6.7L engine tone changes start to sound similar to a 12-valve.
Injector noise, I assume.
VGT goes to around 30% actual, and the desired truck runs excellently.
Then the tone changes again and sounds normal.
VGT actual goes to 70%, and desired is around 40%
The turbo is a new drop-in Stealth 64.
I have changed the actuator and have the same issue.
I am 90% sure it's electrical.
I have been chasing this issue for over a year.
I've replaced the FCA, back pressure sensor, and multiple other parts.
Tuner has tried adjusting the vain percentage, and it's the same as he says it's the turbo.
The actuator works for sure and is not sticking.
Any ideas would be greatly appreciated.
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