A danger with some of the (earlier?) Bosch F.I. systems is that by 
     opening the throttle body (depressing the accelerator pedal), you 
     expose the "vane" in the "air flow box" to damage from backfires.  A 
     backfire can blow the vane right off its pivots which usually requires 
     a replacement.
     
     Is this still a concern with the Digi-series of F.I. systems?
     
     -Blaine (STILL no owner's manuals)