id guess the connections are fubarred or you messed up with the oil drain back vacumm tube under the intake. Id bet on the electrical section.
Go over it close, the injector plugins and the coil packs. You did disconnect the battery cable right? maybe you cracked the fusable link?
Something stupid is wrong, you'll figure it out, and post if you did or didnt.
Good luck.
95 E34 530I V2.37
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Those who make peaceful revolution impossible will make violent revolution inevitable.
John F. Kennedy