Why does Toyota Zhixuan shake after starting?

Vehicle jitter during cold start is a common problem of gasoline vehicles. The car shakes during cold start or idle speed because of poor combustion and insufficient power, so the car will shake. As mentioned above, the biggest possibility is that the throttle valve is too dirty, and there is too much carbon deposited in the nozzle and air intake. In the case of cold car, the carbon deposit will adsorb some fuel. If the fuel does not completely enter the cylinder for combustion, it will cause the symptoms of unstable idle speed and difficult start. It should be noted that when cleaning the throttle, you can't just clean the throttle. The throttle idle valve must be disassembled and cleaned, and the bearing of the idle valve must be lubricated. In addition, due to the long-term use and aging of spark plugs, the gap between the two poles is easy to widen and widen, resulting in insufficient ignition energy and gasoline atomization effect, and the car will shake. Now many cars are three-cylinder and four-cylinder cars, and each cylinder has a spark plug. These spark plugs also have the phenomenon that the gap becomes larger, which makes the power of each cylinder body different, leading to car jitter.