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#16
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update
I really doubt anybody will read through this whole thing, but if so:
I tried disconnecting the vacuum hose to the tranny and took it for a spin. The shifts seemed a little more sloppy/slappy/harsh. It WOULD downshift into third when I told it to, i.e. coasting and dropping the lever. But it would NOT downshift into second unless I pushed on the old pedal. Regardless of whether the hose was connected or not, If I start out in 2, it will not up shift into 2 until I throw it into 3. If I immediately downshift back into 2, it will stay in 2. I don't know if this is related at all, but it's info.
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B - 1983 300SD |
#17
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Just for the hell of it, attempt to take up some slack in the Bowden cable. Turn the plastic piece two or three turns and reinsert it. Drive it again and see if the additonal tension in the cable makes any difference.
Remember, when you press on the pedal and the transmission behaves, the cable is moving.............. |
#18
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Quote:
If the transmission seems to work "fine" without the vacuum, what is the point of the vacuum? I guess it does smooth my shift out. Would it be bad to run the transmission without vacuum? I'm thinking of if I do happen to be in the mountains and I really want to be able to downshift, I could yank the vacuum. Hopefully I'll have it fixed before that occurs.
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B - 1983 300SD |
#19
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This is rather strange. The vacuum will typically slow the onset of the shift, and thereby "soften it". But, for it to delay or prevent a downshift is certainly unique. |
#20
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Quote:
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B - 1983 300SD |
#21
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I'm curious as to the vacuum at idle and at about 1/2 pedal, and at full pedal. |
#22
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B - 1983 300SD |
#23
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You know, I just thought of something. At some point in time, don't remember when, I disonnected all the EGR stuff. I know it shouldn't, but I wonder if that had an affect at all.
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B - 1983 300SD |
#24
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Quote:
I have all lines disconnected and removed from the black box and the SD shifts perfectly. Note, however, that I reduced transmission vacuum at idle from 12" down to 8". I'm right at the edge of clunking on downshifts........in fact.........I'll get a downshift clunk when the transmission is cold. But, all the upshifts are firm but not harsh. |
#25
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If you don't have one.........by now..........I'd be surprised........... |
#26
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Quote:
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B - 1983 300SD |
#27
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Quote:
You're not getting any pressure to the ALDA..........or..........less likely.........the turbo is not making any boost. .......banjo bolt.......line to overboost valve.......overboost valve itself........line to ALDA.........banjo bolt at ALDA...........all must be thoroughly cleaned or replaced. I got a cheap G-tech Pro on e-bay and will accurately check the SD soon. I'm thinking it will be in the 14 second range. |
#28
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Quote:
Edit: Also, adjusting the ALDA does have an effect. I did turn it down a little becuase I'd rather have less smoke than a barely perceptable increase in acceleration. Perhaps I have it at the sweet spot right now, or perhaps I should go adjusting away again and see if I can pump up my times, but I don't think so.
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B - 1983 300SD Last edited by bbeardb; 04-05-2006 at 01:28 PM. |
#29
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Tran maintenance
Relative to more recent MB products, re, '97 C280. Have 200 K miles on my Benz and dealer along with owners manual advises that trans fluid no longer needs to be changed. Forever. Never. My experience, trans works as good as when vehicle was new! Go figure. Comments?
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#30
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Quote:
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B - 1983 300SD |
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