mechamanz

26 minutes ago, RoyC said:

Could it be a blow from the exhaust ?

I dont think so, the sound I am describing is when the vehicle is idling there is that deeper whirring sound, almost like a diesel. It could be absolutely nothing and I am just overthinking

1 hour ago, Magnet said:

Hello Abu,

Apologies, but you are just re-asking the question I have just answered! 
It could be me, but to repeat - do you really think that Audi would market a knocking/tapping engined new car? 
Is there any chance you have already fallen in love with this car, and are hoping someone will come along and confirm a knocking/tapping car is fine to buy, and you can go along with what you want to do? 
Apologies and kind regards,

Gareth.

Nope, the car is for my sister, I have been on the search slowly over the past few weeks and in no rush to buy.

My point is - I am not too familiar with these engines, and usually there are a whole load of different sounds in an engine bay, most of which are perfectly fine and normal. What I am subjectively describing as a 'knock' or 'tap', could in fact be normal running of the engine. Have you at least watched the video to witness the sound - to judge whether there is in fact a knock sound that doesn't sound right?

4 hours ago, Magnet said:

Hello Abu,

Thanks for joining and posting your plea.

The only question you need to ask yourself is whether Audi would have manufactured a car that would have had a knocking/tapping noise when new -? 
The answer to that should firmly direct you to just walk away. 
Kind regards,

Gareth.

p.s. I haven’t listened to the noise.

Thanks for the feedback and I see your point. If I was to re-phrase my question, it is more to understand whether the sound which I am describing as 'knocking/tapping' is in fact the standard sound from factory (and is applicable across all audi a3s) or if it something which isn't normal and therefore I steer clear

Hi,

Looking to purchase an audi a3, went to view it today and noticed a knocking/tapping sound in the engine bay, when idling, see video: 

Is this normal or could there be some sort of issue? My sister has a seat leon with the exact same engine but doesnt have this knocking sound when idling...

Thanks