What causes a car s engine to be loud?

The first method is to add sound insulation to the engine.

Car noise is often caused by the engine, after all, the engine will vibrate when it is running, and then it will cause noise. Therefore, we can add sound insulation materials around the engine to absorb the noise generated by the engine, which can naturally reduce the transmission of noise. However, when installing sound insulation materials, do not ignore the engine heat dissipation.

The second method is to replace the door seal.

Some cars have very little noise, but after a long period of use, there will be more noise, this situation is mostly because the sealing strip has lost its original effect, at this time you can replace the door sealing strip, so that the effect of car sound insulation is restored. When choosing a sealing strip, it is necessary to choose a flexible sealing strip, which has a better sound insulation effect.

The third method is to install soundproof cotton.

If the sealing strip does not solve the problem, then the car can only be equipped with sound insulation cotton. In fact, many parts of the car have soundproof cotton, and its function is to block noise, but car companies do not install soundproof cotton in all parts due to the consideration of car manufacturing costs. Therefore, if the owner is willing to spend money, he can install soundproof cotton for the whole car, which can minimize the impact of noise.

The fourth method is to replace tires with low noise.

The friction between car tires and the ground will produce noise, and the noise produced by different tires is also different, so we can replace a more silent tire, which solves the problem of tire noise from the root. If you don't want to spend so much money on changing tires, then you can insulate the fenders, which can also have a certain effect.

As long as these four items are done, car noise is a minor problem, but it is still a bit expensive to sit down in a full set, so we can choose one or two to carry out. Of course, if you don't want to spend money and the noise is tolerable, then you can just turn up the sound of the stereo so that the noise is not heard.

It seems that the sound of the engine starting the engine of the turbocharged car will be louder when it is cold, it should be normal, if you are not at ease, you can go to the 4S shop to check it.

A sudden increase in engine noise may be due to the weather. When the weather is cold, the engine idle speed increases, and the engine of the cool car always keeps the speed high, and you will feel the engine sound louder. This situation is normal and there is no need to worry, almost all cars will have an increase in engine idle speed in winter.

When the car is hot, it goes down sharply.

Causes of car engine noise:

1. Engine oil: If the viscosity of the vehicle's oil is too high, it is easy to cause problems in engine operation, and the lubrication effect will deteriorate, resulting in high engine noise. Therefore, at this time, you should go to the repair shop in time to check whether it is time to change the engine oil, or calculate whether the time for maintenance is up.

2. Belt: Check whether the belt is loose, sometimes the belt is loose, which will cause the engine compartment to become louder.

3. Water temperature: If the engine is noisy, it is also possible that the water temperature is too high, and it is necessary to see whether the water temperature gauge is normal and whether there is smoke in the engine compartment. Be sure to change the coolant before winter.

4. Idling: If you feel that the noise is relatively loud when idling, and the idle speed of the vehicle is high, it is likely that your car's throttle, air intake, and fuel injector should be cleaned, especially the throttle.

5. Sound insulation: If you listen to the normal operation of the engine outside, and feel that the noise is too loud when you sit in the car, it means that the sound insulation effect of your vehicle is very poor. The vehicle's seals should be inspected to see if there is any signs of aging. Or increase the sealing effect of the vehicle and try how noisy it is.

The loud car engine may be caused by the car running too many kilometers, or the age of the car is too high, of course, if it is not properly maintained, it will also cause the car engine to be loud.

It should be that the engine oil is running out, and the noise is so loud that the friction is very strong, so it is recommended to change the oil quickly.

1. The engine lacks cylinder and makes abnormal noise.

Engine cylinder shortage mainly refers to the engine has one or more cylinders are not working normally, which is generally manifested as: the exhaust gas flow of the car has obvious intermittent flow, and the exhaust pipe shakes badly, and the engine can be heard clearly"Sudden protrusions"Or a plop, plop sound. This phenomenon has a lot to do with the failure of the ignition coil.

2. The sound of "oh oh".

It's a bit like the sound of a pencil hitting a table, which increases when the engine speed increases. The possible cause is that there is dirt inside the engine, it is recommended to change the oil, filter, and wash the engine. Others could be valve problems.

3. Abnormal noise in the engine compartment.

In fact, this is because after the car is parked for a long time, almost all the lubricating oil flows back to the oil pan, and the oil pump can not establish the oil pressure at the first time during the cold start, and the oil film is formed between the components, especially the valve inside the cylinder head (upper), which is not lubricated during the cold start, whether it is a hydraulic tappet or a mechanical rocker arm, there will be a certain valve clearance or due to the oil pressure is not enough to time the chain (with intelligent variable valve or valve lift system) fails to work normally to cause a clicking sound. In addition, there is another element of the engine that also makes a clicking sound - the canister solenoid valve (cleaning valve).

4. The sound of "dangdang".

This is due to poor lubrication conditions, excessive wear of the piston and cylinder wall, resulting in the gap fit tolerance between the piston and the cylinder wall exceeding the normal range, and the piston skirt and the cylinder wall collide when the engine is running, resulting in a crisp sound of "dangdang", which is generally more obvious when running at idle or low speed.

5. The sound of "hiss".

It's a bit like gas coming out of the engine, and when you hear this sound, the engine will quickly lose power. The cause is that the engine is overheating, checking the cooling system, the exhaust system is clogged, the vacuum tube is leaking, or it is broken. Although it is a common fault, it will lead to the occurrence of engine power, economic decline, and in serious cases, damage to parts, so such faults should be eliminated and repaired in time.

6. There is a sharp "squeak" noise in the engine.

Summer is coming, and it's a pleasure to drive with the air conditioning in the car, but when you slow down, the screeching sound of the engine is particularly damaging to your mood. The reason may be that the driving belt is slipping, the direction is too much, hitting to the limit, the belt is too loose, and tightening the belt can be solved. There will also be a sharp sound of metal parts rubbing when the engine is running, which is generally the cause of damage to the bearings of generators, water pumps, and power steering pumps.

1. There is carbon deposit.

Because the old engine oil becomes thinner and thinner the more you use, there is more and more carbon deposit. The oil is thin and easy to channel the oil, resulting in more and more carbon deposits and a lot of power loss. When the oil is changed, the engine does not adapt to the viscosity of the oil, which can increase the revs, which in turn causes the engine to be noisy.

2. The sound insulation is not good.

If you listen to the engine running normally from outside, but feel that the noise is too loud when you sit in the car, it means that your vehicle is poorly insulated. The vehicle's seals should be inspected to see if there is any signs of aging. Or increase the sealing effect of the vehicle and try how noisy it is.

3. Coolant.

Everyone knows the role of coolant, when it is too low, it is likely to cause problems, and the engine noise will also become louder, which should be checked and replaced to avoid other problems.

4. The shock absorber sounds.

We all know the role of shock absorbers, generally when we cross the speed bump, we can feel whether the shock absorber on the car is good, when there is a problem with the shock absorber on the car, there will be a problem of engine noise.

5. Engine deflagration and detonation.

When there is detonation, that is, after the spark plug jumps, the phenomenon of spontaneous combustion occurs at the end of the combustible mixture, at this time, the flame center formed by the spark plug ignition mixture and the new flame center formed by the spontaneous combustion of the end mixture are in the opposite direction, and propagate at the speed of impact, resulting in a sharp knocking sound and increasing the engine noise.

There are several reasons why a car engine is loud:

1. Valve leakage.

The main reason is that when the valve seat is hinged, due to improper operation or excessive wear of the inner hole of the valve guide, the valve seat is inclined or the valve gap is small, resulting in valve ablation and valve leakage caused by valve ablation.

Solution: Remove the cylinder head, grind the valve, check the elasticity of the valve tension spring, and adjust the valve clearance from the beginning.

2. The valve is knocking.

When the engine is idling, there is a series of knocking sounds between the tail end of the valve stem and its driving parts, which increases with the increase of speed, and there is no change in the movement and static when the engine temperature is changed or the fire is off.

The primary reasons: 1. There is a change in the gap between the adjusted valve (poor locking, wear between the valve stem and the driving parts), and the valve is not adjusted well.

2. The valve adjustment screw is worn, the lock nut is loose, and the valve gap is too large or ambiguous.

3. The valve tension spring seat is worn out of the groove, and the valve stem and duct are worn too much.

Solution: Adjust the valve clearance from the beginning, if the lock nut on the adjustment screw is loose, it should be locked firmly to replace the severely worn parts.

3. The valve seat rings and the seat ring falls.

The appearance of the valve seat ring is rough, the machining accuracy is unqualified, the interference of the seat seat is not properly selected to form a loose space, the material selection is improper, the deformation is too large after heat, or the inlay process of the valve seat does not meet the requirements.

Solution: According to the requirements of the installation process, the valve seat is installed from the beginning, the upper end face is flush with the body plane, and the higher part should be leveled.

4. The viscosity of the engine oil is too large This condition is special and rare. It is found in more advanced models, and the valve tappets of the valve system use hydraulic tappets, such as Hongqi, Audi, Santana and other cars. The hydraulic tappet ensures zero valve clearance and essentially eliminates valve rings.

At this moment, the oil plays a role in the hydraulic tappet, and because the engine speed is very high, the frequency of oil flow in and out of the hydraulic tappet is also very high. When the viscosity of the oil is large, it will inevitably form a lack of oil intake each time, the response of the hydraulic tappet lags behind, the corresponding tappet extension length is not good, and the valve gap increases, resulting in the sound of the valve.

If the valve rings due to the high viscosity of the oil, simply change the oil with a lower viscosity to solve the problem.

Hello If the car engine is very loud, it may be caused by not changing the oil for a long time, or it may be caused by the wrong viscosity of the selected oil, the oil is called the blood of the engine, the oil plays the role of lubrication, cleaning, heat dissipation and sealing in the engine, if the engine lacks oil, the engine will not work normally, when the engine is working, the oil will form an oil film on the surface of each part of the engine, so that the friction of the various parts of the engine will be reduced, if the oil is used for a long time, The oil will be thinned, so that the engine will become louder when accelerating, if the viscosity of the selected oil is not right, the noise of the engine will also become larger, the general naturally aspirated engine only needs to use 30 viscosity oil, turbocharged engines need to use 40 viscosity oil, if it is a high-performance large-displacement naturally aspirated engine, generally need to use 60 viscosity oil, when choosing oil, it is recommended that you buy fully synthetic engine oil produced by big brands, although fully synthetic engine oil ** is more expensive, However, the lubrication effect is better and the service life is longer, so it is recommended that you change the oil regularly, which is good for the engine.

Many car owners complain that the noise of their cars is getting louder and louder, what is the reason?

.The engine overheated and caused the engine to lose power. If the engine is so active for so long that the surface overheats, the cooling system will strike. The first thing to do at this time is to check the cooling system, if there is a problem with the air conditioning system, it is possible.

2.There is a problem with the inside of the engine, such as a clogged valve. When we are driving, sometimes we can't see it from the outside.

3.The engine has a sound similar to "spraying", and it is recommended to change the oil. There is also a more unpleasant engine sound, the maximum probability.

4.The engine makes a sound similar to a lap, mostly due to problems with the cylinder valves. The engine is running when if it is emitted something similar.

In this case, there are usually two possibilities, one is that the car engine needs maintenance, and just changing the oil can solve the problem. One is that a car with a turbocharged engine adds 92 gasoline, which causes high engine noise due to the poor knock resistance of 92 gasoline, and the problem can be solved as long as 95 gasoline is added.

1.Too much carbon deposit, because the old engine oil is used more and more thin, so more and more carbon deposits, the oil is thin and easy to channel the oil, resulting in more and more carbon deposits, loss of a lot of power, when changing to new oil, the engine can not adapt to the viscosity of the oil, may pull up the speed, and then cause.

2.Low temperature cold start, because the engine lubrication system is not in the best lubrication condition at low temperature, each component due to the factors of thermal expansion and cold contraction.

3.If you listen to the engine running normally from the outside, but you feel that the noise is too loud when you sit in the car, it means that your vehicle is poorly insulated.

4.Engine valves are damaged, whether engine valves, bearings and pistons.