MC intake manifold + ABS

[Eyvind Spangen]

When replacing some hoses on my '90 200TQ today, I found this small
tube going from the space between the injectors and the intake
manifold and ending in a small pipe between the air cleaner housing
and the intake manifold. It just goes from one side of the manifold to
the other, it is not connected to anything. What is this?

Now to the ABS: Is the on/off switch supposed to have 4, 5 or 6 wires
connected? The switch has got 6 connectors, but the harness has got 4
or 5 wires to the switch, and two wires continuing to something else.
I wonder because the whole harness looks a bit "hacked" by monkey
lads/PO..

BTW: I discovered that somebody had connected the cold start valve
directly to the starter.. I fixed it, but kept wondering how anyone
could do such a hack.. :-)

-- 
Regards,
ES