The car is turned off, and the car is still buzzing, what s going on?

There is a buzzing sound after the car is turned off, and it is likely that the fan is still coming out, and sometimes the water temperature is turned off at a relatively high state.

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When the car turns off, the car still has a buzzing sound, which is due to inertia, and after the engine is turned off, there will be a sound of Weng Weng because the inertia is still rotating.

The sound of the car's cooling fan is working, and the vehicle engine needs to be cooled when it reaches a certain temperature.

After the car is turned off, some vehicles have cooling fans that are still running, the purpose of which is to cool down the engine. This is quite normal.

There is a humming sound inside the hood after the car is turned off, and it is the fan that continues to rotate to lower the temperature of the engine.

The sound of the fan, the fan may work for a while and then turn off.

The reason why there is still a sound after the car is turned off is: the cooling sound of the three-way catalytic converter: the normal working temperature of the three-way catalytic converter is 400 to 800 degrees Celsius, and its work will slowly stop after the ignition, the temperature will drop, and the metal parts inside it will expand and contract, and then make abnormal noises; The cooling sound of the exhaust pipe:

When the load of the car is high or there is a mixture of gas burning in the exhaust pipe, the temperature will be higher, and the exhaust pipe will expand and contract, making abnormal noise; Abnormal noise caused by uneven engine cooling: After the car has been driven for a period of time, the engine temperature is very high, and the friction causes abnormal noise due to the cooling and contraction of the gaps between the metal parts inside the engine.

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This is normal. It is to prevent the temperature from cooling down quickly after the engine is stopped. After driving for a period of time, the temperature of the engine parts is very high, and if the engine is stopped, the cylinders in the engine, the piston rings, the crankshaft and the connecting rod and other running parts will stick together due to the high temperature.

When the next time it starts, there may be a phenomenon of clenching, which is often called holding the cylinder and bursting the tile.

1. The external equipment is not removed after the ignition is turned off: the external equipment of the car is too much, and many times the mobile phone will continue to be connected and charged after the fire is turned off.

2. Frequent start of the vehicle after the ignition: This phenomenon occurs on novice users, often because the driving is not skilled enough, resulting in the automatic shutdown of the vehicle, and the start-up is carried out in a hurry, so the repeated operation back and forth will cause damage to the vehicle engine and some equipment.

3. The role of start-stop technology is to reduce fuel consumption when the vehicle is in the condition of the traffic light, the car will be turned off, so as to reduce the generation of fuel consumption to achieve a more economical fuel situation, but the vehicle will be automatically started when the engine is turned off, which invisibly increases the fuel consumption of the car, so this equipment has been in a state of incomprehension, and many users will give up this function.

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The sound of the engine cooling fan, the electronic fan continues to work for a period of time after the ignition is turned off, and the heat dissipation of the engine coolant circulation system is generally occurring after driving for a long time or driving for a long distance in summer, which is normal.

After the car turned off, the engine whirred for a while, because the engine could not be turned off; or thermal expansion and contraction of automobile exhaust pipes; The engine cooling fan is automatically cooling, or other electronic devices are automatically balancing the temperature inside and outside the car, and the buzzing will last for about 10-20 minutes.

It is normal, this is because the temperature of the engine will increase correspondingly after continuous high revolution, the engine is very hot, when the temperature of the cylinder block is unevenly reduced after stopping, the metal seams are cooled and contracted, and this sound is produced by the friction between the metals.

In order to protect the normal cooling of the engine after the engine is turned off, the temperature sensor will control the electronic fan to run for a period of time, and it will be normal after reaching the specified temperature.

The temperature inside the engine rises, and the heat dissipation (cooling) on the outside is a physical phenomenon of thermal expansion and contraction, which is basically a phenomenon in all cars, and the sound will disappear except for the reduction of the temperature difference between the inside and outside of the engine.

After the car is turned off, if it is because the driving time is too long, then the cooling system will still be running for a period of time, so that the car can be quickly cooled down, so it is generally normal!

After the car stalled, there was still a humming sound, probably because the engine was still spinning even though the engine was turned off.

The car buzzes all the time after it is turned off to prevent the temperature from bursting after the engine is stopped.

1. Reason: After the car is driven for a period of time, the temperature of the engine parts is very high, if the car is stopped, the cylinder and piston ring, crankshaft and connecting rod and other running parts in the engine will stick together due to the high temperature.

2. Solution: There may be a phenomenon of holding on to the next start, which is often called holding the cylinder and bursting the tile. Therefore, if you drive for a long time, when you need to stop, it is best to park the car in place and idle for a few minutes to let the engine temperature drop naturally before stopping.

This is the ...... that after the engine is turned off, the temperature has not dropped to the normal value, and the cooling fan will continue to dissipate heatSo there will be sounds.

It is normal for the front of the car to still hum after the car is turned off, and it is the sound of the radiator fan.

If the engine temperature of the car is too high, even if the engine of the car has been turned off, because the water temperature in the engine of the car cannot drop in a short time, it will not affect the normal operation of the radiator, and the radiator is still discharging heat for the engine of the car. When the car's engine system is cooled to a suitable temperature, the fan will stop turning.

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.

After stopping the fire, the electronic fan of the water tank will run to cool down for a period of time, and the higher the water temperature, the longer the running time.

The buzzing sound after the ignition is the sound of the electronic fan running, after the ignition is turned off, in order to protect the engine to cool down normally, the temperature sensor will control the electronic fan to run for a while, and it will be normal after reaching the specified temperature, which is a normal phenomenon after my Tiguan is turned off.

There are three holes in the engine cylinder block, namely the air intake, exhaust and vent, which are closed by the piston at a certain moment. Its duty cycle consists of two strokes:

The piston moves upwards from the bottom dead center, and after the three holes are closed at the same time, the mixture entering the cylinder is compressed; When the air intake hole is exposed, the combustible mixture flows into the crankcase. Second stroke.

When the piston is compressed near the top dead center, the spark plug ignites the combustible mixture, and the gas expands to push the piston downward. At this time, the air intake hole is closed, and the combustible mixture sealed in the crankcase is compressed; When the piston approaches the bottom dead center, the exhaust hole is opened, and the exhaust gas is flushed out; Then the vent is opened, and the pre-pressurized combustible mixture is rushed into the cylinder to expel the exhaust gases and carry out the ventilation process.

As the compression stroke approaches the top dead center, the spark plug mounted above the cylinder head emits an electric spark that ignites the compressed flammable mixture. After combustible mixture combustion, a large amount of heat is released, and the gas pressure and temperature in the cylinder rise rapidly, the maximum combustion pressure can reach 3 6MPa, and the maximum combustion temperature can reach 2 200 2 500. The high-temperature and high-pressure gas pushes the piston to move rapidly to the dead center, and works externally through the crank connecting rod mechanism.

It is normal for the car to have a sizzling sound after the car is turned off, this is because the temperature of the engine will increase accordingly after continuous high rotation, the engine is very hot, when the temperature of the cylinder block is unevenly reduced after parking, the cooling and contraction between the metal joints, this sound is the friction between the metals.

Hope it helps!

There is still a sound of the engine after the car is turned off, because the engine cannot be turned off; or thermal expansion and contraction of automobile exhaust pipes; The engine cooling fan is automatically cooling, or other electronic devices are automatically balancing the temperature inside and outside the car, and the buzzing will last for about 10-20 minutes.

After the car turns off, the car still has a buzzing sound, this should be the sound of the car's three-way catalytic converter, when the car turns off, the three-way catalytic converter will continue to work for a while.

If the engine runs at a high temperature for a long time, the electronic fan of the water tank will continue to run for a period of time to cool down after the fire is extinguished.

This is normal. It is to prevent the temperature from cooling down quickly after the engine is stopped.

The humming sound is not the engine ringing, but the cooling fan.

The normal working temperature of the engine is basically maintained at about 90, when we stop and turn off, the temperature of the engine will not drop immediately, and with the accumulation of residual heat of the engine, it is easy to damage the plastic parts inside the engine compartment and the wiring harness, and may even cause spontaneous combustion of the vehicle.

At this time, the cooling fan needs to continue to work after the vehicle is stopped and turned off (under normal circumstances, the cooling fan takes power directly from the battery, so the power failure does not affect its work) to dissipate heat for the engine. When the engine temperature drops to a certain value, the cooling fan will automatically stop working.

Precautions for car parking.

When car owners park in a parking space or garage, they generally turn the steering wheel to reverse the car, but many car owners do not turn the steering wheel back to the right after parking, and get out of the car when the steering wheel is in a state of death. And this behavior makes the steering system of the car will always be in a state of stress, so that the gear of the steering system and the steering tie rod are different in the position of the stress point.

The accumulation of a long time will cause certain damage to the steering system of the car, resulting in the wheel deviation phenomenon in the process of driving the car in the future, affecting the driving safety of the owner. In addition, car tires are stressed due to sidewalls, which can also cause tire deformation over time.

When it is started next time, there may be a phenomenon of clenching, which is often called holding the cylinder. If you drive for a long time, when you need to stop, it is best to park the car in place and idle for a few minutes to allow the engine temperature to drop naturally before stopping.

The first thing is that the external power supply is not turned off after the ignition, the car is no longer used as a means of transportation, a lot of external equipment makes the car more and more convenient and comfortable in the process of driving, including air purifiers and other electrical equipment, many car owners do not turn off the external power supply after turning off the engine, then these external equipment will get power from the battery, which indirectly affects the performance of the engine.

The second is not to turn off the air conditioner after the engine is turned off, for the owner, how comfortable the cool air conditioner is in the summer, I believe everyone knows that the power of the air conditioner is the engine. After the owner turns off, then the engine will also stop running, but once you start the car suddenly, the engine will drive the air conditioner, causing a burden on the air conditioner, which will greatly reduce the life of the car.

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. Models equipped with turbocharged engines are different; 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 due to their lack of understanding of mechanical knowledge, they mistake reasonable abnormal noise as a vehicle failure.

Therefore, learn to 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.