Did I fix the high idle? Well yeah in a way.... My engine still wouldn't stop using water. Went from not very much to about 2L every 75 miles.

So I did what I should have done in the first place... Throw a 5.6 in there.
Hey presto... Nice low ~700 idle.
I retained the upper intake manifold and all of the original FI, but used the 5.6 lower intake and throttle body. I can only guess that I must have damaged the throttle plate originally when cleaning the crap out.

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Ben

'85 500 SEL
'85 928S2
'88 560 SEC
'90 750i