenomenon is that when the car passes over uneven roads, the chassis will make a noise.

The balance bar is also called the anti-roll bar and the stabilizer bar, and there are two buckles on the balance bar, and the buckle is the rubber sleeve of the balance bar. It is cold in winter and hot in summer, and with the erosion of soil and dust, it will become harder and harder after aging. When the car passes over uneven roads, the height of the upper and lower wheels is inconsistent, which will cause a creaking sound.

3. There is a sound due to loose bolts, such as loose bolts at swing arms, connecting rods, shock absorbers, etc. The reason is simple, it should be a fastener but it is not tightened, and it will naturally shake and cause a sound.

The abnormal sound of the chassis of the car may be the abnormal sound of the suspension of the car. The suspension system of the car generally includes the upper and lower swing arms, balance bars, ball head shock absorption, etc., and the abnormal sound caused by the suspension system is generally a dull or crisp impact sound. For example, after the balance rod is damaged or the bushing is worn, there will be a continuous abnormal sound of "Gregrad" when passing through bumpy roads, and there will be a dull sound of "knock knock" when the shock absorption is damaged through pits or bumpy road sections.

If the vehicle has this kind of abnormal noise, it is best to repair it as soon as possible, as damage to the suspension system will lead to deviation from the direction and tires.

It is also possible that constant velocity joints are commonly known as cages, which are divided into inner cages and outer cages. If the vehicle turns in the middle of the driving and there is an abnormal sound similar to "rattle rattle", it is usually caused by serious wear and tear of the constant velocity universal joint, and you only need to confirm which side the abnormal noise is, and then replace the constant velocity universal joint can be solved.

Abnormal noise of automobile bearings. No matter how big the tires of the car, the connection between the body and the tires is by a small wheel core bearing, the core bearing is damaged, the vehicle will make a continuous abnormal sound similar to "buzzing", the faster the speed, the stronger the sound, if the bearing is slightly damaged, there will generally be abnormal sound when the direction is lightly hit. Severe bearing damage will cause the tire to deviate, and serious tire eating will cause the tire to fall off.

The above is the more common abnormal noise of the automobile chassis, if the vehicle has the above abnormal noise, it must be repaired and replaced as soon as possible. After all, there are many reasons for the abnormal noise of a car, so you have to go to the repair shop for detailed maintenance.

If you hear the abnormal sound of "Zizi" in the process of driving, and this is the abnormal sound caused by the problem of the engine belt, because the abnormal sound of "Zizi" is mostly the aging of each belt group of the engine, or the belt is too loose caused by the problem of the tensioner, the friction abnormal sound, belt slippage, etc., if there is a similar "Zizi" abnormal sound, then look for the major belt groups and tensioners inside the engine, such as engine timing belt, generator belt, circulating water pump belt, air conditioning belt, power pump belt, etc. The problem that causes this abnormal noise is the abnormal sound of the engine belt, which is caused by the smooth grinding surface of the joint surface of the belt and the pulley. It usually occurs when the engine speed changes rapidly, and sometimes the belt rings when the load of the attachment driven by the belt increases.

How to solve the problem of abnormal noise of engine belt.

1. Check whether the accessories driven by the belt are damaged, stuck, loose or the power of the accessories has increased.

2. Replace the belt, or use 100 gauze to polish the joint surface of the pulley and the belt (light grinding is fine).

3. The temporary solution can be to drop 1 2 drops of oil on the joint surface of the belt and the pulley (it will not affect the belt slippage).

If it is the generator belt that rings and the headlights are more obvious, you have to take off the generator belt, turn the motor pulley to see if the generator rotates smoothly, if the generator is normal, you can check whether the battery is not stored power, because the battery storage is not good will increase the load of the generator.

I believe that many friends have encountered the problem of abnormal noise of the vehicle chassis, especially when passing through bumpy road sections, so let's analyze what are the causes of abnormal noise of the automobile chassis? There are many reasons for the abnormal noise of the automobile chassis, we can try a way to check the vehicle first to see whether the chassis parts are connected to the mirror, for example, Russia is loose, tighten in time or the nut is loose, and replace it in time, which requires us to check regularly, rather than after the chassis abnormal noise, we can also check whether the brake caliper and brake bracket are loose.

You can take a look at whether the brake pads are badly worn. Abnormal noise on the chassis of the car refers to the abnormal sound emitted by the parts or mechanisms of the steering system and braking system during the driving process of the car. Most of the reasons for the noise are due to the wear or damage of the car parts, the connection is loose, resulting in the use of the car, the key to the clutch abnormality, if a part of the clutch fails, there will be abnormal noise, try to change the position of the clutch pedal, there will be a sound, you can conclude that the clutch is abnormal.

There are different situations in the separation of bearings in foreign lands, it may be that the bearing is stuck, the continuous brushing friction sound, and the indirect sound caused by the lack of oil pine ore, if the clutch squeaks and squeaks, the engine should be turned off immediately, the rider has an abnormal sound, and it may be the cause of the transmission, from the transmission itself, its structure is more complex, there are multiple gears, so all links may occur abnormal noise. If there is an abnormal noise in the engine, this is a more serious problem, which needs to be investigated by a professional technician, let's talk about the transmission, if the temperature of the transmission rises, the abnormal noise business increases significantly, and the main reason is that the tooth backlash increases because of the loss.

After the ball bearing makes an abnormal sound in the work due to bad reasons, the engine starts, and a box of abnormal noises is heard when each gear is hung in a box of driving, which may be due to the influence of the ball bearing.