Turning the ignition-on with sensors disconnected - a bad idea?

[garrett.fell]

So I am wrapping up my valve cover, front timing cover, valley pan and hose-change project. Before I put the intake and fuel injection back-on - I figured I'd pressure test the system to make sure everything is cool first.

From memory (when I changed a hose a couple years ago) - part of the procedure to refill the cooling system was to allow an electric pump to circulate fluid. This suggests I need to turn-on the ignition.

This just sounds like a bad idea - will it unleash the BMW demons and set all kinds of "conditions" in memory because it cannot see ANY of the sensors which are disconnected?


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