What happened to the shaking and flameout of the Audi q5 cold car?

The probable cause of shaking and flameout of Audi q5 cold car in Pacific Auto Network is carbon deposition, which generally appears in the inner wall of throttle valve, intake valve head, air intake, piston top and combustion chamber. Need to go to the 4s shop to find out the specific reasons and solve them as soon as possible, so as not to affect the use of vehicles.

The possible cause of the start-up jitter and flameout of Audi q5 cold car is carbon deposition, which usually appears in the inner wall of throttle valve, intake valve head, intake port, piston top and combustion chamber. It is recommended to go to the 4s shop to understand the specific reasons, so as not to affect the use of vehicles.

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 into the intake space 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 for a night or 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, and the mixture is thin and difficult to ignite. The motor is running, and 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, which will make the cold start more difficult. Even if it can be barely started, it will be closed soon. Moreover, with the increase of engine temperature, the fuel in the carbon deposit evaporates and is sucked into the cylinder to participate in combustion. This part of the fuel is out of control, resulting in too much mixture and poor engine work.