2008 ISX major turbo squealing

[Rawze]

(08-13-2016 )389guy Wrote:  I will do that. And it was done by a respected member, but please don't get confused, I am not blaming the program. I believe I may have already had actuator problems and a tune just uncovered it.

The squeal is a boost leak somewhere, most likely the turbo mounting gasket, or an exhaust manifold gasket.

It sounds like you turbocharger is on the fritz and loosing its calibration. I have heard of that before, where one time they will run right, and the next time you start the truck, it will run too high.

It could also be ... the symptoms of an engine that is starting to jump into high altitude correction possibly because of aging/poorly reading sensors. I would suggest an update to the latest ver of MM and having it checked for this.