I have a 97 9000 aero manual. I have a boost control valve to adjust the turbo boost. When you open it it gives you a lot more boost when you close it a little bit it gives you less boost. Now it doesn't matter whether its closed or opened it gives the same boost. I removed the hose from the apc (the hose that goes to the wastegate) and boost does not change. The boost it gives is not bad but I had more boost before when I want it by adjusting the valave. Can someone help me out on why this happened?