Replaced my 26 year-old vac connectors, and... - Page 2 - PeachParts Mercedes-Benz Forum

NH82W123 · #16 08-21-2008, 07:45 PM

My indy checked everything over late this afternoon and, after numerous road tests and adjustments, concluded the problem is a bad modulator. It wouldn't hold vacuum when checked with a hand pump.

He had a replacement in stock but not enough time to install and tune the system, so I'll be going back tomorrow. I don't understand how the bad modulator could be linked to my connector replacement, but maybe it's just a coincidence. I'll report back tomorrow... Meanwhile, thanks to all who've replied so far.

Charlie

turbobenz · #17 08-21-2008, 08:09 PM

try running a single line from the vac pipe to the top of the vac tranny modulator using a y connector. Then hook the black vac line from the trans into it. Voila, perfect transmission. Then on a seperate lines hook up the swarm of in-cabin lines and they should all work fine. Is there a tutorial for this, or should I make one on paint?

NH82W123 · #18 08-22-2008, 03:41 PM

My indy replaced the trans modulator today and things are a little better than before: still a harsh 1-2 shift half the time, but the 2-3 flare is reduced considerably and the downshift clunk has lessened, too. He suggested that improving it any further would require a new vacuum control valve, which he said personally he wouldn't bother to do. (He also suggested re-attaching the 3/2 flippers which I removed long ago... this worries me a little given Brian Carlton's proven advice on the issue.)

So, I don't think I'll ever figure out just what went wrong with my connector replacement project in the first place, but the shifting is acceptable to the point that I should probably just leave well enough alone now.

Charlie

NH82W123 · #19 08-22-2008, 03:43 PM

Quote:

Originally Posted by turbobenz

try running a single line from the vac pipe to the top of the vac tranny modulator using a y connector. Then hook the black vac line from the trans into it. Voila, perfect transmission. Then on a seperate lines hook up the swarm of in-cabin lines and they should all work fine. Is there a tutorial for this, or should I make one on paint?

By the way, turbobenz, despite what I said above about leaving it alone, I would be curious to see a tutorial on the line connection you recommend. I've not heard of that approach before.

Thanks,

Charlie