[Biturbos4] Startup Noise 2002 S4

[Al Adler]

If you have a tiptronic its probably the air pump that you're hearing. 
Manual's don't have them. It only runs for a short time after a cold start.

TTFN,
Al

Long, Scott G A1C USAF AFMC 88 SFS/S4W wrote:
> When I start my car after it's been sitting for a while (morning or
> after work) it makes a high pitched whirring/grinding sound from the
> left side of the engine for about a minute, after that it stops. It runs
> and drives fine. If I rev the motor while it's making this sound, the
> tone does not change at all, it stays constant. Because it stays
> constant I don't think it's turbo related. 
>
> Any ideas what this may be?
>
>
> Scott G. Long
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