Turbo Whistle... Possible Fault??

[gazbutS3]

Its the diverter valve, basically does what a dump valve does, releases boost preesure on closed throttle

[shamrock]

My s3 whistles in fifth gear only at a specific rpm.  Is this that noise?

[Pullafacial]

Don't think so shamrock. All seems fine driving at constant speed.
Problem is when I floor it, it picks up strong for a split second then the turbo whistle turns in to a noise like escaping air and power is immediatley down.

Anyone know if I can pop the dv out without getting the car on ramps?

Steve

[gazbutS3]

Don't think so shamrock. All seems fine driving at constant speed.
Problem is when I floor it, it picks up strong for a split second then the turbo whistle turns in to a noise like escaping air and power is immediatley down.

Anyone know if I can pop the dv out without getting the car on ramps?

Steve

not on a regular GTI, you really need it on axle stands at least as its bolted directly to the turbo

[Pullafacial]

Just booked it in for next week at the garage I bought it from to have a look and investigate a wheel bearing noise as well.

Also, just booked getting my seriously scuffed 18" Monzas in for a "black" makeover aswell.
Can't wait to see the results.

[Pullafacial]

Quick update - Took the car in first thing this morning to get sorted.
Just recieved a call to ask if they could keep the car over night as proving a bit more in depth.
Hopefully will know the outcome tommorow!

[cuprak1]

what's a dv?

Diverter valve 

[Pullafacial]

Well, got the car back today and have a feeling this is gonna take take some sorting!
The garage found a slightly loose pipe which they thought had fixed it but still the same. It just feels really flat and sounds like pressure is leaking before the foot comes of the throttle. garage have said to bring it back and they'll have another look trouble is they're 20 miles away and only open when i'm at work.
They have also established that the wheel bearing noise is infact tyres. they've changed them onto the front but i'm trying to get them to sort it as it drives me mad!

Anyone got any ideas as to what the problem could be? After much reading on here i'd convinced myself it's the DV.

[SteveP]

Some simple vcds logging will confirm if it's a boost leak, and then Replacing the DV is a sensible next step if all the hoses have been checked.

[TDIfurby]

Sorry to bump an old thread, but a colleague (with a stock Edition 30) is having a whistling noise but only on tickover, and not from cold.  The whistle goes away on boost and not apparent on cold starts.  Any thoughts?  Suspect the DV is not to blame in this case due to when the whistling is occurring. 

[56OctyVRS]

Check the PCV valve as they can create a whistling noise and also lose you power when the check valves inside break.

[Saint Steve]

Check the PCV valve as they can create a whistling noise and also lose you power when the check valves inside break.

Also hear a hissing sound after shutdown coming from under the top engine cover if the main diaphragm has blown.