Hi everyone,

I´m an A4 1.8T 2001 B6 owner from up north Sweden. I have a really strange noise from my engine.
It´s like an "burr" sound coming from the engine while in gear driving, quit like a frog :-)
The "burr-sounds" comes regular about every 15-20seconds while I'm driving. It happens from approx 1200rpm to 2500rpm, no matter what gear I'm using. The sound might be in the higher revs as well but it's kind a hard to hear.
I have only heard it when the engine is 90 degress warm and only with gear, never on idle. I had this strange sound for 8months and it has not got worse.

But if I rev my car up on idle to around 2000rpm I sometimes can hear a slight rattling/vibrating noise, but not very loud at all.
Are these two sound connected? I´ve read alot about the cam chain tensioner but my car: [ul][*]Doesen't sound like an diesel[/ul][ul][*]At idle 900rpm everything sounds normal[/ul][ul][*]No rattling around 1100rpm (which many other people with chain tensioner problem says they have)[*]Sound like an frog doing "burr" for 0.5 sec every 15-20 sec while driving. :-)[/ul]
Please help me, my swedish audi forum is down and I would really need know what this sound is. Any ideas are much appreciated.
Best Regards.

 

it could be the DV ( dump valve )

edit: people pay big bucks for that noise