Odd air whistle LHD
 

2003 A4 1.8T. The steering rack was leaking bad so i brought it to my mechanic that works mainly on audi and volks. He did change the Steering rack, but when i took the car and drove off, i could hear a unusually loud whistle on the LHD, it sounds like a turbo hose leak. When you put the car on neutral and rev i hear the leak but a little less loud. It is louder when you accelerate, probably because the engine as load.

So i brought the car back in and after a afternoon i took it back and they didn't find the leak.

Now first is there a pipe or anything with enough pressure that could whistle in the way of a steering rack replacement job? I doubt but i have to ask since i didn't do the job myself. Assuming i have a leaking collar, hose or intercooler how could i find the leak?

Suck i do not have a boost gauge i could probably see the difference in pressure if it is leaking. I also feel the car as less guts at low rpm.

Thanks for the help !

nobody?

is it a whistle or dentist drill? ARe they any codes being thrown? Normally vac leaks will throw a mil.

Whistle, no dentist drill. and no check engine or code.

I've tried to do a test without success. I made a cap with a 0-30 psi gauge and use it to pressurize the pipe at the turbo inlet 5@10 psi. at the same time i removed the pipe to the pcv valve and a other one before and blocked those off. But i notice that after the pcv there is a other T with 2 more pipes just before the turbo outlet. So even if i raise the pressure to 10psi i can here a leak and mostlikely through oil because i hear air bubbles.

So that pressure test wasn't conclusive since i could block all connection on the rubber pipe at turbo inlet. It is coming from the Intercooler corner but i just cannot locate it.

I'm going for a drive and will try to record the sound, oddly when you are standing outside the car you cannot really hear it but sitting inside it is pretty obvious.

It sound like muffled air whistle of a house central vaccum unit