What does it mean when my car is in gear and there is a loud screeching sound when it starts?

Hello, it is advisable to check the brake pads.

1. If the clutch is not completely separated, the gear shift operation is carried out, which causes the gear sound to occur during gear shifting, and it is easy to cause tooth beating;

The solution to the abnormal noise in the car gear:

1. Check whether the reverse gear synchronizer has a tooth beating phenomenon when there is an abnormal noise. The abnormal noise is generally caused by the failure of the reverse solenoid valve, reverse pressure accumulator and buffer, and it is recommended to go to the local 4S store for testing and maintenance;

2. The car synchronizer is a device inside the gearbox, which plays a role in smoothly meshing the gear when we change gears while driving. In addition, in order to distinguish it from the forward gear, most cars do not have a synchronizer in the gearbox reverse gear, which is why the reverse gear is more difficult to hang than other gears, and sometimes there is an abnormal sound when the reverse gear is engaged;

3. The reverse gear is the gear that realizes the backward function of the whole vehicle, and its driving direction is opposite to the forward gear. In the five-speed manual transmission, its position is mostly set under the fifth gear, and the six-speed transmission is mostly set to an independent gear area, which can avoid the phenomenon of mistakenly hanging reverse gear when the user is moving forward to the greatest extent. The most direct manifestation of reverse gear damage is abnormal noise when driving in reverse gear, and it should be inspected and repaired in time to avoid greater damage.

If the reverse gear is not repaired in time after damage, debris may cause damage to other gears or bearings, or even make the entire gearbox ablative and unusable;

4. The driver who is more proficient in driving operation is relatively fast when changing gears, and the gear shift operation is carried out when the vehicle is not completely stopped or the clutch is not fully stepped on the bottom, so there is a situation of abnormal gear shifting, and the probability of damaging the reverse gear gear will be greater;

5. In addition, the driver who is accustomed to driving an automatic transmission vehicle suddenly drives a manual transmission vehicle, and sometimes forgets to step on the clutch, and it is easy to damage the reverse gear when hanging the reverse gear.

The squeak in reverse gear is due to the collision of the gears when the gear is in gear. Reverse gears without synchronizers are prone to this problem. Generally, there is no need to repair it. Caution when operating:

1. The car should be completely stopped, 2. If there is a squeak, return to the neutral gear first, release the clutch and then step on it, and then hang the reverse gear, and there will generally be no sound. If it still appears, repeat again.

3. Once there is shift noise, do not force the gear, otherwise the repair cost after breaking the gear is very expensive.

It's not a big problem, it's the gearbox.

Where the gear is stuck, it will only appear when going up and down a hill, or when it is parked at a slight slope, and it will not affect the vehicle much. But it's best to avoid such a situation.

After stopping at a ramp, press the brakes and pull the handbrake.

Then lift the foot that steps on the brake, and when starting the car, also step on the brake first, put the gear, and then release the handbrake. Don't step on the brakes and release the handbrake before putting the gear. It won't be what you said. If you explore it yourself, you can find the feeling. Automatic.

And manual transmission will have, first of all, the automatic transmission, when the automatic transmission is hung into the R gear, there is a click, I analyze that it may be caused by these two reasons, if it is from the P gear hanging R gear, it may be because you are in the parking place, not very flat, a little slope, so that the P gear will eat more force, when the P gear is pulled back when it is rough, this locking mechanism is tighter.

There will be a click, which is actually not from the inverted wax block, but the P block, and there is no need to worry about whether there are any common faults if there is really this sound.

This is also a normal situation, the next time you stop on the flat road, there will be no such sound, and the second situation will lead from D to R to make a sound.

Then it may be that the car has not completely stopped and pushed the R gear, the transmission gear is still rotating, and you immediately overturn the gear, which will definitely make a sound.

After the car is completely parked, it is impossible to make a sound when changing the car gear, and then the manual gear, because the reverse gear of the manual gear is not synchronized controller.

1) The transmission housing is damaged, and the transmission housing and bearing housing hole are worn and deformed for a long time. The sound of this training is the largest when it is engaged in the low speed gear, and the sound decreases gradually as it is engaged in the high speed gear, and the direct gear is the smallest.

2) Impact during meshing due to the fragmentation of individual gear surfaces. When this gear is engaged, there is a strong shock and vibration that resonates with the transmission housing.

3) The transmission is not properly assembled, the gears or needle roller bearings and bushings of a certain gear of the transmission are not properly replaced, and the assembly clearance is abnormal, resulting in poor gear meshing and abnormal noise during transmission.

The solution to the sound and abnormal sound of the car gear:

1. The clutch must be stepped on in place;

2. Check the linkage mechanism and tighten it;

3. Replace the damaged clutch plate;

4. Master the correct method of tagging, and the stall must be in place; ‍

5. The clutch is not clear from the imitation shed, and the clutch is checked;

6. The gear lever is loose (the connecting rubber sleeve is loose), and the gear lever is tightened;

7. The internal failure of the gearbox (synchronizer failure) will cause the abnormal sound of the big bucket gear, sometimes the abnormal sound is normal, such as the abnormal sound caused by stepping on the clutch not to the end or the car does not stop and hanging the reverse gear.

Let's see where it is. If it's just from the handle when the gear is in gear, it should be on the synchronizer, and it doesn't have any effect.

This sound may be caused by the clutch not being pressed to the bottom and causing the gearbox gear to collide when the gear is in gear, and once in a while, it has little effect.

Hello There are certain disadvantages, but not a big problem.

Hello! The specific reasons for the squeaking sound of the gear lever of the automatic transmission car are as follows: 1. It is possible that the parking place is not flat, a little slope, and you brake hard enough, which will cause the situation you said, the next time you change from P to D.

Solution: Just use a little force on the brakes, especially when you first start. 2. If it is a click, it is because there is no synchronizer in reverse gear, so it is not easy to hang, there will be a sound solution:

Go to a professional repair shop to check the following. 3. The reason for the control valve may be that the slide valve is not working properlySolution: it is recommended to check the amount of oil in the gearbox, if there is no shortage of oil, it is the transmission clutch slippage, and it is necessary to go to a professional maintenance shop for maintenance.

Summary: There is a squeak sound in the gear lever of an automatic transmission car, which will have a certain impact on the use of the car. Be sure to find out the problem in time and carry out maintenance or repair to prolong the life of the car.

If there is a squeaky sound in the hanging unit, it is likely that you hung up the crack in the gearbox inside the gear box, and you used to interfere.

If there is an abnormal sound when the gear is engaged, it may be that the clutch has not been stepped to the bottom, and it may be that the gear has a tooth beating. There are many reasons for abnormal gear shifting, and it is recommended to go to a professional repair shop or 4S shop to check the gearbox and clutch after this happens.

The reasons for the noise in the gear are improper operation, clutch failure, sprocket wear, and chain looseness.

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 seep into Chang to avoid unnecessary disassembly, first of all, we must distinguish between normal sound and abnormal sound. The normal vibration sound of each cluster system component (such as the noise on the engine surface), 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 damage to the grinding belt of the machine is not large, and there is no significant change for a long time, and this kind of fault can still maintain the normal driving 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.

1: The clutch is too low, the adjustment cannot be changed, the clutch plate and disc 2: what gear sounds, what gear of the synchronizer or the main and driven gears are damaged.

This one is fine, the car is fine, normal.

There are several possible points of failure for analyzing the cause:

1.Clutch pedal shaft: the lack of oil in the nylon sleeve will produce abnormal noise;

2.Clutch release lever: The lever fulcrum is a spherical bulge, and the overload of the clutch will cause the grease to dry up early and cause abnormal noise;

3.Clutch release bearing and sliding sleeve: Dry grease from bearings and sliding sleeves will cause abnormal noise in the clutch pedal.

Extended Materials. The clutch pedal is the control device of the clutch assembly of the manual transmission car, and it is the "human-machine" interaction part of the car and the driver. In learning to drive or in normal driving, it is one of the "five major control parts" of car driving, and the frequency of use is very high, for convenience, people directly call it "clutch".

Whether it is operated correctly or not directly affects the starting, shifting and reversing of the car.

There are eight aspects of clutch operation that need to be paid attention to

1. Pay attention to the correct posture of stepping on the clutch. The clutch pedal should be controlled using the forefoot. When pedaling the clutch pedal, place the ball of your foot on the clutch pedal with your heel against the ground, and keep your knees slightly bent when the clutch is at its lowest point.

Never step on the pedal with your toes or lift your heels off the ground to avoid insufficient strength or slipping

2. Pay attention to the lowest point when stepping on the clutch. Avoid the clutch being engaged for a long time, and make sure that the clutch is completely disengaged and does not wear out

3. Pay attention to the timing of clutching. When driving, don't loosen the clutch too quickly or deliberately increase the engine speed too high. This accelerates the wear and tear of the clutch

4. Pay attention to shift gears only after fully pressing the clutch pedal

5. Note that when pressing the clutch pedal, the accelerator pedal should be released quickly

6. Pay attention to the clutch operation to match the hand shift action. When the hand fails to shift smoothly, you should release the clutch first, then step on the clutch once, and then shift gears, do not force the gears, otherwise it will cause friction in the gears of the transmission, resulting in cup loss

7. Note that when driving, the left foot should not always be placed on the clutch pedal

8. Note that when driving, no matter what happens, do not press the clutch pedal with your right foot.

1.The car shifts gears loudly because the gears rub when they shift. There is no synchronizer in the reverse gear, which is easy to cause this problem.

Generally, no repairs are required. Hear a squeak when changing gears. A slight noise is normal, but a lot of noise is not normal.

The Qiling Li car shifts very loudly because the gears rub when changing gears. There is no synchronizer in the reverse gear, which is easy to cause this problem. Generally, no repairs are required.

Hear a squeak when changing gears. A slight noise is normal, but a lot of noise is not normal.

2.Due to the fragmentation of individual tooth flanks, the impact during the meshing process is caused. Strong shocks and vibrations are generated when the gears are meshed, causing the transmission.

Resonance of the shell. Due to the fragmentation of individual tooth flanks, the impact during the meshing process is caused. Strong shocks and vibrations are generated when the gears are meshed, causing resonance in the transmission housing.

The gearbox is damaged, and the gearbox and bearing seat are slowly worn and deformed for a long time. This training noise is greatest at low gears. With high gears, the noise gradually decreases, and the straight gear is minimal.

The external drivetrain of the transmission is in such a poor technical condition that it can cause collisions and vibrations when in use.

3.This causes the transmission to resonate and produce resonant noise. This noise tends to be irregular and occurs occasionally within a certain range of speeds. Noise caused by other factors in the transmission of disturbances, such as the number of logarithms of gears working at the same time.

Speed, working specification, load, lubricating oil is too little and many other factors, some noise can be eliminated by non-dismantling inspection, some can not be eliminated, only after all parts meet the technical requirements can be completely eliminated, especially the gear as far as possible to replace in pairs to ensure that the gear meshing is good. When installing other parts, pay close attention to the clearance of each part to make it compliant.

4.The clutch cable is too loose, causing the clutch plates to disengage from the flywheel and pressure plate, gearbox.

There is a problem inside. Since we weren't sure if there was a problem inside the gearbox, we first checked the tightness of the clutch cable. After tightening the clutch cable, we started the engine, pressed the clutch pedal, let the engine stop the power transfer with the shift, and then hooked up the reverse gear.

I found that the abnormal noise did not come out again. After a few more attempts, make sure there are no unusual noises, and then turn off the engine. What can now be confirmed is that the clutch did not disconnect clearly due to the loose connection between the clutch and the cable, and the squeak and screak were caused by the clutch not completely interrupting the engine's power when reversing.