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It could be that you're not getting power to the WUR, which would mean the bimetallic spring isn't warming and raising control pressure. That would be a simple check first, then have a pressure gauge on there with the ignition on to see whether the WUR raises control pressure once current is applied.
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Jonathan.
87 930, 993 turbo engine, RS Tuning 520PS/515lbf-ft, Arrow Rods, ARP hardware, Solid lifters, G50-50, RS Flywheel, 890nm Sachs clutch, RSR coil overs all round, 993 C4 calipers front, 930 fronts on the rear, Ruf Speedlines.....
Old 540 BMW, XB12S Modified, for being a total hooligan 
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