might it have something to do with the whole "clutch has to be depressed" issue? Is there some sensor that's supposed to send a message to the ECU allowing the car to start?
I don't know, just throwing ideas out there.
'86 325es (TURTL3): PJ peetsa hawler
'87 535is (BADWATER): almost done... really.
'86 325e (GRN HLL): DD/show/rocket
'04 x3 3.0i: Wife's Bimmer (manual, woot!) My BMW Blog