Gac fiat Fei Xiang: What is the reason for the jitter when starting and braking?

The throttle valve is too dirty, and the fuel injector has too much carbon deposit. After a certain mileage, a dirty throttle will cause the throttle to close loosely or the idle stepper motor to get stuck, both of which will lead to high engine idle speed. The carbon deposit produced by the engine during the working process will also cause vehicle jitter, especially when starting the vehicle, the engine jitter will be more serious than normal, and it may even not be started at one time. Therefore, when the vehicle is shaking, first check the throttle and throttle. 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.

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Engine pad aging, car jitter is sometimes related to engine pad aging. The engine foot is actually the shock absorption system of the engine, and the engine foot is responsible for absorbing the slight jitter 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. When the automobile engine is idling, turning on the automobile electrical system is most likely to cause the vehicle to shake. The engine will increase the load due to turning on the electrical system, resulting in idling and slipping. In order to compensate for the jitter caused by idle speed, the engine will automatically raise the speed. Therefore, when the automobile electrical system is turned on, especially when the automobile air conditioner is started in summer, the engine often shakes. If the jitter in idle state will not be reduced due to the operation of the compressor of the car air conditioner, then this jitter is probably caused by the aging of the engine foot, and it is necessary to replace the engine foot in time. Uneven tire weight is also one of the reasons for the jitter. Generally, wheel balance should be done when replacing new tires and rims, otherwise the steering wheel will shake easily when the counterweight is uneven. If it is found that the tire balance blocks are uneven, lead blocks need to be added inside the steel ring to make the tire balance blocks on both sides evenly balanced. Whether it is a general steel ring or a light aluminum ring, it may be deformed or broken when subjected to a certain external force. Rim deformation, uneven rim weight and incorrect rim angle will all cause jitter when driving.

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The tire aging and deformation, as well as the vibration of the elevator during driving, are far more worrying to the driver than the vibration at idle speed. Vehicle vibration is mostly related to the transmission system, and the most basic part is the tire problem. If the owner suspects that the tire is causing the vehicle to shake when driving, the easiest way is to touch the tire tread carefully with your hands. If the tire tread is serrated, it means that the tire has aged and deformed. In addition, the broken steel wire inside the tire makes the rubber part of the tire unable to get effective and uniform traction, which leads to the bulging of the tire tread, and also causes the vehicle to shake, and the tire puncture problem may occur at any time. 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. The reasons for the sawtooth of the tire are: 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. In addition, if the owner is used to braking suddenly when driving at ordinary times, the brake disc will be uneven, which will make the brake disc stress uneven, and

When braking, the vehicle will shake.