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Message:: [QUOTE="pawpaw1, post: 3060693, member: 71457"]Oh, one more thing. There was another thread , I think on here , and I think the man also had a Volvo. He was not getting the right boost pressure , either.  Some of the others can check me on this , but I think I learned , on that thread , that the VGT turbo in controlled by air pressure. The way his air system was plumbed , it turned out the actuator for the turbo was not supplying enough air , at the right pressure , for his turbo to work correctly. He went thru his supply , I think he said from his air tank forward , and replaced the air lines and fittings.  Solved his problem.  I think he said he had front ( steer ) air bags , and they all ran off one supply hose.  Hope that helps.[/QUOTE]