Excuse me, what is the cause of the failure of Mercedes-Benz s350L, which causes the mixture in the right bank cylinder to become thinner and adaptively lower than the allowable limit when ignored?

1, this failure is caused by two reasons, one is air leakage, and the other is air flowmeter damage.

2. Treatment method: Check the adaptive value. If it is lower than the lower limit, test for air leakage first. The method can be plugging or spraying. If there is no leakage, the air flow meter is damaged.

3. The air flowmeter needs to be replaced. If it leaks, repair the leaking part.

4. Idle state refers to the working state when the engine is idling. When the engine is running, if the accelerator pedal is completely released, the engine will be at idle speed.

5. When adjusting the idle speed, the speed should not suddenly increase or decrease, otherwise it will cause early wear and tear to the engine. It's best to transfer to the automobile maintenance department.

6. Idle speed refers to the idling of the engine, which only needs to overcome the friction resistance of its internal parts and does not output power to the outside.

7. The lowest speed to maintain the stable operation of the engine is called idle speed, which is one of the five basic working conditions of the engine.

8. For engines with good working performance, the idle speed is generally 550-800 rpm.

9. The idle speed can be adjusted by adjusting the throttle opening and idling oil supply.

10. Generally speaking, the minimum idle speed is the best when the engine does not shake in the idle speed range and the acceleration performance is good.

Extended data

Causes of unstable idle speed of automobile

1. Observe the shaking degree of engine cylinder block, and also observe the shaking degree of dipstick handle. The smooth dipstick handle is very clear, and the swaying dipstick handle looks double.

2. Observe or read the data block from the engine tachometer, and the speed fluctuates around the expected idle speed.

3. Shake violently on the expected side. The expected idle speed in the program includes standard idle speed value, load idle speed value, air conditioning idle speed value and warm car idle speed value.

4. Start the engine in situ, and sit in the seat and feel the body shaking violently.

5. According to the occurrence law, the cold car (the coolant temperature is lower than 50℃) is rhythmically unstable.

6, hot car (coolant temperature higher than 50℃) rhythm instability.

7. Irregular violent shaking once or twice.

8. According to the degree of jitter, it is normal, and it is expected that there will be jitter at the idle speed of 10r/min.

9. Generally, it is unstable, and the expected idle speed is ±20r/min jitter.

10, seriously unstable, and the jitter exceeds the expected idle speed by 20r/min.

1 1, the expected side of idle speed violently shakes.

12, classified by reason association, the direct cause refers to the dirty, worn and incorrect installation of mechanical parts, which leads to the power change of a single cylinder, the power imbalance of each cylinder and the unstable idle speed of the engine.

13, indirect cause, refers to the abnormal electronic control system of the engine, which leads to poor combustion of mixed gas, making it difficult to balance the power of each cylinder and making the engine idling unstable.

References:

Baidu encyclopedia-idle speed?