What is the reason why the speed of the car is unstable and easy to die when the car starts?

Unstable idling can be due to the following reasons:

1. The engine has serious carbon deposits.

When the carbon deposit inside the engine is too much, the gasoline sprayed out by the cold start fuel injection head will be absorbed by the carbon deposit in large quantities, resulting in the mixture of cold start being too thin, making it difficult to start, in this case, only when the gasoline absorbed by the carbon deposit is saturated, it is easy to get on the car, and the gasoline adsorbed on the carbon deposit after the car will be sucked into the cylinder by the vacuum suction of the engine for combustion, and the mixture becomes thick, and the combustible mixture of the engine is dilute and thick, causing idle shaking after cold start.

2. Excessive fouling of the throttle and inlet tract.

The excessive carbon and dirt deposits in the throttle valve and the surrounding air intake, and the change in the cross-sectional area of the air channel, make the control unit unable to accurately control the idle air intake, resulting in the mixture being too thick or too thin, and making the combustion abnormal.

3. The spark plug spark caused by individual spark plug failure is too weak.

Spark plugs can also build up carbon, which can be cleaned to restore spark plug activity, but some spark plugs are nearing the end of their useful life and their performance will be reduced. The spark plug spark on the individual cylinder is weak, which will affect the performance of the car, and the spark plug failure will cause the car to have the symptoms of "lack of fire", but the spark plug of the individual cylinder will have idle instability symptoms if there is a slight fault.

4. Fuel pressure failure.

If the oil pressure is too low, the atomization state of the fuel injected from the injector is poor or the fuel injected is linear, and only oil droplets are sprayed in serious cases, and the amount of fuel injected is reduced to make the mixture too thin; The oil pressure is too high, and the actual fuel injection volume increases, making the mixture too concentrated.

5. Failure of various parts.

Leakage of intake manifold or various valves, failure of fuel pressure, low oil pressure, failure of ignition system, etc., can also cause engine idling instability.

First of all, when starting to refuel, the clutch is loose and slow, otherwise this phenomenon will occur, if the other states of the vehicle are normal, I personally feel that it has a lot to do with the operation, change the driving habits, I hope to help you.

Is it normal maintenance in a regular place every year.

If you maintain it normally, you can tell you during the inspection.

For example, spark plugs, fuel injectors, throttle valves, and so on.

The cleaning of the change should be changed.

Also, do not use engine oil from unknown sources.

The main reasons for the general car stalling:

1. Use low-quality fuel. Once the automatic car stalls, the main reason is the use of inferior (not up to standard) fuel, which in turn causes the engine to depot and stall.

2. Engine computer failure. From the point of view of kilometers, after using the car for a long time, the possibility of engine computer failure will be relatively large, once the engine computer fails, it will cause the car to stall, which is a problem of control. Just like the human brain, when there is a malfunction, the body "goes out".

3. The driving skills are not proficient enough. The driver's unskilled driving skills and improper operation will also cause the car to stall.

4. Multiple cylinder failures at the same time. It is possible that due to the failure of the spark plug or the high-pressure bag, one or more cylinders will not ignite, resulting in a flameout. However, only the failure of multiple cylinders at the same time and non-ignition can cause flameout, so there is such a possibility, but the probability is not large.

5. The engine itself fails. Damage to the engine idle motor or the wiring of the idle motor, or a problem with the idle control module in the engine's electronic control unit (ECU). The possibility of the engine itself failing is extremely high among the many reasons why a car stalls.

6. Oil pump failure. The stuck oil pump or the failure of the oil pump itself will cause a sudden lack of oil supply, and no oil supply will easily cause the car to stall.

It's best to go to a repair shop to see if there is any charcoal.

Generally speaking, the main causes of car fire are:

1. When starting or reversing, the clutch is loose too fast, or the oil is insufficient;

2. When you start, you hung up the wrong gear, not in the first gear, or hung in the third gear;

3. Didn't let go of the brake when starting;

4. I didn't step on the clutch after braking suddenly. It should be to brake first and press the clutch before the engine turns off;

5. Mistakenly hung from the high-grade position into the resistance position;

6. When the engine power is insufficient, it suddenly hangs into about one gear from the resistance position, also known as "skipping the gear";

7. The half-slope start is not familiar enough, resulting in flameout;

The main hazards of dead fire are:

2. Cause wear and damage to gears;

3. Cause damage and excessive wear of belts;

4. Cause wear and tear of tires; In this regard, business experts reminded that in order to prevent the car from starting to catch fire, the main thing is that the clutch is loosened too quickly, and it must be given enough oil, slowly loosen the clutch, and then continue to loosen the clutch after feeling that the car has gained enough power. The same is true for mid-hill starts, make sure to feel that the car's momentum can overcome the force of the car's slide before releasing the handbrake so that it doesn't slip. After being proficient, you can do without the handbrake, when you release the foot brake and step on the accelerator, there will be a little slip, but soon the start will be fine, which is called the oil off the cooperation, is an important pass for the hand block car in the driving school practice.

If you're a beginner, you'll need to practice a little bit more.

Hello, common fault causes:1air leakage in the air intake system; 2.The fuel pressure is too low or the holding pressure is abnormal.

3.There is a large amount of air in the oil circuit, which causes air resistance. 4.

The return line or fuel filter element is clogged. 5.The air cleaner element is clogged.

6.Cooling temperature sensor malfunction. Sensor failure.

8.Failure of the idle control valve or additional air valve. 9.

The exhaust gas recirculation valve is not working well. 10.Poor injector work (oil leakage, carbon deposits, gum clogging, etc.).

11.Inaccurate ignition timing (worn-out timing pulley connection keys). 12.

Start switching the wiring of the computer. 13.The cylinder compression pressure is too low.

14.Excessive carbon build-up in the intake duct and intake and exhaust valves (loose valve closing). 15.

Ignition coils, spark plugs work poorly, or high-voltage wires are damaged, etc. 16.The cold-start injector does not work.

Generally, like the battery voltage deviation point, carbon deposit, oil pressure bottom spark plug will cause the cold car to start badly, like you introduced, you can check the carbon deposit of the throttle first. Hope it helps.

The conventional reasons are spark plug aging, dirty throttle, low engine idle speed, more engine carbon deposits, etc., here is not very sure what specific cause causes idle stalling, it is recommended to check it.

Your car has difficulty starting in the morning. It's time to change the gearbox oil. After changing the oil, it is easy to start.