What is the cause of abnormal engine jitter?

The maintenance of the automobile engine is directly related to the service life of the automobile, and the abnormal vibration of the engine is also a common fault. Then the causes of abnormal engine jitter are as follows:

one
Aging or loosening of engine foot glue
The foot rubber is a rubber block placed between the engine and the frame. Its function is to reduce the vibration and buffer when the engine is working, and to fix the engine. Once these foot glues are aged or loose, the engine jitter will be extremely obvious during cold start.
two
Dirty air filter
The air filter is designed to protect the engine and reduce wear. Generally, it is recommended to replace it after about 10000 km. If it is not replaced for too long, it will cause serious dust blockage, resulting in insufficient air intake and abnormal engine jitter. If such a situation occurs, replace the air filter with a new one.

three
Spark plug aging
The spark plug has a certain service life, and the ignition performance of the aging spark plug decreases due to the consumption of the motor. It will lead to difficult cold start and abnormal engine jitter.

four
Fuel injection nozzle is blocked
As there is gum in the fuel, the fuel injection nozzle will be blocked over time, which will lead to inconsistent injection quantity of each fuel injection nozzle, inconsistent operation of each cylinder, and abnormal engine jitter.

five
Carbon deposit and oil dirt blockage
After the throttle valve, idle valve and air inlet are used for a period of time, there will be carbon deposit and oil dirt blockage. Poor air intake will affect the unstable idle speed and cause jitter.

The above reasons are quite common. The cause of abnormal engine jitter still needs to be repaired in a professional repair shop to confirm the source of the fault.