When it first happened I thought it was a oil seal in the turbo gone. Then I thought the air system was blocked, my mate happened to have a small video camera on one of those snake things, kinda like a boroscope, in his work truck so we put that down the snorkel to the air filter then after the filter to the turbo. Nothing wrong.
By this time I had no idea and didn't even know where to go next, and by fluke my mate noticed that when I revved the engine, the elbow between the turbo intake and the air filter hose sucked in about 10mm. I felt the hose and it was all soft. So we hooked the camera up to look at the elbow and went for a drive. Fare enough when I caused the problem to happen the elbow collapsed totally starving the engine of air, problem found. Now all I need is a new elbow, but this time I want one that has a spring wound around inside it so it cannot collapse on me.
Just thought I would share this little experience, you never know it might just help someone.
