First, let me say the 1985s are the most complicated and vacuum (emmssion)
control laden of all the W123 diesels, and I don't know precisely how
everything works exactly, but-
The photo (63) -the red circeld bit should have a "Y" that on one end has
the small black tube that leads into the firewall, and one going the other
way to join other vac lines that travel to the other ide of the motor, this
is all for system vacuum venting.
There should not tbe two small black lines going into the firewall, (usually
anyway, up to 1984 models I'm sure) one of the small black lines should go
to the transmission modulator.
It's possible you pulled that too, thus the rough shifting. The large, hard
plastic fixed line from the vac pump to the booster is the main supply for
all the car's needed system vacuum, the most important being the brake
booster. All other vacuum taps off this. The 1985 turbos have three
additional vacuum system controls (and minus 2 others) not found on the
pre-'85s. (US turbos) The transmission modulator line should come off the
blue vacuum valve control mounted by the driver hood hinge compartment.
How is the brown wire to the shuf-off valve I mentioned? Sounds like you
really need a hand vac pump to check for vacuum pump operation (in case of
coincidental failure) fuel shut-off valve operation, and vacuum modulator
pressure retention. There really should be something obviously unplugged,
unless you plugged up the lines wrong or the pump failed, since you now have
two major symptoms. On e can also check the ignition vac control operation
from supply to fuel shut-off valve by applying the hand tester to the brown
supply line off the main line (that goes into the firewall) and checking
the operation with the key in both positions. (This avoids having to pull
the kick panel) To isolate the fuel shut off valve itself, simply hook
your pump into that and test, which it's behavoir will indicate how sealed
it is.
I hope that clairfies, there isn't much else I can say without messing
around with the car myself.
Vince
www.club123d.org
From: Jason Greene <[EMAIL PROTECTED]>
Reply-To: Mercedes Discussion List <[EMAIL PROTECTED]>
To: Mercedes Discussion List <[EMAIL PROTECTED]>
Subject: Re: [MBZ] vacume leak/no engine stop
Date: Sun, 01 Jan 2006 16:23:24 -0600
So there are 2 lines that go into the cabin? A small black line
http://www.pictureblogger.com/Mercedes/dscn0982
and this small black line is supposed to attach to that white thing on the
IP?
And a larger black line that does the same thing but connects to a juction
where several lines attache?
Sorry, Just want to be sure.
And if this is the case... why won't my car turn off?
Another thing I noticed at the same time was the trany is now shifting
really hard. It never did this
This s an 85 123 with 80K miles
Jason
Jim Cathey wrote:
>>So we know what the larger black line is (clean air intake) but what is
>>the smaller black line?
>>
>>
>
>Vent line. Bleeds off vacuum by sucking clean(er) cabin air.
>Not your problem, in other words.
>
>-- Jim
>
>
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