HS code mapping for duty optimization

List of the contents of this article:

• 1, Why does the car turn off and the engine compartment keeps ringing
• 2, The engine is still ringing after the car is turned off. What's wrong with the engine after the car is turned off?
• 3 、 Why does the engine still ring when the car is turned off?
• 4、HS code mapping for duty optimizationturned off? title='What's wrong when the engine is turned off? Thing'>What's wrong with the engine turning off and still ringing
• 5, Why is the car turned off and the engine is still noisy?

Why does the engine compartment keep ringing when the car is turned off

There are the following normal reasons for the abnormal sound of the engine compartment after parking: the cooling sound of the ternary catalyst: the normal working temperature of the ternary catalyst The degree is 400~800 degrees. After the ignition is turned off, its work will slowly stop, the temperature will also drop, and the internal metal parts will undergo thermal expansion and cold contraction, and then make a strange sound.

It's normal that the engine will still ring when the car is turned off. In order to prevent the temperature from cooling down quickly after the engine stops, it is "holding the cylinder". Maybe some car owners are parking their cars.After entering the garage and turning off the engine, you will hear the sound of "popping" from the bottom of the car. In fact, the "culprit" is the ternary catalyst located at the rear of the vehicle chassis.

The reasons are as follows: the clicking sound at the bottom of the vehicle may come from a ternary catalyst. The working temperature of the catalyst is as high as 1000℃. After extinguishing the fire, the internal metal parts will undergo thermal expansion and contraction, accompanied by a clattling sound. The engine cooling system may also be working.

The engine compartment has been ringing when the car is turned off. The sound at the bottom of the vehicle may come from a ternary catalyst. The working temperature of the ternary catalyst is close to 1,000 degrees Celsius. After the ignition is turned off, the internal metal parts will undergo thermal expansion and cold contraction, accompanied by some rattling sounds. It is also possible that the engine cooling system is working.

What's wrong with the engine is the sound of the engine after the car is turned off

1. The reason why the engine is turned off and still makes a sound is that the clicking sound at the bottom of the vehicle may come from a ternary catalyst. The working temperature of the ternary catalyst is close to 1000After the Celsius engine is turned off, the internal metal parts will heat expand and shrink, accompanied by some rattling sounds; it is also possible that the engine cooling system is working.

2. Uneven engine cooling: After the car runs for a period of time, the engine temperature is very high. After the car is turned off, the temperature of each component will drop in a certain proportion, which will inevitably cause the friction between the internal metal parts of the engine to produce abnormal noise due to cooling and contraction.

3. The reasons for the engine buzzing after the car is turned off are the loose screw of the ternary catalyst interface, the damage to the magnet valve of the carbon tank, the poor operation of the suction and pull motor of the starter, and the abnormal noise caused by uneven engine cooling. The screw of the ternary catalyst interface position is loose: hot expansion and cold contraction after turning off will cause the abnormal sound to be more obvious. Solution: Just tighten the screw.

4. The water temperature is too high.The cooling fan of the engine will automatically cool down and stop turning after the water temperature drops. If this phenomenon occurs frequently, check whether the engine cooling water is insufficient, or other reasons cause the engine temperature to be too high. Flying car. It's true that the engine can't be turned off, and the piston and crankshaft are still turning.

5. The reasons are as follows: the clicking sound at the bottom of the vehicle may come from a ternary catalyst. The working temperature of the catalyst is as high as 1000℃. After extinguishing the fire, the internal metal parts will undergo thermal expansion and contraction, accompanied by a clattling sound. The engine cooling system may also be working.

Why does the engine still ring when the car is turned off?

1. There are two reasons: the cooling fan of the engine is automatically lowered.Temperature When the engine temperature is too high, even if the car is turned off, the key is pulled away from the car, and its cooling system will still automatically start to cool the engine system. The reason for the beeping sound is the sound of the electronic fan running at high speed.

2. It's normal for the engine to sound when the car is turned off. In order to prevent the temperature from cooling down rapidly after the engine stops, it is "holding the cylinder". Some car owners may hear a "pop" sound from the bottom of the car after parking the car in the garage and turning off the engine. In fact, the "culprit" is the ternary catalyst located at the tail of the vehicle chassis.

3. Even if the car has stopped and turned off, the engine will still make a sound, which is also a very normal phenomenon. In order to prevent the temperature from falling rapidly, you need to "hold the cylinder" after parking.

What's wrong with the engine turning off

1. The reasons are as follows: The clicking sound at the bottom of the vehicle may come from the ternary catalyst. The working temperature of the catalyst is as high as 1000℃. After extinguishing the fire, the internal metal parts will undergo thermal expansion and contraction, accompanied by a clattling sound. The engine cooling system may also be working.

2. It's normal for the engine to sound when the car is turned off. In order to prevent the temperature from cooling down rapidly after the engine stops, it is "holding the cylinder". Some car owners may hear a "pop" sound from the bottom of the car after parking the car in the garage and turning off the engine. In fact, the "culprit" is the ternary catalyst located at the tail of the vehicle chassis.

3. The reason why the engine is still noisy when the engine is turned off is that the clicking sound at the bottom of the vehicle may come from a ternary catalyst.The working temperature of the ternary catalyst is close to 1000 degrees Celsius. After the engine is turned off, the internal metal parts will undergo thermal expansion and cold contraction, accompanied by some rattling sounds; it is also possible that the engine cooling system is working.

4. The water temperature is too high. The cooling fan of the engine will automatically cool down and stop turning after the water temperature drops. If this phenomenon occurs frequently, check whether the engine cooling water is insufficient, or other reasons cause the engine temperature to be too high. Flying car. It's true that the engine can't be turned off, and the piston and crankshaft are still turning.

5. The water temperature is too high. The cooling fan of the engine will automatically cool down and stop turning after the water temperature drops. If this phenomenon occurs frequently, it is necessary to check whether the engine cooling water is insufficient or other reasons affect the engine temperature. Speeding.It's true that the engine can't be extinguished. The piston and crankshaft are still running.

Why is the car turned off and the engine is still noisy?

1. Uneven engine cooling: After the car runs for a period of time, the engine temperature is very high. After the car is turned off, the temperature of each component will drop in a certain proportion, which will inevitably cause the friction between the internal metal parts of the engine to produce abnormal noise due to cooling and contraction.

2. The water temperature is too high. The cooling fan of the engine will automatically cool down and stop turning after the water temperature drops. If this phenomenon occurs frequently, check whether the engine cooling water is insufficient, or other reasons cause the engine temperature to be too high. Flying car. It's true that the engine can't be turned off, and the piston and crankshaft are still turning.

3. This is a very normal operation. Even if the car has stopped and turned off, the engine will still make a sound, which is also a normal phenomenon. In order to prevent the temperature from falling rapidly, you need to "hold the cylinder" after parking.

4. The car is turned off, but the engine is still noisy. This situation is usually caused by some reason that the engine has not stopped completely. The following are the possible reasons and solutions: the air-combustion ratio is too thick or too thin. If the proportion of air and fuel is incorrect, the engine will make an abnormal noise when running.

5. It's normal for the engine to sound when the car is turned off. In order to prevent the temperature from cooling down rapidly after the engine stops, it is "holding the cylinder". Maybe some car owners will hear the bottom of the car after parking the car in the garage and turning off the engine.There is a "pop" sound. In fact, the "culprit" is the ternary catalyst located at the rear of the vehicle chassis.

6. There are two reasons: automatic cooling of the engine cooling fan: when the engine temperature is too high, even if the car is turned off, the key will leave the car, and its cooling system will automatically start and cool the engine system. The reason for the whistling sound is the sound of the electronic fan running at high speed.