Audi EGR Valve
There is something special about your Audi, way beyond its parts which easily drags your due attention towards it. If your Audi has failed to pass the emission test due to excessive emission coming out from the tailpipe, and you may realize a pinging noise coming out of the engine then it's probably your Audi EGR Valve which is creating all such menace.
Definition of an Audi EGR Valve
The Audi EGR valve is a vital control component of an engine's emission system as well as ignition system. The Audi EGR valve route a specific amount of exhaust back into the combustion chamber through the intake manifold where it can be used again and again.
Reprocessing of exhaust is done for two main reasons: to maintain an optimal temperature required for working of combustion chamber and to check the NOx emission along with other hazardous particles.
How does EGR valve reduce the NOx formation?
The flue gases are much cool than that of the intake air, that is why they chill down the combustion process much faster and easier, which results in a reduced NOx emission level.
Significance of an Audi EGR Valve
These days almost all Audi EGR valve is attuned for every engine model like that of Audi 100, Audi 5000, Audi A6, Audi Coupe, Audi Fox, Audi Q7, Audi Quattro, Audi RS6…… and all other models of Audi. Basically, Audi EGR valve is a reduction technique which upholds the proper fuel-air mixture, air pressure and exhaust pressure in every Audi unit in which they are fitted.
Symptoms of a faulty Audi EGR Valve
No matter whether your vacuum controlled valve is open/ close it will affect your Audi EGR valve in either way. In case it is left open it will lead to vacuum leak, inept combustion, rough idling, hesitation, and at times stalling. If it is stuck closed there will be rise in NOx emission and your Audi may start knocking.
- When your Audi is motionless or at rest you may feel that your Audi's engine is roughly idling. Further you may confirm this doubt by looking at tachometer, if while idling you may see any distortion in it then one can conclude that your EGR valve needs an immediate replacement.
- A rough idling will go along with stalling of your Audi even when they are not moving. Generally it point out to the onset of a bad Audi EGR valve.
- Instead of a smooth acceleration, while stepping on the gas pedal if you are facing any interruption then it's more likely your faulty Audi EGR valve.
- If any one or more of the above mentioned symptoms are further carried by a mild banging or beating sound from the engine even when the car is at rest, it is simply indicating you a bad EGR valve.
Precautions to be taken
- While you are seeking to replace your Audi EGR valve you should choose carefully and must be ensured about their specifications like Audi year and Audi model.
- Nonstop cruising with a damaged or decayed EGR valve may badly affect your fuel economy due to rise in the emission level.