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Audi A4 Purge Valve

Signs Telling Your Audi A4 Purge Valve is Bad

Your Audi A4 purge valve is the part that releases fuel vapors from the charcoal canister into your engine so they can be recycled. This contributes to your car's fuel economy as well as clean emission. Your purge valve is easily affected by dirt and contaminants, causing it to get stuck on either the closed or opened position. When this happens, a lot of issues associated to fuel combustion would arise. That is why you need to know when you have to check this part. This would prevent the more serious engine problems that could result from neglect of a purge valve failure.

Damaged spark plugs

A noticeable symptom of a bad purge valve is damaged spark plugs. Since the valve is clogged or faulty, fuel vapors are not released into the cylinder of your engines. When this happens, fuel is not mixed with air properly. This results in a rich fuel mixture which burns and wears your spark plugs in the long run. When this happens, it is advisable to replace your spark plugs and your purge valve immediately.

Blown gaskets

When your purge valve refuses to release the fuel vapors inside the charcoal canister, the whole of your car's emission system is affected. Pressure increases inside the system, causing gaskets and seals to blow up. These rubber materials may be installed securely and tightly, but due to the high pressure, they are the first parts to give in. When these seals blow, oil sprays out from the emission system. This could lead to more engine problems if left unfixed.

Engine miss

When your engine misses out or runs rough, your Audi A4 purge valve may be failing. Because the part does not release the fuel vapors, they build up inside the charcoal canister. When this condition continues, excessive fuel vapors would be pushed back into the engine cylinders. This causes your engine to choke and miss. As a result, abnormal fuel combustion occurs wherein your engine seems to struggle.

Bad emission

If you just had your car emission-tested and failed, it may be caused by your clogged Audi A4 purge valve. When this happens, the fuel vapors from your charcoal canister are not recycled for combustion. These vapors are released by the exhaust system. As an effect, large amounts of carbon are emitted.

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  • How to Properly Care for Your Audi A4 Purge Valve 27 February 2013

    Your Audi A4 purge valve is easily affected by different factors such as dirt, leaks, and electrical problems. The slightest of these issues would cause the valve to get stuck in either the closed or opened position. When this happens, countless engine problems follow. To avoid such issues, you need to take good care of your purge valve. The part is located within your engine block, so taking care of it is not difficult at all. Following are some of the known ways of preventive maintenance on your purge valve:


    Clean your purge valve from time to time.


    Road dirt and dust can clog your purge valve and have it stuck in the opened or closed position. Either way, problems would arise from your fuel combustion. With this, it is recommended to clean the valve of dirt and dust from time to time. The task involves completely removing your purge valve from the engine block and disassembling it. The best product you can use is carb cleaner because it evaporates quickly.


    Check your charcoal canister regularly.


    Aside from outside contaminants, your purge valve may also get stuck because of the charcoal canister where it is attached to. Over time, the charcoal bits inside the canister travel to the valve, clogging it. With this, regularly check your charcoal canister and make sure no charcoal bit is escaping from it. Spraying carb cleaner on its opening where it is connected to your purge valve would also help clean it.


    Take care of your Audi A4 purge valve's electrical connections.


    Your purge valve is useless and would even cause problems if it does not close or open. The flow of fuel vapors is restricted by a flap on your purge valve. This flap is magnetically manipulated by the valve's electrical contacts and coils. You have to make sure these electrical components are clean and working well all the time. Use a voltmeter to check whether electricity is flowing smoothly through these parts.


    Mind your vacuum hoses.


    Your purge valve is also connected to vacuum hoses. Like regular hoses in your car, these pathways develop tears and cracks over time. More so, the connections on these hoses become loose. When these occur, vacuum leak follows. This leak ultimately damages your purge valve.