Johnny-RS4

Hi guys

I have a 2008 Audi RS4 Avant (B7) and experience humming noise which starts at approx 3000 rpm and continues up to 4500 rpm. Tone pitch (frequency) increases with rpm. It is a pretty high tone though.

Anybody know what the problem is?

Any help is appreciated. Thanks

Johnny

BADRS4

Can you record a video with your phone or something? Sounds weird.

Reggie

Does it matter what gear you are in?

Johnny-RS4

Hi
Yes, independent on which gear.

Johnny-RS4

Actually, I have experienced something similar with a Audi S2 some years back. Here the noise came from the fuel pump located at the rear of the car. Could this be it?

BR
Johnny

India Whiskey Charlie

Yes, electric fuel pumps do hum. And, if the noise is from the rear (gas tank), it could be it. However, it should be pretty constant and can be heard even at idle.

Johnny-RS4

Hi guys,

Gathered some more info on the humming/howling tone in my RS4. It is most hearable when seated in the drivers seat, less in the passenger seat, and even less in the rear seats.

It is present also in idle (when engine rpm exceeds 2500-3000), but lot very loud though. The humming/howling becomes louder when the engine is stressed (through acceleration) compared to going at steady speed.

Again, the humming/howling starts at approx. 2500 rpm and continues until approx 5000 rpm. The frequency of the humming/howling increases with rpm.

Anybody out there knows what this could be?

Reggie

Any aftermarket stereo gear??

nooB5

Hi Johnny,
Is the RS new to you? If not, has this sound just recently started?
The noise you describe, is it more of a higher pitched whining noise (similar to a supercharger)? Does it come from the back of the motor?
If you answered "yes" to both of these questions, I'd be willing to wager it's the signature B7 RS4 sound which comes from the straight cut gears which run the A/C compressor and the power steering pump.

See the following thread and scroll down to post 94 for visual reference:
http://www.audizine.com/forum/showth...-up-date/page3

Hopefully what you hear sounds like this:

Johnny-RS4

Hi nooB5

Thanks a lot. You have nailed it. I'm new to RS4 (only had the car for a couple of months). Also, "yes" to your two questions, it sounds like a supercharger/turbo and comes from the rear of the engine. And the sound from the video is what I hear.

You have convinced me that the whining noise is not a severe engine problem. And I'm truly happy about that :-) but do you see any means of removing/reducing the whining?

Thanks....