Why is the engine of song plusdmi shaking?

Song plusdmi engine jitter clearly shows that the vehicle has the following four conditions: first, the engine has serious carbon deposition; Second, there is a problem with the ignition system; Third, the oil pressure is unstable; Fourth, engine parts are aging. The most common causes of vehicle jitter are dirty throttle or excessive carbon deposition in fuel injectors. When there is too much carbon deposit in the engine, the gasoline injected by the cold start injector will be absorbed by the carbon deposit, which will lead to too thin cold start mixture and difficult starting. In this case, it is not easy to start the car before the gasoline absorbed by carbon deposits reaches saturation. At this time, the car mainly cleans the oil circuit and checks whether there is carbon deposit in the idle motor. Secondly, if the car idling jitter is not caused by engine carbon deposition, check the working conditions of spark plugs, high-voltage lines and ignition coils. Poor ignition system and poor spark plug misfire can also lead to this failure phenomenon. When it is determined that the ignition system causes idling jitter, the spark plug must be checked for excessive carbon deposition and replaced. If the engine carbon deposit is cleaned, the throttle valve is cleaned, the oil pad and spark plug are replaced, and the body is still shaking when idling, it is recommended to continue to check whether the fuel supply pressure and intake pressure sensors are normal. If the oil supply pressure of the oil pump is abnormal, or the value of the intake pressure sensor is wrong, or it does not work well, the body will shake. Check the oil pressure and replace parts if necessary. In addition to the idling jitter caused by the above reasons, automobile jitter is also related to the aging of engine feet. The engine foot is actually the damping system of the engine. Engine feet are responsible for absorbing slight vibration during engine operation. If there is something wrong with the engine foot, these vibrations will be transmitted to the steering wheel and cab, resulting in vibration at idle speed.