AFAIK, the valve should be closed when it is not energized. My assumption is that the electric valve is there so that the ECU can control the supply of vacuum to the SAP valve.
If it has failed open, the vacuum should be supplied to the SAP valve all of the time. You should see a vacuum at the SAP when the car is running. Of course the valve could have broken so that the vacuum is not passing through.
That valve is in a difficult place to reach. IIRC, it's mounted with a clip on a bracket. I think you push the tab toward the firewall to remove it, but I'm not sure about that.
It may be easier to remove the bolts that hold the plate to the manifold. I've attached a couple of pictures.
2001 530i/5 S+P CDV delete/Akebono ceramic pads
M5 SSK/RedLine MTL/M5 rear sway bar/Bilstein HD
BMWCCA Member #337964
Last edited by Steve530; 01-28-2013 at 05:22 PM.