I have had it in to cvi and Butch says there is a shim inside the pump that is wearing and it could use a rebuild, but he said if the pump is not leaking, and with the symptoms I have I should wait till the pump starts to leak before I bother to rebuild it. Problem is I live in Calgary, not exactly the center of the mitsubishi world. If I have an issue I will have to ship the pump to richmond, get it rebuilt, and reinstall it and time it. As expensive as a full rebuild is I will probably wait till it really needs it I guess. I suppose Butch would know best as he is the mitsu guru....