Jet engine revving for takeoff?

[sdewitt at stx.rr.com]

That is the secondary air pump. It only kicks on when cold and supplies extra O2 for catalyst warmup. Wither your intake hose or exhaust hose from that pump is bad. The pump is located under the right hand side of the front bumper, almost underneath the airfilter housing. There is a hose which goes from the air cleaner to the pump, then to what looks like an EGR valve. All cars from 00 onward have that pump. Check the hoses and one will be loose or busted.

A hose for my 00 A4 was 20 bucks. 

----- Original Message -----
From: Andrew Duane <andrew at savaJe.com>
Date: Wednesday, July 21, 2004 9:46 am
Subject: Jet engine revving for takeoff?

> After the 60K service on my A62.8Q, I have an interesting
> (and scary) new symptom. For about 30-60 seconds at cold start,
> the car makes a sound like a jet engine revving for takeoff.
> It's not the A/C, which was turned off, but sounds like it only
> MUCH louder and faster. It seems to be coming from around the
> air intake path. The air filter was replaced as part of the 60K.
> 
> Then it shut off while backing out of my driveway, kicked on
> once again for a few seconds 300 yards down the road, and is
> now off. It never happened yesterday when the car was warm.
> 
> 
> Also, after my battery almost failed to start my car yesterday,
> the one-touch up/down on my windows now works intermittently at
> best. The windows work OK, just have to hold the button sometimes.
> 
> -- 
> 
> Andrew Duane            Member Technical Staff - ATG
> SavaJe Technologies     andrew at savaje.com
> 100 Apollo Drive        p: 978.856.4943
> Chelmsford, MA 01824    f: 978.256.8386
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