What is the reason of Junpai a70 engine jitter?

The causes and solutions of vibration of Junpai A70 engine are divided into the following three parts: 1. The very common reason of vehicle vibration is that the throttle valve is too dirty and the nozzle has too much carbon deposit. If the engine has too much carbon, the gasoline sprayed by the cold start injection head will absorb a lot of carbon. Therefore, the accumulated carbon must be removed immediately. Second, the engine is short of cylinders. Engine cylinder shortage mainly means that more than one cylinder of the engine is not working normally. The phenomenon is that the automobile exhaust flow is obviously intermittent, while the exhaust pipe vibrates violently, and the engine vibrates obviously, sometimes accompanied by sudden noise. This is related to the failure of the ignition coil, and the relevant parts of the ignition system need to be replaced. Thirdly, the combustible mixture of the engine becomes lighter or thicker, causing idling vibration after cold start. The lower the temperature, the more oil is needed for cold start, and carbon deposition will affect the success of cold start. The front oxygen sensor needs to be replaced. Summary: If the engine vibrates, the vehicle should be inspected and maintained immediately, and the ignition system, air intake system and fuel system should be checked for faults. If there is any fault, it should be eliminated immediately.