I have an 1997 850 R Turbo. For the past month I have been hearing the sound of a vacuum or air leak. It sounds like it is coming from the front left. The check engine light came on and is pulling the code P0440, EVAP Emission Control system malfunction. I checked the gas tank cap and all the hoses, including the ones under the battery holder and the manifold hose. I couldn't find a leak. What would be the next step in finding out where the problem is? How can I diagnose if the problem is the air pump, the SAS valve or the cruise control pump? I don't think it is the cruise control pump b/c it is an emission problem. Is there something else it could be that I'm missing? Thanks for your help.