What's vref reading?
Have you cleaned the negative grounds at the frame and body? What's your overall main voltage at when get to work... I'm on the phone so I can't see the data.

 

5volts. Voltage is good and grounds were cleaned past summer. 14 volts

 

4inch turbo back.

 

Truck ran 6 months ago like a raped ape. Problems started thought it was stuck ring in turbo. Replaced turbo confirmed old turbo ring was stuck. Thought I found problem went to drive it and same problem is there. So I guess it was stuck vanes and something else. Nothing else has been done to the truck. Still running stock tune untill I find whats wrong. All of my data logs have been done STOCK TUNE and the only code that comes up is for EGR low flow.

 

Have you considered cracking open the new turbo to inspect the unison ring/vanes?

 

Did the new turbo come with a VGT solenoid or is your old one being used in the turbo. Is the turbo a stock version or upgraded to a stage 1 or 2. Has a VGT relearn been done? No CAC leaks boots are good? Hole in your intercooler? Uppipes cracks? All turbo to exhaust clamps lined up and tight? No soot or black on the firewall? Exhaust Manifolds cracked or leaking.

 

VGT solenoid is new came with stock new turbo. VGT relearn was done even though I was told that 05-07 didn't need it done. But had same problem with old turbo. All turbo clamps have been checked 3 times and are good no soot or marks anywhere. Pressured intercooler and it held air 20psi.

 

At idle the vanes sweep. You can hear the exhaust note change and the gauge confirms that they are moving when the exhaust note changes.

 

I know this is completely off subject but bear with me. When I went to tech school, I remember learning about something called wheel bearing burnelling. Class 8 trucks would sit on a dealers lot for a few years sometimes having not been driven before they would sell. The wheel bearings would sometimes fail prematurely. They found that since they sat in the same position for so long that the rollers on the bearings would leave tiny little cup marks into the new races. So when the truck finally got put into service the races chewed up to rollers. It was very rare.

With the age of our trucks and most people not having to replace turbos, usually just a good cleaning or rebuilding gets most by, I wonder how long the new turbo you bought sat on the shelf in a warehouse. Could it maybe be possible the unison ring/vanes have a kinda memory groove? Just trying to come up with something to help ya out with this head scratcher. Seems like you have gone through all the diagnostic checks multiple times and everything is checking good. Hopefully the issue isn't hidden in the new turbo this whole time. I know this endless diagnosis coming up with no problems sux big time. Just figured I throw out a thought.

 

The problem was there with the old turbo. I don't think that the new turbo has anything to do with the problem.

 

But the catch is; it was happening before the new turbo, why he replaced the turbo, unless I'm wrong?

 

The turbo would squeak after start up. I was thinking that the unison ring was stuck and that was why the trucks boost was fluctuating. That was confirmed when the old one was disassembled. Thinking my problem would be solved. But same problem present with new one minus the squeak.

 

I think your EBP sensor has issues,have you checked for wiring issues?

 

Yes and have been told that my numbers in the data log looked fine. Feel free to look at the zip file in this thread and see if you see anything. I hope you can. Lol

 

Did you have a leaking coolant cap or puker? You might look carefully, I had a issue like that and even though I hd good numbers the EBP sender was FUBAR.