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Discussion Starter #1
'01 Audi TT Quattro 225hp AMU

When I'm driving about 30-35 mph, maybe 40, there is sometimes a "whistling" sound. Not high pitched, not following engine RPM, not even following what I would expect to be turbo RPM. Sounds kind of like the wind whistling in trees or around hollow areas of buildings, terrain, etc.

It's been doing this on and off a few years and hasn't got either better or worse. (Car has been in storage much of that time with few miles driven.)

Any ideas what to look for?
 

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Discussion Starter #2
I am hoping this is just a vacuum leak, as I have found my brake booster hose is cracked at the fitting that goes to the brake booster. Found that tracking down a P1136 (lean.) Tested by covering split with duct tape. My fuel trims moved back toward normal. Still whistling, but a little louder and more frequent, so probably more leaks elsewhere (or the duct tape isn't sealing completely.) I'll get a new hose on there as soon as I can find one.
 
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