Strange turbo noise

[Brieldo]

Recently a buddy's 6.0L has developed a very high pitch whine that appears to be turbo-related. It doesn't occur at idle, but when the RPM's are higher (ie. using high idle, driving down the highway,etc), this noise is present. Disconnecting the harness for the VGT solenoid makes the noise stop.

Any insight on what might cause an occurrence like this? Really hopeful the turbo isn't smoked internally.

[Brieldo]

I should add we checked all the intercooler boots and the y-pipes for leaks and everything is fine. After disconnecting the VGT harness and noticing the noise goes away seems to isolate the issue to the turbo itself.

[kingranch250]

Mine was doing the same really high pitch wine almost like wistle turbo was toast

[L&B]

Mine did this also, but only on deceleration. It started just after an egr del, ELC conversion, turbo disassembly and cleaning etc. Not the degas bottle cap since it did it when loosened. Not an exhaust leak, not a IC boot leak. Finally switched my Edge to look at VGT and noticed that it only happened at 85% - which was pretty much anytime I'd backed out of the throttle, since I activated the "Jake brake" option when I installed the tune. Turned that off, and the noise disappeared. If this one is doing it under load, that isn't it.

[Brieldo]

Anybody else? Seems to me a cracked y-pipe would cause this. I'm just unable to see any soot buildup anywhere.

[sonds]

If y pipe or up pipes were cracked you would not be building boost. Can you monitor boost psi?

[Lilpooh]

Have you checked for play in the turbo shaft. Here is some more turbo info for you.

http://www.forddoctorsdts.com/articl...rokeEngine.pdf