What should I do if the BMW 7 Series cold car starts to shake and stall?

The reason for carbon deposition is that the BMW 7 Series cold car started shaking and flameout. Carbon deposition usually occurs in the inner wall of throttle, intake head, air intake, piston top and combustion chamber. Too much carbon deposition on the inner wall of solar terms will lead to insufficient air intake, which will lead to difficulties in starting or idling.

When the water temperature reaches the normal working temperature of the engine, the computer repeatedly adjusts the position of the throttle valve plate because the throttle valve is too wide and exceeds the normal idle speed value, and the idle speed rises and falls. In fact, it is not only the throttle valve that is the easiest to deposit carbon, but also the head of the intake valve (the end of the intake port). The gasoline injection of indirect injection engine is injected between the intake air where the intake valve head is located, and gum, wax and unburned carbon compounds are deposited in this part. The surface of carbon deposit is loose and porous. After stopping overnight or for a long time, when the cold car is started, most of the fuel injected by the injector is absorbed by carbon deposits. The amount of fuel entering the cylinder is insufficient, so it is difficult to ignite the lean mixture. With the operation of the motor, the fuel entering the cylinder is enough to ignite after multiple injections. In this case, it will definitely be difficult to start. What's more, if there is too much carbon in the head of the intake valve, the valve will not be closed tightly, and it will be more difficult to start the cold machine. Even if it can barely be started, it will be closed soon. Moreover, with the increase of engine temperature, the absorbed fuel evaporates in the form of carbon deposit and is sucked into the cylinder to participate in combustion. This part of the fuel is out of control, resulting in too rich mixture and poor engine operation.

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