cm870 ISX Turbo Screech Monroe/Charlote, NC

[Magnum1]

(04-07-2023 )wrenchwabbit91 Wrote:  i had this problem on an 870, turned out to be the pressure regulator in the vgt controller. i would check what the others have posted first, i think the controller was $1200... the ecm was commanding 70% to the actuator but it was maxed out at full air pressure.

were you able to watch the videos that I have on Facebook - it does look like the vg actuator could be pushing the vg crank little further than it should, maybe, as when I ouch it up with the pry-bar, noise stops.