What are the symptoms of a broken BMW canister solenoid valve? Where is the BMW canister solenoid valve and how much does it cost?

What are the symptoms of a broken BMW carbon canister solenoid valve? It is estimated that some car repair enthusiasts have encountered problems with the carbon canister solenoid valve and want to know what symptoms they will have if this thing is broken. Let’s briefly talk about it. First, let’s understand what the carbon canister solenoid valve does? How does it work? We know that gasoline is volatile, so the fuel tank must have a ventilation system, otherwise it will burst sooner or later. In early cars, the fuel tank cap was made into a pressure limiting valve. As long as the pressure in the fuel tank reached a set threshold, the pressure limiting valve would open and the fuel tank would be directly ventilated to the atmosphere. This solved the pressure problem, but it was wasteful. And cause pollution to the environment. Therefore, there was the later carbon canister. One end of the carbon canister is connected to the fuel tank, and the other end is connected to the engine intake manifold through the carbon canister solenoid valve. The interior is filled with granular activated carbon. When oil and gas pass through the carbon canister, the fuel molecules in it will be adsorbed by the activated carbon, and the air will pass through the carbon canister. External atmosphere. When the engine is started, the carbon canister solenoid valve is controlled by the DME to open or close according to the engine load. Once opened, the gasoline particles adsorbed in the carbon canister will enter the cylinder under the action of the intake manifold vacuum to participate in combustion. Therefore, there are two situations when the carbon canister solenoid valve is broken: 1. The carbon canister solenoid valve is always open and will not close. We can imagine that if the carbon canister solenoid valve is always open, then the fuel tank and the intake manifold are not indirectly connected. , originally it was kept closed when the car was turned off, but now it is always open. After the activated carbon in the canister is saturated to absorb fuel particles, it will directly go to the intake manifold, so a cold start after a long parking period may cause The mixture is too rich, resulting in unstable idling, difficulty in starting, or even failure to start. Even if it is started, various symptoms of an overly rich mixture may appear during subsequent driving, such as increased fuel consumption, weak acceleration, and the smell of gasoline in the car. 2. The solenoid valve of the carbon canister is normally closed and will not be opened. If the solenoid valve of the carbon canister remains closed, the canister will continue to collect fuel particles. Once the activated carbon is saturated, fuel vapor or oil dripping will appear at the atmospheric outlet of the canister. Disassemble it. Open the carbon canister and it will be filled with fuel. In addition, if the solenoid valve is closed, it will most directly cause the pressure in the fuel tank to be too high, which may cause the gun to jump when refueling. Opening the fuel tank cap may also cause gas to spray out. Tips: Share two simple methods to determine whether the carbon canister solenoid valve is damaged: 1. Unplug the carbon canister solenoid valve. If you can still feel the suction phenomenon, it means it is normally open. 2. Unplug the pipe of the oil tank. If there is no suction phenomenon at the interface of the carbon canister, it means that it is normally closed. Where is the BMW carbon canister solenoid valve? 1. The carbon canister solenoid valve of this car is located near the intake pipe. There is a long black box, which can be found nearby. 2. Under the air intake pipe, you can find it by going down here. 3. For older, inline 6-cylinder engines, if you want to replace them, you can find a hard pipe in the intake pipe and look inside. If it doesn't work, raise the car. How much does a BMW carbon canister solenoid valve cost? Answer: ranging from 350 yuan to 1,500 yuan. The above are the symptoms of a broken BMW canister solenoid valve. Where is the BMW canister solenoid valve and how much does it cost? Content introduction, if you want to know more relevant information, please log in to www.diancifa.cc to view the Dianwei Pneumatic.