High pitch whistling/squeeling at wot.

[my95tsi]

Ok this is officially driving me crazy. I don't know where this sound is coming from but it only happens in 1st and 2nd gear. As soon as i get on the gas and get past 5psi i hear this whistling sound. I don't know how to describe it but it's high pitched and stutters repetitively all the way through fulkboost. It almost sounds like a boost leak but i checked all hses and all seems perfect. My vac is 19 and my boost hits 15-16psi all the time. It used to only do it once in awhile but now it does it all the time. I thought it might be my turbo going bad but it spools fine and sounds fine until i hear the whistling, then it over-powers all turbo sounds. But the odd thing is that it won't do it in 3rd, 4th, or 5th gears. Does anybody know what this could possibly be???

 

[black97dsm]

I have a 97 non turbo and it makes the same noise i does it at about 5k all the way until shifting i too am at a loss as to what it is

 

[my95tsi]

i'd like to say it's the same thing but it probably not. Mine does it once it hit 5 psi in now 2nd and sometimes 3rd. It sound slike a boost leak or pressure leak of somesort but i check all connections and hoses and all is good. Plus i'm getting full boost.

 

[the1cancer]

check for shaft play on your turbo. your turbo will still boost well but you might be slightly scraping the sides due to too much shaft play

 

[my95tsi]

Well i figured out what it was. My egt probe was leaking from around the connection at the manifold. I should have recognized it before b/c exhaust leaks usually make that sound.