Ok so my wife complains shifting is hard in the 90's wagon. Take it
for a spin, yes it is, thumping into gear.
Fine go out stick vacuum gauge on line after green pot feeding
transmission modulator. No Vacuum. Yup shifting would be hard, on the
other hand that is a good thing.
a) check transmission modulator, that is ok, holds vacuum nicely.
b) check green pot after vacuum controller, fine
c) check rubber connector hoses fine
d) check vacuum at feed before green restriction connector to vacuum
control valve, good
e) check vacuum at feed after green restriction connector. good
f) check vacuum at pipe exiting Mr transmission controller vacuum
regulator (123 300 10 33), NO vacuum.
Vacuum in, no vacuum out.. (or so I think).
Sigh
try to pull vacuum on input side with minvacuum, nope...
Ok well it's 15+ years old, lets get new one.
New one arrives, actually made march 28th 2007 (revised 140 300 08
33 I think).
Well I guess if this is new old stock these things must go faulty
enough to have used up all the old stock.
Stick on car, test for the 385 mbars I need, ZERO? Gawh repeat
steps (a)-(f) same, but with new controller...
Try old controller, same.
Wife at this point lets me know my dinner is being enjoyed by the
German Shepherd and if I actually wander out of the garage I might
be able to lick the plate or something.
Trying hard not to drop bolts into engine pan...
Grrr remove controller swing up to see if I can turn connector on
back, and VACUUM... Huh. Fine, put back in, put bolts on, go to
adjust, NO vacuum.
Huh...
Say things, go check on happy German Shepherd, no dinner for me, back
to garage. undo the nuts, swing it up, VACCUM...
MMMM oh look that less that 2 year old Y connector feeding direct
from vacuum pump, if I let the hoses all settle, mmm no vacuum to
controller, apply a bit of torque on the hoses, why then vacuum.
Oh so EVIL... Put spare 17 year old Y connector back in car, vacuum
vacuum. Hook up to old controler, vacuum. Clamp tongue, pet happy
german shepherd.
Put it all back together, take for spin, nice shifting...
Seems when the hoses were all relaxed, then no vacuum, but when I
moved them to test for vacuum on the connections to the vacuum
controller, then the crack would seal
just enough to show vacuum and mislead me.
Well maybe I'll ebay the old one then, I was thinking of taking it
apart to see what's inside, but it wasn't at fault and alas these
aren't $20 items.
John
1983 300TDt 382k Kilometers (mobil 1 Delvac)
1990's 300TDt 196k Kilometers (mobil 1 Delvac)
1993 500SEL 192k Kilometers (mobil 1 Delvac)
