What is the sudden screeching of the car, the screeching of the car when it starts?

If you hear a "sizzle" noise while driving, and this is the engine belt.

The abnormal sound caused by the problem, because the "zizi" abnormal sound is mostly the aging of the 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 the engine timing belt.

Generator belts, circulating water pump belts, air conditioning belts, booster pump belts, etc., and 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.

1. Fault phenomenon:

The wheels make a screeching sound of metal rubbing as they travel.

Second, the cause of the failure:

1. It may be that the brake disc has hard spots.

2. The brake separation pump is broken, and the caliper cannot be separated from the brake disc.

3. Excessive wear of brake pads causes grinding iron.

3. Solution:

1. If you step on the brake, you can grind it off, just use it, and the brake pads contain a lot of metal.

2. Replace the brake cylinder to restore the brake to normal.

3. Replacing the brake pads can be solved, and the brake disc should be replaced if the wear is serious.

Open the nose cover and observe, if there is a sound of metal wear, it is suspected that the bearing of the rotating part is aging and damaged. If the sound disappears after the car is warmed, it may be that your oil is aging and the parts are oil-free after parking. If there is a sound all the time after starting, and the driving is weak, it is suspected that the piston ring is broken.

If the sound is between the external motor and the fan, it is suspected that the engine drive belt is damaged.

In short, in this case, you should stop the car as soon as possible and tow it to the car dealer for inspection and repair, otherwise, it may lead to a greater failure.

Reasons: 1. It may be the carbon brush inside the starting motor.

There was a malfunction;

2. The engine belt has been in place for a long time.

It will age and slip, and then make a squeaky sound;

3. The engine support is not installed properly due to loose bolts of the frame.

Solution: If the bolts of the base are loose, you can find the specific screws and tighten them by yourself, if the belt is loose, or if the belt is aging, you can replace it with a new belt. If the carbon brush inside the motor fails, you must go to 4S to find a professional to deal with it, and you can't disassemble the engine by yourself.

Extended Information: All timing belts are fitted.

The engine, manufacturers will have strict requirements, in the specified cycle to regularly replace the timing belt and accessories, the replacement cycle is different with the structure of the engine, generally in the vehicle to 610,000 kilometers should be replaced.

Common faults in the electrical system:

1. The battery discharges itself.

The battery is fully charged and unused, and the power gradually decreases. It is mainly the impure electrode material and electrolyte of the battery.

Impure, the storage temperature is too high, or the battery is not used for a long time, the sulfuric acid sinks, and the potential difference between the upper and lower parts of the plate occurs.

and other reasons.

2. The battery electrolyte is consumed too quickly.

It may be related to leakage and leakage caused by cracking of the shell and sealing glue, excessive charging current, and bumps in the driving road.

3. The charging system is not charged.

It is manifested as a charging indicator that does not go out when the engine is running at medium high speed. The main causes are slipping or breaking of the generator drive belt, open or short circuit lines, damaged regulators, or generators that cannot generate electricity.

4. The charging current is too small.

In addition to poor line contact, transmission belt slippage, but also with brushes.

The squeak of the car when it starts is caused by a loose belt or a lack of lubricating oil in the engine bearings.

There is a screeching sound when the engine starts, and that's the problem!

Under normal circumstances, the car will not make harsh noise when the air conditioner is turned on, and the noise indicates that there are the following problems: there is a noise made by the belt slipping, especially when accelerating, the noise is greater; The other is the noise of the magnetic plate of the air conditioner compressor due to the weakening of the magnet suction of the magnetic plate rubbing against each other, but it is different from the noise of the belt, and the noise of the magnetic plate is the sound of iron and iron rubbing.

1. The air conditioning belt pulley and the transmission belt deviate, and a sharp friction sound will be transmitted in the whole process of deviation, check whether there are oil stains on the transmission belt, and if it is oil stains, the transmission belt will be cleaned up and tidy. If not, it is necessary to adjust the anchor bolts of the refrigeration compressor to make the transmission belt of the refrigeration compressor tighter, so that the sliding friction can be expanded.

2. If the transmission belt is loose and there is a sound, you can clamp the tension tightness of the transmission belt by hand, which is very loose and tight, if it is due to the use of the transmission belt for a long time, it must be replaced.

3. If the tensioner of the transmission belt is destroyed, there will be a sound, and the new tensioner must be replaced.

4. The sound caused by the clutch slippage of the refrigeration compressor, or the sound caused by the rolling bearing of the refrigeration compressor, must be removed to check what is going on.

5. The blower motor and ventilation duct will also cause noise when dirty things enter, and the blower motor and ventilation duct must be cleaned.

Distinguishing common faults is generally a problem for blower motors to make noise inside the car, and the sound outside the car is caused by common faults such as belt pulleys or refrigeration compressors. If you don't understand the disassembly process, if the internal components of the air conditioner are destroyed, it is best to go to the car 4S shop for maintenance, and if you accidentally destroy other components, it will increase the damage.

If the air conditioner pulley slips with the belt, it will make a sharp friction sound during the slipping process, check whether there is oil stain on the belt, and if it is oil stain, the belt will slip and clean. If not, you need to adjust the position bolts of the compressor to make the belt of the compressor tighter, which can increase the friction.

The head bearing is aging, replacing the bearing can solve the problem, and it is possible that the belt is loose and causes abnormal noise.

What is the reason for the abnormal noise of the car air conditioner?

The compressor of the car air conditioner is damaged, due to lack of lubrication, wear of the rotating shaft, failure to compress air normally, or air leakage. When there is a problem with the air conditioning compressor, the air conditioning system in the car will have symptoms of abnormal noise or no cooling.

The air outlet of the air conditioner is blocked.

Fan blades are worn.

The car makes a screeching sound when the air conditioner is turned on, also because it will combine with the wind when the air conditioner is turning, and if the wind is too strong, there will be some noise.

If there is an abnormal sound from the belt when starting, it is necessary to check whether there is a problem with the belt in time.

If there is an abnormal sound of the belt, first check the assembly, this abnormal sound may be caused by the friction between the timing belt and the timing shell, you can loosen the screw on the formal shell for half a turn to observe whether the abnormal sound disappears.

Secondly, you can check the use of the generator belt, which may be the abnormal noise caused by the accessory belt.

If the noise occasionally comes from the engine compartment, open the front cover to carefully check for foreign objects, sometimes foreign body blockages will cause the vehicle to squeak, be sure to check it carefully, and develop the habit of checking the engine compartment frequently. If the vehicle is moving, there is a sizzling sound as soon as the brakes are stepped on, indicating that the brake pads are worn to the limit and have begun to grind to the brake disc, so you should go to the repair shop for maintenance as soon as possible.

There is a screeching sound when the engine starts, and that's the problem!

Timing belts belong to rubber parts, and with the increase of engine working time, timing belts and timing belt accessories, such as timing belt tensioners, timing belt tensioners and water pumps, will wear or age.

Therefore, all engines equipped with timing belts, manufacturers will have strict requirements, regularly replace timing belts and accessories within the specified cycle, and the replacement cycle is different with the structure of the engine, generally when the vehicle travels to 610,000 kilometers should be replaced.

The specific replacement cycle should be subject to the instructions in the maintenance manual of the vehicle. Timing belts are generally considered to be replaced at 80,000 km. Even if you have a timing belt in your car, you can't replace it if it breaks.

Abstract Hello,This situation may be a problem with the sound quality of the song,Or the wire connection is loose or the speaker itself is a problem,You can change a song,And then you can judge what the problem is** after a try. In fact, it is also possible that the speaker brocade wire is broken, or the speaker paper plate is damaged. You can go to um, your 4S store to inquire, or directly to your after-sales service.

Hope it can help you, thank you, dear.

When listening to a song in the car stereo, the horn suddenly makes a loud and piercing sound, what is going on?

Hello, this situation may be a problem with the sound quality of the song, or a loose line connection or a problem with the speaker itself, you can change a song, and then try it to determine whether it is a problem. In fact, it is also possible that the speaker brocade wire is broken, or the speaker paper plate is damaged. You can go to um, your 4S store to inquire, or directly to your after-sales service.

Hope it can help you, thank you, dear.

You can't put a radio, you should have a speaker.

Ah, that's the problem with the speakers.

It could be that the speaker's paper tray is damaged.

A lot of speakers, are they all broken?

Hello, of course not. Which one is going wrong? You also need to deal with it after the sale.

First of all, do you decide, when was the last time you changed the brake pads? How many kilometers did you change? Check how thick the brake pads are?

How many millimeters? Do brake discs have steps? The brake pad table can be polished first when the brake motor step is replaced.

If the thickness of the brake disc is not enough), in doing a brake maintenance, the laughter will disappear, remember to have a reputable, quality, guaranteed repair shop, I wish you a happy car.

Regarding the abnormal sound of the left front wheel of the car, there are the following situations:

1. If it is a clattering sound and abrupt, the faster the speed, the faster the sound, it is a foreign object on the tire, such as stones and nails. You can park your car and get out of the car to take a look.

2. If there is an intermittent gurgling sound or knocking sound when turning, crossing a hurdle, or walking a bad road, it may be that the outer ball cage and shock absorber of the left front half shaft are broken or the ball head of the chassis suspension is worn, and the bushing is worn. Go to the repair shop as soon as possible to check out potential safety hazards.

3. If you hear an obvious buzzing sound when driving, the faster the speed, the louder the sound, the biggest possibility is that the left front wheel bearing is broken.

To solve the abnormal noise, it is best to drive to the repair shop and ask the maintenance master to actually check it.