2001 A6 2.8 engine noise

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2001 A6 2.8 engine noise

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2001 A6 2.8 engine noise - 5/11/2008 11:52:55 AM

ynn18

Posts: 3
Joined: 3/18/2008
Status: offline

Dear all,
I purchased 2001 A6 2.8 quattro 3 months ago. it is 83000km now. It was fine when I got the car and recently I feel the engine noise is bigger than before and it seems to be not as powerful as before. During driving car, when I press acceleration, rpm goes up and during this time engine makes bigger noise and when rpm drops, engine noise reduces. this happens not consistantly. Sometime it is ok, sometime it is not.The idle is as quite as before.

Is it possible a timing blet issue or a synchronize problem of the sparkling?

Thanks for any help.

Post #: 1

RE: 2001 A6 2.8 engine noise - 5/12/2008 12:01:20 PM

AZAudiA6Q

Posts: 563
Joined: 11/14/2007
Status: offline

When was the last time you got your oil changed?

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Post #: 2

RE: 2001 A6 2.8 engine noise - 5/12/2008 12:12:34 PM

Jeffla

Posts: 578
Joined: 10/31/2006
From: Minneapolis, MN
Status: offline

Sounds to me like you are describing the sound of your mechanical fan. If so it is completely normal. You are only hearing it now because it is getting warmer out.

That's my guess.

Jeff

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''''00 A6 Avant Quat 140k

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Post #: 3

RE: 2001 A6 2.8 engine noise - 5/12/2008 8:43:29 PM

ynn18

Posts: 3
Joined: 3/18/2008
Status: offline

thanks guys.

I changed my engine oil about one and half month ago. And I used 5w30 non-synthetic. Should I be better with synthetic?

Jeff, I think you might be right. Just one more question, will the fan run faster by default when I accelerate the car?

Many thanks and have a great day!

2001 Audi A6 2.8 QUAT

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Post #: 4

RE: 2001 A6 2.8 engine noise - 5/12/2008 8:59:23 PM

frankinstyn

Posts: 179
Joined: 2/26/2007
Status: offline

quote:

ORIGINAL: ynn18
Jeff, I think you might be right. Just one more question, will the fan run faster by default when I accelerate the car?

There are actually two fans on our cars. One is electric and only has a couple speeds. That is the one on the passenger side.

The other is run off a hydraulic clutch directly off of a pully. That one tends to engage more in hot weather. It will speed up and slow down with the engine speed with a little delay as its clutch is hydraulicly activated. My 2.8 Avant has that one running lately as well. However I don't notice any decrease in power. That fan simply doesn't take up that much hp or torque.

I should also mention though that mine isn't stock. I don't know if my has the tip chip or not but it has at least been reprogrammed. Don't know if the engine has been chipped or not. Just don't have a history on it.

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RE: 2001 A6 2.8 engine noise - 5/12/2008 9:06:15 PM

frankinstyn

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Joined: 2/26/2007
Status: offline

I should also mention. Are you running the AC? It will come on automatically unless you press the 'econ' button (light lit). That will definetely make your performance decrease.

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Post #: 6

RE: 2001 A6 2.8 engine noise - 5/12/2008 9:48:17 PM

Jeffla

Posts: 578
Joined: 10/31/2006
From: Minneapolis, MN
Status: offline

I don't really feel a loss of power when the mechanical fan engages, maybe a little. Now on our BMW it is very noticable, but we did buy a cheap aftermarket one for that car.

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''''00 A6 Avant Quat 140k

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Post #: 7

RE: 2001 A6 2.8 engine noise - 5/13/2008 9:34:48 PM

ynn18

Posts: 3
Joined: 3/18/2008
Status: offline

I did start noticing the noise in a day about 76F. I think the hydraulic fan is highly possible reason.

Thanks a lot guys. I guess I got enough answers about the concerns I have. Will cancel the appointment with dealer service.

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Post #: 8