China Naming Network - Ziwei knowledge - 14 VIOS, after replacing the back pressure drum at the tail section, the number of revolutions can reach 4000, and there is still jitter.

14 VIOS, after replacing the back pressure drum at the tail section, the number of revolutions can reach 4000, and there is still jitter.

1、

The throttle nozzle is too dirty and has too much carbon, which will shake the car. After driving for a certain mileage, the dirty throttle will cause the throttle to close loosely or the idle stepper motor to get stuck, both of which will lead to the engine idling too fast. The carbon deposit produced by the engine during the working process will also cause the car to shake, especially when starting the car, the engine shake will be more serious than normal, and sometimes even it will not be started at one time. When the vehicle shakes, check the throttle and nozzle first. If the throttle valve is found to be too dirty or the fuel injector has too much carbon deposit, it should be cleaned in time. 2, the aging of the engine pad will also cause jitter. Car jitter is sometimes related to the aging of engine feet. The engine foot is actually the damping system of the engine. The engine foot is responsible for absorbing slight vibration when the engine is running. If there is something wrong with the engine foot, these vibrations will be transmitted to the steering wheel and cab, causing idling jitter. 3. The causes of tire bulging include: due to frequent insufficient tire pressure, the steel wire inside the tire often breaks by itself due to excessive bending and stretching; The tire is not positioned correctly, and one side of the tire is often worn. In the long run, the tire surface will be wrapped after this part of the steel wire is worn and broken. 4. The reason why the tire is serrated: the quality of the tire itself is not good; Often driving in bad road conditions; After the shock absorber is aged, the tread and ground jump. Therefore, after the aging of automobile tires, car owners should replace new tires in time to avoid causing greater hidden dangers of accidents.