What s wrong with the car squeaking when it starts

On the issue of abnormal noise of automobiles, it is difficult for ordinary car owners to distinguish which ones are abnormal noises and which ones are reasonable abnormal noises. Only nearly 20% of the vehicles that went to the repair shop to detect abnormal noises really had problems. In the case of a turbocharged engine, there is a must be a difference between the sound and the sound of a naturally aspirated engine; Models with engine guards may also make noises due to friction; After some car owners come into contact with different cars, it is likely that they lack their own understanding of mechanical knowledge, so they can distinguish the abnormal noise of the car and avoid wasting time and energy.

Second, the identification method of car noise:

In practice, due to the limitations of working conditions, it is difficult to measure the sound of the car with special instruments, and the sound of the car can only be described and compared with the judgment of the sound in daily life. For example, the "rattle" sound caused by the dry friction of the bearing, and the "click" sound similar to the small hammer hitting the cement floor caused by the excessive valve clearance.

1. Correctly distinguish between normal and abnormal sounds.

The vibration of each mechanism in the work of the car will emit a variety of sounds, but the sound does not mean that the car is faulty, in order to avoid unnecessary disassembly, we must first distinguish between normal sound and abnormal noise. The normal vibration sound of each system component (such as the noise on the surface of the engine), the impact sound of the gear when shifting, the air intake sound and exhaust sound of using gas as the working source, and the gear meshing noise are all normal sounds. Abnormal noise (abnormal noise) can be divided into slight noise, general noise and malignant noise according to the impact on the performance of the car.

Slight noise, such as the flashover sound of high-voltage electric leakage, the slight loose sound of rolling bearings, etc., the general volume is small, the degree of wear of the parts is not large, and there is no significant change for a long time, and this kind of fault can still maintain the normal operation of the car without repair.

3. When diagnosing abnormal noise, attention should be paid to creating good auscultation conditions and trying to eliminate the interference of 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 screw or other metal rod as a stestological instrument to contact the sound part to amplify the sound, or use a single cylinder fire cut-off to reduce the sound to meet the diagnostic needs. The auscultation site should be kept quiet to minimize human interference.

If the car squeaks when driving slowly, it is likely to come from the suspension, the suspension of the car includes connecting rods, springs, shock absorbers and balance bars, and one of the components is abnormal, such as loose bolts, which may cause abnormal noise due to shaking.

If it is issued from inside the car, it is necessary to check whether the airbag hairspring under the lower steering wheel and the cross universal joint inside the direction column are normal. If these two components are worn or fail, there will be a failure phenomenon as you said. If there is an abnormal noise in the external version of the vehicle, it is necessary to check whether the plane bearings above the lower two front shocks are worn.

Whether the ball head of the steering machine is loose. The rack and pinion inside the steering machine are worn. The failure of these 3 components will lead to the failure of the vehicle as you described.

If you press the brakes lightly and find that the abnormal noise increases, then it is certain that there is a problem with the braking system, such as the brake pads are too thin, the brake disc and brake pads are worn unevenly, the brake cylinder, the master cylinder, the caliper is faulty, etc., which will lead to the abnormal sound of the braking system, which is mainly manifested as a sharp and continuous sound. If the engine belt is loose, then there will also be a squeak, then we can try to clamp the transmission belt with our fingers, and then twist it, pay attention to the operation should be carried out when the engine is cool, the twist angle should generally be below 90 degrees, otherwise the tightness must be adjusted. Aging of components, this situation may occur where there are rubber parts, here to pay attention to one place, it is the engine mount gasket, if it ages and hardens or cracks, it will cause the car to vibrate more, the steering wheel trembles, and the noise becomes louder.

Photo by Lu Liting of Pacific Automobile Network).

There are many reasons why the vehicle makes an abnormal noise.

1. It is the abnormal sound of doors and windows.

2. Abnormal engine noise.

3. It is not the cause of abnormal noise.

So there are many kinds, and it is recommended that you go to your local 4S store to check them out. Only then can the problem be solved.

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.

Dear, this question is up to me, it takes a little time to type, please be patient, thank you!

Hello, dear, the exclusive technician of the car master will serve you, attentively, carefully and attentively answer your car questions, find solutions and solutions to the corresponding problems for you, and will definitely provide you with satisfactory service! Hope mine can help you! Dear, hello, the vehicle has a sizzling sound when driving, the reasons are as follows: the first vehicle brake pads are too thin, resulting in this phenomenon needs to check the brake pads in time, if the thickness of the brake pads is less than one centimeter, it needs to be replaced in time Second, the phenomenon caused by the problem of the vehicle wheel bearing needs to check the wheel bearing.

Hello, if there is an abnormal noise in the process of driving the vehicle, then most of the parts of the chassis are aging and loose, and you have to go to the repair shop to check to see which parts are the problem, and then replace it.

The wiper is a bit loud, if it's too big or like chopping vegetables, it's time to change the wipers! As for the central control, I didn't think there was any abnormal noise.

Hello, the current number of people consulted may not reply in a timely manner, if it is a vehicle failure problem, it is recommended to use the computer to detect the specific cause of the failure, search for "car master" can consult car problems at any time, 24 hours ** answer.

If the car squeaks at low speeds, it's most likely from the suspension. The suspension of a car includes connecting rods, springs, shock absorbers, and balance bars. If one of the parts is abnormal, such as a loose bolt, it may produce abnormal noise due to shaking.

If it is in the car, you need to check whether the airbag hairspring under the steering wheel and the cross universal joint in the steering column are normal. If these two parts are worn or have a degree of failure, there will be what you call failure. If it is an abnormal noise in the exterior version, you need to check whether the plane bearings on the lower two front shock absorbers are worn.

Whether the ball joint of the machine is loose or not. The inner rack of the steering gear is worn. The failure of these three components will lead to the failure phenomenon you mentioned.

If you apply the brakes lightly and find that the abnormal noise increases, then you can determine that there is a problem with the braking system, such as thin brake pads, uneven wear of brake discs and brake pads, faulty brake cylinders, master cylinders and calipers, etc. , which causes abnormal noises in the braking system, mainly in the form of sharp and persistent noises. If the engine belt is loose, it will squeak.

At this point, we can try to grip the belt with our fingers and twist it. Note that the operation should be carried out when the engine is cooled, and the torsion angle should generally be below 90 degrees, otherwise the tightness should be adjusted. Parts are aging, which can happen where there are rubber parts.

One thing to note here is the engine mount rubber pads. If it ages, hardens, or breaks, it can cause the car's vibration to increase, the steering wheel to tremble, and the noise to increase.

If the car squeaks while driving slowly, it is most likely from the suspension. Automotive suspension includes connecting rods, springs, shock absorbers, and stabilizer bars. If there is an abnormality in one of the parts, such as a loose bolt, it may make an abnormal noise due to shaking.

If you lightly step on the brakes, you can find that the abnormal noise increases, and you can determine that there is a problem with the brake system, such as the brake pads are too thin, the brake disc and brake pads are worn unevenly, and the brake cylinder, master cylinder, and brake caliper are missing, which will lead to abnormal noise in the brake system, mainly sharp and continuous sound. If the engine belt is loose, it will squeak. At this point, we can try to grip the belt with our fingers and twist it.

Note that the operation should be done after the engine has cooled down. The angle of torsion rubber should generally be less than 90 degrees, otherwise the beam should be adjusted tightly. If there are rubber parts, the parts may age.

One thing to note here is that if the engine support rubber pads are aged, stiffened or broken, it will cause the vehicle to vibrate, the steering wheel to shake, and the noise to be excessive.