http://www.youtube.com/watch?v=btW9CjcaT6g

2011 A4 with CVT. 1400miles

From a cold start (74 degrees in garage) I'm hearing this odd lower pitched woosh noise when I'm backing up. Almost like the car taking in a huge swallow of air.... It goes away within 20 seconds.

I parked so that tonight I can see if I hear the noise driving forward from a cold start.

Any ideas?

 

I know mine, for sure, does not make that kind of sound in reverse. Might wanna just have it looked at for a peace of mind.

 

Only when you hit the gas?

 

Funny, on another Audi forum they immediately recognized it. Apparently all the B8's have it to some degree. It's a secondary air pump that only operates when the engine is cold. As soon as RPM's fall below 1000 in idle it goes away.

I'll mention it when I go in for my 1st 5000 check up regardless.

 

Ranchos - my new '11 A4 makes exactly the same noise as in your YouTube clip. I've been looking on different forums and the SAI pumps sometimes make more of a high pitched whine whereas you and I have a lower droning noise(?). I wasn't able to find any solid threads so if you have any pointers or updates that would be greatly appreciated. I did see some posts from an '11 A4 Avant owner who stated that they don't have this issue.