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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. Then, what is the problem of body jitter? How can the owner of the car judge and solve it? When running, it is found that the body jitter occurs if the car is slightly jitter or offset during the driving process, usually caused by a tire 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. The body jitter of idling body at idle speed is often encountered by many owners. 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: 1. the most common cause of the car jitter caused by the carbon deposition of the engine 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. Solution: clean the oil circuit and check whether the idle motor has carbon deposition and should be cleaned. 2. ignition system problems check the working conditions of spark plug, high voltage wire and ignition coil, the ignition system is bad, and the poor spark plug can cause such failure. Solution: check whether the spark plug is too much carbon and replace spark plugs. 3. oil pressure instability, if it has cleaned up the engine carbon, the throttle valve, the replacement oil pad and the spark plug, still finds the idling body jitter. It is suggested that you check the oil supply pressure and the intake pressure sensor to check if the oil pump pressure is abnormal or the intake pressure sensor number in the 4S store. Wrong values and poor work cause body jitter. Solution: check the oil pressure and replace parts when necessary. 4, engine parts aging 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.