2006 F250 6.0 Bulletproofed. While pulling my 12000 lb fifth wheel...using any SCT towing tunes , tow button pushed, sometimes ( qjite often)
when the truck shifts into overdrive, even going up a hill, the biist drops to nearly zero. when I put my foot into it ti downshift, boost comes back to about 10. used to stay around 20 while pulling. any Ideas ?

 

The collector ring is most likely sticking. The turbo may need to be cleaned.

 

What's your turbo soloniod % at when it happens? If it hangs at either 15% or 85%, you are sticking.

Richard

 

Richard, it does not do this unless im pulling.
how do I verify my solenoid % ?

 

It's usually called VGT%. What engine monitor do you have?

richard

 

I just have an sct tuner

 

I don't know that one personally... Can it read live data? If not, get a elm327 and torque pro or forscan.

Richard