Have been noticing a vibration coming from the engine compartment at about 750 RPM for a few weeks now. It is barely noticeable at idle, not noticeable at all while driving, only as the tach passes the 750RPM mark (going up or down).
Finally got concerned enough today and started poking around with a mechanics stethoscope while I had someone hold it around 750RPM and the sound seems to be coming from the turbo or the turbo pedestal. It can be heard when listening against the turbo housing but is the loudest when listening against the pedestal.
I have heard of pedestal problems but I'm not too sure what the story is with the 6.0L turbo pedestals. I'm also not sure if this is a common indication of a problem with the turbo.
As for a little background, the truck is a 2005 F250 diesel, 4x4, automatic, supercab shortbox, with 150,000kms on it. I installed an EGR delete about 3 months ago and the turbo wheel looked to be in excellent shape at that time, with no endplay in the shaft. Aside from the EGR delete the truck is completely unmodified.
This is my first Powerstroke so I'm not overly familiar with them, but I do know this noise was not there 2 weeks ago.
Any and all help or advice is appreciated, we are planning a vacation in a week and will be towing - I'd hate for our holiday to be ruined because of this.