How to deal with the problem of air not being completely discharged in the b12 engine?
2 Answers
Open the front hood, and there is a black exhaust pipe near the jack. Simply pull it out to discharge the air. Below are the specific details: 1. Cause: The engine's exhaust is not smooth. Symptom one: The idle speed of the car engine is significantly lower than the normal value and fluctuates between the lower limit of the rated idle speed. There is poor acceleration, jerking under heavy load, and relatively stable operation at medium speed. 2. Fault analysis: The idle speed is quite severe, there is insufficient power under heavy load, and the operation is relatively stable at medium speed. The EGR valve does not close tightly. When the car engine's water temperature is above 50℃ and the speed is between 1500～4500r/min, the EGR valve will be in the open state. At medium speed, the EGR valve itself will be in the open state, so the EGR valve not closing tightly does not affect driving at medium speed. Fault resolution: The EGR valve is closed, and the backflow of exhaust gas causes carbon deposits, leading to an uneven lower seat. After cleaning with carburetor cleaner, the fault can be eliminated.
I remember dealing with a similar issue before, where a friend's car had difficulty starting due to air trapped in the fuel system preventing ignition. First, check the fuel line seals, especially around the filter connections—any leaks can allow air to enter. Then, manually bleed the system: loosen the air bleed screw on the fuel pump or injector, gently turn the bleed port with a wrench, and keep pumping fuel until only clean fuel flows out without bubbles. Keep your hands steady during the process to avoid spills, and use a towel for protection. If manual bleeding doesn’t work, the filter might be old or improperly installed—try replacing it. To prevent such issues, avoid running the tank empty and regularly maintain fuel line connections. If this happens, don’t force-start the engine to avoid part damage; having an assistant makes the process safer.
