09 Cummins 6.7 issue

[ak diesel driver]

Got a buddy that is having issues with his 09. Recently replaced the turbo cause the vanes were stuck and the center section was leaking. Now he's started having issues with the exhaust break engaging whenever it wants to . If he pushes the button to disengae it it still engages whenever it wants. He's also having boost issues as in excessive boost but randomly.
Thoughts?

 

[THEFERMANATOR]

Was the vane position sensor replaced or reused? Was the controller reused, or did the turbo come with one? Is he checking the boost via a scanner, something plugged into the data port, or a seperate guage? I believe that truck uses a slide sleeve instead of variable vanes with a electric servo controller. I've heard of a few having issues with the gears stripping or breaking from the turbos getting sooted up, and the servo pushing against it breaks it. Could also be a bad boost sensor possibly not reporting the correct boost.

 

[ak diesel driver]

Don't know on the turbo stuff. Is reading boost off of the obd port via a mighty max?

 

[THEFERMANATOR]

That pretty much leaves an issue with the turbo controller. If a scanner is seeing the boost fluctuation, then that pretty well says the boost sensor is working. I would be checking the wiring at the turbo and looking hard in that area.

 

[ak diesel driver]

looks like he fixed it. played around with the wiring going to the controller and now seems to be ok

 

[3500GMC]

Good to know, thx for posting results. Ug me Learn new stuff good