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Product Description
The carbon canister is actually a part of the gasoline evaporation control system (EVAP), which was introduced to prevent fuel vapor from escaping into the atmosphere after the engine stopped running. Since 1995, it has been stipulated in our country that all new cars must have this system.
Next, let's take a look at which faults are related to the carbon canister and what details the owners should pay attention to to to reduce the faults caused by the evaporation control system:
1. Abnormal sound when the vehicle is driving
When the engine is not idling, you can hear the sound of "da da" from time to time. Don't panic in this situation. The first thing to do is to find the solenoid valve of the carbon canister on the car and judge whether the "da da" sound is made by it. If it is, don't pay attention to it. Because the carbon canister solenoid valve will produce intermittent switching action when the throttle is opened, thus making a sound, which is a normal phenomenon.
2, step on the accelerator, the car has a strong oil smell.
If you encounter a fault that the car is blocked when you step on the accelerator and the gasoline smell in the car is relatively strong, you should pay special attention to whether the pipeline in the carbon tank system is damaged. Gasoline vapor will be directly discharged into the atmosphere along the damaged part, resulting in a strong smell of gasoline in the car. However, if the pipeline leaks oil at this time, it will cause air to enter the intake port of the engine instead of fuel vapor, which will inevitably cause the engine mixture to be too thin, thus leading to the phenomenon of untimely jamming.
3, the engine idle speed is high and low and the acceleration is weak.
If, after the engine is started, the rotational speed rises and falls regularly at idle speed and the car is unable to accelerate, it is necessary to pay attention to whether it is caused by the blockage of the air inlet and filter screen of the carbon canister. Because at this time, the outside air is not easy to enter the carbon canister, and there is a lack of fresh air in the canister. When idling, the gasoline vapor adsorbed in the activated carbon canister is sucked into the intake manifold under the action of intake vacuum suction, so that the oxygen sensor detects that the mixture is too rich, so the engine control unit reduces the amount of fuel injectors, and the concentration of combustible mixture decreases at this time, resulting in low idling speed; Subsequently, due to the decrease of fuel injection, the oxygen sensor detected that the mixture was too thin in the next cycle, so the computer increased the fuel injection, which led to the increase of idle speed, so the phenomenon that the speed of idle speed regularly fluctuated. Therefore, when this happens, the car mainly checks whether the air inlet of the carbon tank is unblocked in time.
4, the engine flameout or not easy to start
At this time, pay attention to check the solenoid valve of the carbon canister that may cause the problem. If the solenoid valve is always closed, the gasoline vapor in the carbon canister will accumulate more and more, eventually filling the whole carbon canister, and the rest of the gasoline vapor can only escape into the atmosphere, polluting the environment and wasting fuel. On the other hand, if the solenoid valve is always in the open state, the mixture in the intake port of the engine is always in the enriched state, and at the same time, the control unit of the engine will not issue an instruction to reduce the fuel injection quantity because it has not controlled the solenoid valve of the carbon canister to work at this time, which will cause the engine to stall when the mixture is too rich during the hot car, and it is not easy to start after the hot car stalls.
5. Refueling should not be too full or too fast.
The second point that car owners should pay attention to is not to overfill every time they refuel, and remember to be slow when adding it to the near full. Overfilling is easy to cause the pipeline in the activated carbon tank system to enter the gasoline. These liquid fuels not only do harm to the carbon tank itself, but also flow into the air intake along the pipeline, causing the spark plug to "drown", resulting in the serious consequences of the car stalling until it can't be started. If you refuel too fast, if the expanding steam and the gas from the gasoline are too late to be released, it will produce choking oil.
