New car has been used for some time, some owners will find some small jitter, but do not know what is wrong. "Body jitter" is a signal that tells the owner of the car that something has gone wrong. Professional Master Yu told us that the body jitter seems trivial. If you do not pay attention to the test, it will cause big trouble. So, what is the cause of the body jitter? How can the owner of the car judge and solve it? If there is a slight jitter or offset in the car, it is generally a tire - caused failure. First of all, it may be that the balance of the tire is not good, and the owner needs to do a four wheel positioning and dynamic balance as soon as possible, if the vehicle does not run on the balance of the tire. The other situation is more serious, probably due to the deformation of the steel ring, which requires the owner to check the professional repair shop. This situation usually occurs in vehicles with long service life. In general, a tire balance should be made when new tyres and new steel rings are replaced. Otherwise, the steering wheel will easily shake when the weight is uneven. Body jitter has an impact on driving comfort and handling judgment. The third case is due to the unbalanced deformation of the transmission shaft, which usually occurs when the chassis has collided with the vehicle. Idle body jitter is a common problem many owners often encounter. If the car owner is starting the vehicle or stopping the engine without turning off the engine, if the body jitter is found obvious, then it may mean that there are three conditions in the vehicle: the most common cause of the jitter is that the throttle is too dirty or the fuel nozzle is overaccumulated. When the carbon accumulation in the engine is too high, the gasoline that is sprayed by the cold start nozzle will be absorbed in a large amount of carbon, causing the cold start of the mixture to be too thin, making it difficult to start. In this condition, only when the carbon absorption of gasoline is saturated, it is easy to take the car, and the gasoline adsorbed on the carbon after the car will be vacuum in the vacuum of the engine. Suction suction cylinder combustion, and make the mixture thickened, the engine's flammable mixture is thin and dense, resulting in idle start after cold start. The lower the temperature, the greater the amount of oil needed for cold start. The existence of carbon deposition will affect the success of cold start. Clean the oil circuit and check whether the idle motor has carbon deposition. Check the working condition of the spark plug, high pressure wire and ignition coil, the ignition system is bad, and the poor spark plug can cause this kind of failure. Check if the spark plug is too much carbon and replace spark plugs. If the engine has cleaned up the engine carbon, the throttle valve, the replacement oil pad and the spark plug, the body jitter is still found at the idle speed. It is suggested that you go to the 4S store to check the fuel oil supply pressure and the intake pressure sensor, if the oil pump supply pressure is abnormal or the intake pressure sensor. Numerical errors and poor work results in body jitter. Check oil pressure and replace parts if necessary. Car jitter is also related to engine aging. The engine foot is the engine's shock system, the engine foot is responsible for absorbing the slight jitter of the engine during the operation. If the engine foot problems, the vibration will pass to the steering wheel and the cab, causing the jitter of the idle speed.