What is the reason why the car will turn off when it is idling unsteadily after starting?

First, the throttle valve and air flow meter have too much carbon deposit.

Throttle and air flow meter are easy to get dirty. Nowadays, most cars are electronic throttles, and a little carbon deposition may affect them. Excessive carbon deposition in the throttle will cause serious power drop and unstable idle speed.

Dirty air flow meter leads to wrong air flow signal, and the intake determines the fuel injection quantity, which directly leads to inaccurate fuel injection, which not only increases fuel consumption, but also seriously lacks power. Therefore, it is very important to replace the air filter, and it is best to clean it every 30,000 kilometers.

Second, there is too much carbon deposit in the cylinder combustion chamber and piston.

Too much carbon deposited in the combustion chamber of the cylinder will have a certain adsorption effect on gasoline. So the time will be extended when the ignition starts. Most of the carbon deposits will form on the valves and piston rings, which indirectly causes insufficient cylinder pressure. Cold car starts easily, idle speed is unstable, and hot car starts.

Automatic start flameout reason:

1, regarding gear shifting, novices like to use force when shifting gears, which is wrong. Normally, it is lightly hung on the corresponding gear according to the trajectory. And don't start in second gear, remember that the gear allocation of each car is different, and you need to hang it according to the instructions of the gear lever.

2. Novices often forget to release the brakes, which is one of the main reasons for flameout. Adjust the seat when you get on the bus, and your thighs and calves can flex freely. This is crucial. You can't drive well if you don't sit well.

3, step on the clutch, the left foot should step on the clutch to the end, otherwise the gear will have a toothed sound, otherwise it will not mesh, which will easily cause damage to the gearbox gear.

4. Novice refueling door is also an important reason for slow start and flameout. Traditionally, many novices have the habit of starting without refueling. When the car starts to refuel, the clutch and the refueling door should be released at the same time. Beginners start because the clutch is not loose to the linkage point or too slow, and the throttle boom is very big. When the car is running, the clutch should be released at a constant speed.

5. Because the clutch linkage point of each car is different, when driving for the first time, you should slowly lift the clutch, then find the linkage point, remember whether the linkage point is high or low, and it is the linkage point when the loose clutch car shakes slightly. After mastering the linkage point of the car, the left foot should be quickly lifted to the linkage point when starting.