turbo hissing noisy

[gewagon]

Hi I have an Audi 1.9tdi 05 driving it the other day heard a slight pop and then the turbo has a loud whining/hissing noise , when I took of the wastegate acuator pipe (vacume) the noise stopped but lack of turbo power when I put the pipe back on I had full turbo power but the whining turbo spinning noise like the wastegate is constantly open , could this be the N75 Solinoid valve or an air leak somewhere I dont think the turbo is at fault as it is not rumbling or rattleling or like a bearing whine just the spinning noise of the turbo ? ​

 

[reggieroo]

Our allroad has a slight whistling sound from the turbo & wondered if this was normal.

 

[swarcup]

if you heard a poping noise before the hissing i would say that you need to be looking for a pipe that has come off or split.

 

[alictait]

Did u figure out your problem exactly the same thing happened to me tonight ? I thought I had actuall blown a tyre and then lost most power and car went into limp mode

 

[alictait]

Did u figure out your problem exactly the same thing happened to me tonight ? I thought I had actuall blown a tyre and then lost most power and car went into limp mode

Mine turned out to be the intercooler, just posting incase anyone stumbles across the thread looking for answers.