The Evaporative Emission Control System (EVAP) in cars prevents harmful vapours from escaping into the air from the fuel system. The fuel tank vents lines and sends the vapours to the EVAP storage canister, where they are trapped and stored until the engine starts. Hence, the EVAP canister is one of the key components of this system and you must know the signs of a bad evaporative emission control canister.
Evaporative Emission Control Canister Location
The EVAP has been used in all cars and trucks since the early 1970s. The evaporative emission control canister is a small container mounted inside a panel or in the corner of the engine bay. The small canister is filled with activated charcoal that absorbs harmful fuel vapours. These vapours keep stored in the canister until the engine is hot.
Signs of a Bad Evaporative Emission Control Canister
Here are some symptoms of a bad evaporative emission system that can help you in identifying the problem on time.
Check Engine Light is On
The EVAP canister is controlled by the car’s computer which helps in monitoring the performance of the canister valve. In case your car’s computer detects higher or lower purging from the valve, it will automatically turn on the check engine light. The common error codes you may get include P0441 and P0446. Your dashboard warning lights will then notify you that something is wrong.
The error occurs because the EVAP is a closed system that needs specific pressure. However, in case there is a leakage in the system or if it is clogged you will notice the check engine lights turned on.
Poor Fuel Mileage
Poor mileage indicates that there is a high consumption or a gas leakage in the system. Out of several factors, poor gas mileage can be one of the reasons for a lousy EVAP canister. In this case, the fuel vapours that your vehicle uses during combustion burnt before going to the combustion chamber. Hence, your vehicle will have low gas mileage. However, the issue can be fixed by changing the EVAP canister.
Poor Engine Performance
Besides low gas mileage, poor engine performance is also one of the symptoms of a bad EVAP canister. This happens due to the incomplete combustion process that is generated due to the failure of the EVAP canister. In case of bad EVAP system components, your vehicle will have a sluggish movement even after applying pressure on the pedal.
Rough Idling
A rough idle vehicle is one of the prominent signs of a damaged EVAP canister. In such a scenario, the vehicle won’t be able to maintain the RMP count over the high speed. Hence, you may feel a shaky vehicle while driving. The normal RMP of a stable vehicle is about 1000.
Besides bad evaporative emission systems, faulty spark plugs, vacuum leaks and dirty fuel injectors may also be the reason for rough idling.
Difficulty in Starting Up the Engine
Check if the evaporative emission system leak in case you are having difficulty starting up your car’s engine. This usually happens when the car’s vacuum leak is caused due to a bad charcoal canister. The vacuum leak allows unmetered air into the engine that ultimately disturbs the air-fuel ratio. The disturbance can lead to improper combustion because of having more air in the engine.
The issue in Filling up the Tank
The fuel fumes pass through the charcoal canister; however, the fumes won’t pass in case the canister is clogged. This condition creates high pressure in the fuel tank which is why the air won’t be able to flow out while filling the fuel. In this case, the fuel hose nozzle shuts off before your tank is full.
Besides, a faulty EVAP canister also vase petrol smell in a car due to a cracked charcoal canister or shorted valve circuit.
Now you know the symptoms of a bad charcoal canister. Hence, those who are willing to reduce their car’s carbon footprints must maintain their vehicle, especially the EVAP system. Besides, you can also switch to an electric car in the UAE. The cars not only helps in minimising the emission of carbon monoxide but you can also enjoy other pros of owning an electric car in Dubai.
Therefore, if you are interested in buying an electric car or other used car for sale in the UAE, check out the listings.
With this, we conclude our guide here. Stay tuned to the UAE’s leading auto blog to know more about repair and replacement tips.
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