Strange sound when I lift off the throttle

[tayles]

I've had my 1998 Golf GTI 1.8T a few weeks and since owning it I've noticed a slight noise every time I lift off the throttle.  It's not a loud dump valve wheeze like you hear on some cars.  I can only describe it as a slight whickering sound.  I've always assumed that this is normal sound for the turbo to make, but I've got to thinking that maybe it's not.  Is this usual?

Russ

[GazB]

Sounds like the recirc valve or wastegate, if the car is mapped or has a cold air induction it will be louder

[Daz...]

I'd say it's the wastegate.

[tayles]

Are any of these things a problem that need sorting out?

[ryushi]

Read this thread http://www.golfgtiforum.co.uk/index.php?topic=644.0

Sounds like the usual recirc valve going, V easy to fix :



I replaced my diverter valve/dump valve/boost valve whatever you like to call it, when I first got my golf  it fluttered since I got it, part cost £21 from VW (parts guy called it a dump valve, didn't know what a diverter valve was)
Took me 5 mins to take the old one off (VW clamps are a bit of a bugger to remove, careful not to damage the hoses)
and took 5 mins to put on the new diverter with new jubilie clamps on.

My car no longer flutters and is completely silent on gear changes, thing is, I kind of liked the flutter, oh well