What is the reason for the car shaking when Willard started after changing the gearbox?

The most common cause of automobile jitter is that the throttle valve is too dirty or the fuel injector has too much carbon deposit. When there is too much carbon deposit in the engine, the gasoline sprayed by the fuel injection head will be absorbed by the carbon deposit during cold start, which leads to the lean mixture during cold start and makes it difficult to start. In this case, only when the gasoline adsorbed by carbon deposits is saturated, it is easy to run into the car. After running into the car, the gasoline adsorbed on carbon deposits will be sucked into the cylinder by the vacuum suction of the engine for combustion, which will thicken the mixture and dilute the combustible mixture of the engine, resulting in idling jitter after cold start. The lower the temperature, the more oil is needed for cold start, and the existence of carbon deposit will affect the smooth start.

It is inevitable that the engine will produce carbon deposit, but when the engine has too much carbon deposit, it will lead to poor engine work and different faults. When there is too much carbon deposit in the engine, the gasoline sprayed by the fuel injection head will be absorbed by the carbon deposit during the cold start, which leads to the lean mixture during the cold start and makes it difficult to start. It is not easy to enter the car before the gasoline absorbed by carbon deposits reaches saturation. After entering the car, the gasoline adsorbed on the carbon deposit will be sucked into the cylinder by the vacuum suction of the engine for combustion, which will make the mixture rich, and the combustible mixture of the engine will be diluted and concentrated, resulting in idling jitter after cold start. Solution: clean the oil circuit, check whether there is carbon deposit in the idle motor, and clean it.

Or for a period of time, drive at a low speed and increase the engine speed. The purpose of this is to increase the intake air and gasoline flow of the engine and help remove the carbon deposit from the nozzle.