307 cleaning throttle valve

When driving at low speed for a long time, there is carbon deposit on the accelerator, which will adsorb gasoline when starting, resulting in low oil and gas concentration and low speed; After a period of time, due to the temperature rise, the adsorbed gasoline will be released, and the oil and gas concentration is too high, resulting in high speed. Observing the tachometer when starting, it is obvious that the speed is unstable.

There are many reasons for carbon deposition, mainly low-speed driving and inferior gasoline. This has nothing to do with the car itself, not with the quality. The practice of customer service MM is to eliminate some carbon deposits with high temperature and fast airflow, but this practice can only remove a little. If you often run at high speed, you won't accumulate too much carbon. If there are no conditions, buying some fuel additives will also have a little effect. Disassembly and washing are the last resort. Why do you want to dismantle a good new car?