Turbo Diesel whistle

[Vlad]

Not a Merc I'm afraid, but a VW with the 1.9 Turbo Diesel engine (2005 car)

Having had a number of VW's with this engine and been driven in a fair few additonally, I know that you tend to get a bit a turbo whistle from them, but I've got a Touran which is making quite a lot of turbo whistle/whine especially at low revs

Any ideas what makes the turbo make this noise?

 

[Dieselman]

Technically it's if the impeller is unbalanced, but could also be if overspeeding due to the vane ring being jammed.

 

[Vlad]

Is there a fix for either of these two issues which does not involve having to replace the turbo?

 

[Dieselman]

I would check the vane ring is free to move properly.

 

[BTB 500]

Never had any noticeable turbo whistle from our Audi A4 with the same engine (on about 135k miles now)

 

[Rorcus]

possibly a split in the air charge pipe..

 

[Vlad]

Popped into the local VAG specialist....without the car I should add, as I was in another and they reckon its as stated a lose or split charge pipe (common) or the bearings in the turbo which would be a bummer as the car has only done 54k.

Got it booked in early next week for them to have a look at.

 

[BTB 500]

More likely to be the pipe, I would think. Mechanically they are pretty robust.

Good luck!