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help with turbo noise

534 Views 7 Replies 5 Participants Last post by  bismic1
2004 6.0 egr delete no check engine light

my turbo is making high pitch squeal happens from about 1k-1800rpm but getting a lil worse

at first i had no power loss but after driving like this a bit (over1k miles probably) now im getting a little power loss accelerating from lower speed and a decent loss at higher speeds and dont want to drive the truck anymore

starts fine and has no smoke on start or while driving... runs and drives fine save for the power loss im now experiencing

i took off intake and checked for shaft play and found none and spinning easily/freely

looked around y pipe and other areas for black soot and found no signs would think if i had leak/crack after 1k miles i would see a clear sign... also no excessive diesel fumes to speak of

checked hose from map sensor to intake manifold ... looked to be in good shape

looked at piping/turbo connections didnt notice anything

checked odb on forscan light only seeing p2285 icp sensor circuit low but no signs of that (starts and idles fine no misfires that ive noticed doesnt stall).... i cleared this code and didnt come back when re started

i was thinging the vgt solenoid / turbo actuator / wastegate whatever you want to call it ... i disconnected the wire going to it and started... squeal was gone.... hit gas pedal a couple times to like 2k rpm and seemed normal and no squeel... also i havent heard the wastegate dump extra boost and cant get it to dump such as accelerating then letting off gas quickly ... i havent driven with the wire disconnected yet

is it pretty much gauranteed the vgt solenoid is not good or is there other things i should check before i get a new one? can i drive with the wire disconnected until i install a new one and what can / will happen if i do drive with the wire disconnected

any help greatly appreciated ive uploaded some vids for future reference to anyone else and help in diagnosing

engine bay idling

engine bay - YouTube

footbraking then accelating mildly

footbrake - YouTube

driving / accelarting

driving - YouTube

20230129 005728 - YouTube

20230129 010650 - YouTube

20230129 105334 - YouTube

i did a bunch of searching with no definitive answer so hopefully this helps someone in future also
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You likely have a broken bellows on the up pipe.
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