Why is it easy for Alto to stall when driving?

1. Carbon deposition in the valve and combustion chamber: determined by the control characteristics of the EFI engine, the cylinder is injected first and then ignited every time. When we put out the engine, the ignition device was cut off immediately. However, the gasoline sprayed by this working cycle cannot be recovered and can only be attached to the intake valve and the combustion chamber wall. Gasoline is volatile, but wax and gum in gasoline will remain. In the long run, the wax and gum in gasoline accumulate thicker and thicker, and harden after repeated heating.

2. Carbon deposition in the intake pipe: Due to the unsynchronized operation of the pistons of the whole engine, when the engine is turned off, the intake valves of some cylinders cannot be completely closed, and some unburned fuel is continuously evaporated and oxidized, which will produce some soft black carbon deposition in the intake pipe, especially behind the throttle. On the one hand, these carbon deposits will make the pipe wall of the intake pipe rough, and the intake will produce eddy currents in these rough places, which will affect the intake effect and the quality of the mixture. On the other hand, these carbon deposits will also block the idle passage, making the idle control device stuck or out of its adjustment range, resulting in low idle speed, idle jitter, failure of various auxiliary devices to increase speed, flameout of oil collection, excessive exhaust gas and excessive oil consumption.