Probably two separate issues. I had a similar problem with the
shutoff on OM603. I could shut off the engine ok with the mightyvac,
but it would not shut down with the engine vacuum, exactly as you
describe. I chased that for a long time, but it was cured when i put
in a new vac shutoff.
The trans would be a symptom of excessive vacuum pressure, not low
pressure. However that is a separate problem that I will let others
address, or refer you to sunvalley mercedes recyclers website, where
there are good troubleshooting tips.
Probably a leak in the lines somewhere? Bad fitting? Bad valve?
Vac issues can be annoying.
--R
On 1/13/13 12:11 PM, Danny Goldberg wrote:
Car my son uses to commute about 100 miles a day is a 1993, W124
with 227K on clock but about 176K on transplanted power train.
(Engine & trany - power train was re-done in 2004 with 141K on Car
and 90K on power train). Car has run well until now (exception
being annoying oil leak) with basic standard maintenance using M1
etc at required intervals.
Of late it seems to have developed vacuum issues.
Engine shut off did not work properly. Diagnosis with a MitiVac
showed slow leak from shut off valve, which was then replaced with
part from the parts engine, which holds vac perfectly. However this
did not solve issue. When the switch is shut off, the valve kicks
in, vacuum from the line from the switch holds at 22. Problem is
the valve as mounted on the IP does not have enough "pull" to shut
off engine completely! It slows the RPM but i still need to
manually push the "shut off lever" the last little bit to get the
engine to stop. (it's almost as if the shut off valve is fighting
something that will not give the last little bit without outside
help.)
At the same time the car shifts a bit poorly. It goes through the
lower shifts from a stand still OK, but, between 3 and 4th at 4000
RPM or higher you need to take your foot of the accelerator to fool
it into that last shift. Other than that there is no slippage or
irregularity in the shift.
With car running at idle the Miti Vac reads about 18 to just under 20.
Ideas on what to look at next?
As always thanks!
danny goldberg
68 200d 126k my toy
85 300d 170K (spare car)
90 300d 142K daily driver
91 300d 392K miles, (parts car)
96 Subaru Legacy 113K (wife's car)
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