Hey guys, you lot are a brainy bunch and I know a couple of you have/have had TDI cars, I would like your advice on an unusual noise it's started making. I've had my Mk1 Leon (Cupra FR TDI) for about a month now, and he's been going fine until Friday. Basically what happens is the turbo kicks in as usual around 1.5k rpm, everything seems ok. However when the RPM reaches about 2.5k+ a high pitched whistle comes in, higher in pitch and louder than the usual turbo whistle. It only does this under load and while accelerating, and as soon as I let off the pedal it disappears. There's no perceptable power loss, and no black smoke that I can see, though the noise can be heard clearer at the rear of the car (apparently).
I've had a quick check for boost leaks in the usual place and found no loose pipes, but quite a lot of oil on the underside of the intercooler. Not sure on oil consumption- it hasn't dropped much if any, but am currently keeping my eye on it.

Cheers in advance guys,
Badger

[Edited on 19/9/11 by Badger_McLetcher]

ON mine the turbo is quite whistleeee compared to my last tdi, how many miles has yours done?

I was going to say turbo whistling when I saw the title, sounds like an air leak some where

Split in the trunking

Split piping somewhere

My money is on boost leak somewhere.

If you're absolutely certain theres no leaks then get the intake pipe off and have a feel of the turbo shaft. Check it can't jam against the casing in whilst applying force in any direction (up, down, left, right) as well as whilst applying longitudinal force to the shaft

Right, cheers for the info guys. Kinda new to all this turbo diesel malarky Will have a proper check over it tomorrow.