alright, so while doing some reading for another problem I found something kinda interesting, this was on a TDi Jetta so I am not sure if it applies, but apparently a cracked hose around you EGR can cause a whistling effect under acceleration?


maybe this is the culprit?

 

mine didnt suck either using the traditional seafoaming spot, but as I was reading through the forums I found a post by Sineo that showed an alternate vacuum hose to use - upstatenya4 you might try that? I tried searching for it again but I didnt have much luck

 

Yeah, I had my windows down yesterday gunned it, and I swore I had a turbo under my 12v... Mabyeeeee the Audi makers put a secret turbo in the engine somwhere where we can't see it in the 12v's....

 

My A4 makes a high pictched hiss too, especially noticable under bridges. Only, I get a "Psssh" sound when letting off the gas. I hope it's nothing major...


Okay, on a more serious note, on my old 97 NA Eclipse, I hod a small split in an intake hose somewhere and sounded an awful lot like a turbo when I gave it gas...
I'm gonna go with CAB509 and 2nd this as a possibility.

 

sounds like a cracked mani, especially the one case where the vacuum system wount suck seafoam

 

When I turn my car off I can hear a "Psssshhh" sound from my engine (12v). It has done this since I got it a couple months ago. I found a vac line that has started to deteriorate and I am assuming that the sound is air escaping from the line. I have not heard it when I am in the car and the engine is running though, but I will run it and open the hood tomorrow and see waht I find.

 

haha pete, it may sound like it but it doesn't feel like it does it? lol. ya cbg, it's prolly something with the vacuum, hope it solves it