allroadken

Okay, I've only had my ar for less than two weeks, but I've noticed in the morning that when I first start it up, the 2.7t has a buzzier sound than usual. It lasts for about 30 seconds, or until I've driven maybe a 1/4 of a mile, and then abruptly stops. There's no sign of anything wrong with how the car accelerates or performs otherwise, and I never hear it except after my ar has been sitting up. (I sometimes hear it when I get into the car after work.) It sounds like it's coming from the driver's side, and the buzzy growl definitely correlates to engine revs. Is this normal? Something that spins up briefly then stops? Or do I need to have the car checked by the dealer? So far I've put about 1,400 miles on it, and have loved every single one!

Ollie

All allroads do that, only happens when engine is cold. Related to heating up the catalytic converter to reduce cold engine emissions. I think that acceleration/performance feels reduced as well.

allroadken

Thanks, Ollie. I was hoping it might be something like that. Otherwise, the car's been flawless, and now that I've passed the break-in period I've been able to toss the car around a bit more. So much fun!

Frederic

Mine makes the buzzing sound as well, my A6 doesn't, but figured it was part of the normal warm-up procedure - nice to know the reason behind it.

JBaumgart

It goes away after just a few seconds. Anyone else experience this?

Frederic

<center><img src="http://pictureposter.audiworld.com/2370/ar-lo-lfq-01-small.jpg"></center><p>Might as well get all the various noises heard at start-up sorted out. I hear this "lifter" noise at start-up also, very briefly though. It does sound like a valve train associated noise but could be the pneumatic suspension, as it too seems to be making minor adjustments at start-up. Probably all very normal, just so accustomed to the absence of an odd assortment of noises coming from the 2.8 in the old A6.

As you can see, I always try to score a parking spot as far away from the hoi polloi; trying to keep the allroad as door ding free as possible.

alibaba

This again happens only for a minute or two. The others must also be getting that too, right? ... Right?

Belmont

I had the same concern until I found this previous posting:

"Re: warm up problems-sputtering and nearly stalling
Posted by JC-allroad on 2001-09-26 16:40:01
In Reply to: warm up problems-sputtering and nearly stalling posted by TTroy and jen in CO on 2001-09-26 09:24:09

The sound or sputtering is from the: Secondary air injection system (AIR) in short. The system uses an air pump to inject fresh air behind the exhaust valves for approximately 100 seconds during OUR cold start.

And after each subsequent engine start (up to 96C or 205F)the system will, switch in for 10 Sec during idle and is then monitored by itself, with a 20 sec delay.

What it's for?? Reduce exhaust emissions during engine warm-up and save our catalyst.

So, enjoy. And don't worry.. It's made that way.."