I could suggest the seals in the rack are bad allowing pressure loss in system. Just like in vanos, seals go bad fluid passes right through. My 2¥. I think the only way to verify rack seals bad would be to loosen boots on rack. If anything there besides grease, ie ATF fluid, there's your problem. Worth the investigation. Cheap to replace boots, if that's not the problem.
Last edited by sfcjetjr; 01-12-2013 at 08:08 PM.