2003 Alhambra Tdi - Over-run Whistle

[BigDog]

I have a 2003 Alhambra Tdi 115 with AUY engine done 132k miles.

 

I've got a whistle on the over-run, but you only notice under particular driving conditions: Take it up to >4krpm in 3rd or 4th and take your foot off the accelerator. There is a whistle like a v-belt squealing only quieter and it does not change pitch as the engine slows, and maintains down to under 2.5krpm. It is repeatable. I hadn't noticed this before, but to be honest my driving style is to change up pretty early so maybe I wouldn't have noticed it before anyhow. Sometimes it will still hesistate very slightly very briefly on light load still.

 

• Any ideas - from reading a few threads I am thinking that maybe the vanes are getting sticking on the turbo or there is an air leak somewhere.
  

 

Power seems fine most of the time but I often suspect its down maybe 10 or 15% - i.e. nothing alarming, like having a car full of poeple instead of empty.

 

I replaced MAF in the summer with OE Bosch part due to issues with occasional stumbling on idle, bucking and snatching at light load, black smoke on flooring it and stalling taking up drive, which cured all those issues.

 

Also I did pull a 17965 fault code from it once recently using VAG-COM (17965/P1557/005463 - Charge Pressure Control: Positive Deviation) see here: http://wiki.ross-tech.com/index.php/17965/P1557/005463 however since I've not notice any limp-modes I am assuming this hasn't recurred (will check) and the orignal one must have occured since the MAF change (last previous scan) and without the wife noticing (?!).

 

The car has always had quite a loud in-take roar on the drivers side, when accelerating which niether of my other 2 TDIs have/had (Arosa 1.4 AMF and Audi 80 1.9 Z1). Haven't bothered to investigate that too much (yet) as it has never changed and is not too obtrusive but any ideas would be gratefully received on that too.

 

All the best,

 

Matt

[seatkid]

My guess would be a gunged up EGR valve.

 

I cured my whistling EGR by using Millers Diesel Sport Additive and a few Italian tune ups.

 

It also cured its asthmatic performance, helps it fly through MOTs, makes it run silky smooth, start first turn, does 50+ mpg and makes/fetches me a cup of tea in the morning to bed........wait a minutes that's my wife - one of the other loves of my life ;)

Edited December 7, 2009 by seatkid

[BigDog]

Many thanks, will give it go. :)

 

Matt