What are the "small common problems" of BMW B48 engine

In previous installments, we've talked about the problems that caused the BMW B48's engine to leak and break down. In this issue, let's talk about a common problem of the BMW B48 in addition to water leakage. That is, the car will emit a continuous patter when it starts cold, generally this phenomenon is caused by the damage of the carbon tank solenoid valve.

While the noise itself is not alarming, its impact on the driving experience cannot be ignored. So, what is the working principle of the carbon tank solenoid valve? What is the cause of damage to the carbon tank solenoid valve? How to fix it?

The role of the carbon tank solenoid valve

Carbon tank solenoid valve is an important part of the engine gasoline evaporation control system, the main role is to control the flow of gasoline steam in the carbon tank, the gasoline steam in the tank into the engine combustion, so as to improve fuel efficiency, reduce fuel consumption, and reduce emissions, reduce environmental pollution.

Cause of damage of carbon tank solenoid valve

1.     Components are aging

Because the carbon tank solenoid valve is a rubber part, with the passage of time, the aging speed of the rubber part will be accelerated in the high temperature and oil pollution environment, resulting in a decline in sealing performance, slow response of the control valve, or even complete failure, affecting the normal operation of the engine.

2 .    Impurities are blocked

If the long-term use of poor quality or more impurities of fuel, these impurities or water in the fuel system will enter the carbon tank solenoid valve, causing the valve to jam, resulting in damage to the carbon tank solenoid valve.

3 .    The electromagnetic coil is faulty

After the electromagnetic coil works for a long time, the coil may be short-circuitated or disconnected due to high temperature or aging insulation materials, making the solenoid valve unable to open or close normally, resulting in damage to the carbon tank solenoid valve.

The phenomenon that the carbon tank solenoid valve is broken

1 .   Mixture anomaly

Because the carbon tank solenoid valve controls the flow of gasoline steam in the carbon tank, if the carbon tank solenoid valve is damaged, it may cause fuel steam to continue to enter the cylinder to participate in combustion, resulting in abnormal mixture ratio.

2 .   The engine trouble light came on

If the carbon tank solenoid valve is damaged, it will affect the performance and operation efficiency of the engine, and the engine failure light of the driving instrument will be lit in serious cases.

3 .   The idle speed is unstable

If the carbon tank solenoid valve is normally open, it may cause the mixture of the intake port to be in a concentrated state, resulting in too high idle speed; If the carbon tank solenoid valve is normally closed, it may cause the mixture to be too thin, resulting in too low idle speed.

4 .   The car makes an abnormal noise or stalls

If the carbon tank solenoid valve fails, it may make a patter sound when the car starts cold, resulting in a poor driving experience. In addition, the damage of the carbon tank solenoid valve may even cause start-up difficulties or accidental flameout, which seriously affects the safety of the vehicle.

NIBD carbon tank solenoid valve

Tips:

If you are the owner of a BMW B48 engine, if you encounter the above symptoms when driving, it is recommended to find a professional maintenance room for inspection and replacement of parts to ensure the normal operation of the vehicle and environmental standards, to avoid serious consequences. At the same time, regular cleaning and maintenance of the fuel system and the use of qualified fuel can effectively extend the service life of the carbon tank solenoid valve.