HS code utilization in digital trade documents

List of contents of this article:

• 1,HS code utilization in digital trade documents What are the reasons why the sound of the car engine becomes louder?
• 2, What is the reason for the abnormal noise in the engine
• 3, What's wrong with the abnormal sound in the engine
• 4, Does the car start the engine make a strange sound?

What are the reasons why the sound of the car engine becomes louder?

Add the wrong number of gasoline, or the gasoline is not qualified. If the car needs No. 97 gasoline, but add No. 93 oil, this will not only reduce the life of the engine, but also make it easier to produce carbon accumulation, but also make the exhaust gas black. At this time, the sound of the car engine is obviously louder.

Add the wrongly marked gasoline, or the gasoline is not qualified. If the car needs No. 97 gasoline, but add No. 93 gasoline, it will not only shorten the life of the engine, but also make it easier for the exhaust gas to turn black. At this time, the sound of the car engine is obviously louder. Nozzle atomization will also cause abnormal engine noise. Shock absorber failure.

The engine accumulates too much carbon. The engine oil is used inappropriately or the oil becomes dirty. In addition, most of the engine noise is caused by the abnormal noise of the engine: the screws under the engine are loose. A relatively common minor fault, tightening or adjusting the under-engine guard screw. The engine claw pad is aging.

What is the reason for the abnormal noise of the engine

The abnormal noise of the car engine may be caused by the high temperature due to the high load intensity of the engine, or the low oil pressure of the engine. Causes of abnormal noise in the car engine: engine overheating, engine carbon accumulation, poor oil, need to add high-grade oil; overheating of the engine, check the cooling system; blockage of the exhaust system.

The reasons for the loud engine noise include: oil filter problems,Poor sealing of the rubber ring, damage to the engine bearing, the cause of the exhaust pipe, and the louder noise than usual during cold start in winter are normal phenomena. Specifically, there are three main reasons for engine noise: the first category is combustion noise, which is related to the type of oil.

Oil: If the oil of the vehicle is too high, it is easy to cause problems with the operation of the engine, and the lubrication effect will become worse, resulting in loud engine noise. Therefore, at this time, you should go to the repair shop in time to check whether it is time to change the oil, or calculate by yourself whether the maintenance time has come.

Engine noise may be due to the following reasons. The rubber block laid between the engine and the frame - the foot glue is aging or loose. Its function is to reduce the vibration and buffering of the engine when it is working, and to give full play to the effect of fixing the engine. When these rubbers age or relax, they will produce engine vibration, and the faster the speed, the louder the vibration sound.

What's wrong with the abnormal sound in the engine

1. Abnormal sound of missing cylinder: The missing cylinder in the engine mainly means that one or more cylinders in the engine are not working properly, which usually shows that the exhaust gas flow discharged by the car has obvious At the same time, the exhaust pipe shakes so much that you can clearly hear the sound of the engine stuttering or fluttering.

2. Insufficient engine cylinder. When the engine lacks a cylinder, there will be problems such as loud engine noise, unstable idle speed, and abnormal body shaking. In this case, the condition of the cylinder and the working condition of the spark plug should be checked.

3. Caused by excessive carbon accumulation inside the engine or unqualified fuel use. Clean the accumulated carbon and replace the fuel to return to normal. The valve makes an abnormal sound.Especially after the cold car starts, the valve will make a "da-da" sound, and then the hot car will get better, because the oil precipitates in the oil pan shell and is not pressed up in time when the engine starts.

4. The reasons for the hysterical sound problem of the engine can be divided into air filter, spark plug, ignition line, gasoline, gasoline filter, gasifier, oil pump and other problems. Check whether the air filter is dirty, whether the spark plug is old and has to be replaced, the ignition coil is broken, the gasoline is not clean, for example, there is water in the oil line.

5. Reason: When the car is started in the cold, the sound of the engine will be slightly louder than when the car is hot. As long as the sound sounds uniform and soft and not harsh, there is generally no problem. This is because when the car is cold, the gap between the cylinder wall and the piston has not reached the optimal size, and the lubrication of the oil is not sufficient.

6. The reasons for the abnormal noise of the engine are: the analysis of the characteristics of the abnormal noise of the engine. The abnormal noise of the engine is usually related to the speed, load, temperature and working cycle of the engine. Through the characteristic analysis of the abnormal noise, its change law can be found.

Does the car start the engine make a strange sound?

Step 1: If there is abnormal noise in the engine compartment of the car, it means that the belt is usually loose or of poor quality, so check the engine belt first. If there are too many belts in the car, we can't tell which belt is wrong. We can start the car first and then pour some water on the belt.

Once the fuel of the car is insufficient, there will be a rattling sound when the engine is started, but it will also occur if it cannot start normally.It is necessary to check whether the fuel is sufficient. This problem is very easy to solve. You only need to add fuel in time.

Belts are rubber products, and rubber products will age and wear after long-term use. So the belt needs to be replaced regularly. If the belt is not replaced for a long time, there will be abnormal wear and loosening. In this way, there will be a strange sound when the engine is started. Everyone must change the belt of the car engine regularly when using the car.

The reasons for the abnormal sound of the car start and the solution are as follows: there is a sharp sound when the car starts.

This situation is caused by the thermal expansion of the ternary catalytic converter of the automobile, which is also a normal phenomenon and cannot be ignored. Transmission failure: One of the reasons for the abnormal sound of the car starting is the failure of the gearbox, which causes the friction of the inner gear to produce abnormal noise.This situation is relatively complicated. You need to go to the repair shop or 4s store to find a professional to check.