Why does the engine always rattle when the car is running?

There are many reasons why the engine suddenly makes noise when the car is running. Generally, this situation will be caused by aging or loosening of engine primer, improper use of engine oil and lack of engine cylinder.

In view of these problems, the reasons and solutions are listed below.

1, machine foot glue is aging or loose.

Foot glue is a rubber block between the engine and the frame. Its function is to reduce the vibration and buffer when the engine works and fix the engine. Once these feet are aged or loose, the engine will shake, and the faster the speed, the louder the shaking sound. The abnormal sound caused by this situation can be solved by fastening or replacing the foot glue.

2. Improper use of engine oil

On the one hand, if the viscosity of our engine oil doesn't match the engine, it is easy to produce carbon deposit, which will lead to the noise of the engine. On the other hand, if the oil viscosity is too low, it will lead to insufficient lubrication and abnormal noise caused by engine parts wear; Too high oil viscosity and too high engine load will also produce noise.

If it is found that the abnormal noise of the engine is caused by this situation, you can replace the engine oil with the engine oil label on the vehicle manual, and do not mix different brands of engine oil to solve it.

3. The engine stalled.

Engine cylinder shortage mainly refers to the abnormal operation of one or more cylinders of the engine, which is usually manifested as: the exhaust gas flow from the automobile is obviously intermittent, the exhaust pipe is seriously shaken, and the engine "chug" sound or plop, plop sound can be clearly heard. To solve this problem, it is necessary to check the working condition of each ignition coil and cylinder spark plug before deciding to repair or replace it.

Extended data:

The abnormal sound of the engine indicates that the technical state of the engine mechanical device has changed. The main reason is that some parts are worn or even improperly adjusted. Some abnormal sounds can indicate that the engine may be accidentally damaged, so when the engine has abnormal sounds, it should be repaired in time to prevent the fault from expanding.

Before disassembly, it is necessary to check and determine the fault position, and then analyze the abnormal noise characteristics of the engine, so that the position, cause and degree of abnormal noise can be basically diagnosed and the blindness of disassembly inspection can be avoided.

V-belt is the most common power transmission mode, which can be easily bought at an economical price and easily replaced. When the V-belt is worn or slack, the engine room of the car will make a "chirp" sound. If the V-belt is badly worn, it should be replaced.

References:

Baidu encyclopedia abnormal sound of car body