870 that whistles

[hhow55]

(12-18-2023 )Zapah Wrote:  I have an 05 870 that when the turbo begins to make any boost over 5-6 psi. Starts to whistle in a different tone than the boost of the turbo. Changed the exhaust manifold gaskets. #2 and #5 were blown out. Replaced now not leaking. Checked and changed the cold side boost tubes. Found a bone needle sized hole. Changed the egr bello.gaskets and new clamps …. Still have this what sounds like a boost leak. ??? Checked the hot and cold side with soapy water found the hot side had small leak. Adjusted them. Solved that. Still have that blowing noise once the boost rolls in?? I’m stumped Thanks

I once had a whistling noise like you describe.......And it turned out to be a loose bolt on top of the the egr valve.