jt20,
IF your vacuum "reaches 0 inHg close to 3/4 throttle" this could be caused by either:
(a) the orifice size you have in the vacuum line coming off the main vacuum pump -to- brake booster vacuum supply line,... this orifice is too small... or
(b) the VCV needs to be adjusted

My belief is that you should first change the orifice size and in your case make it larger by one or two sizes. This allows the pump to draw a stronger vacuum from the tranny-shifter system and this means the VCV will NOT bleed off as much the vacuum being seen by the tranny's vacuum modulator valve. Remember this vacuum control system is very "dynamic" with air flowing through it primarily because the VCV purposely allows air into it in order to do it's job of modulating the vacuum seen by the tranny's vacuum-to-hydraulic modulating valve!

The other alternative to adjust the VCV is a bit more abstract and thus tricky!

Regards,

You have a unique combination of a vac amp coupled with the VCV on a 617. That's the only year where it exists.

The effect that you got was much greater than what we usually get with the 603's using similar adjustments.

Glad it worked for you.

BTW, you might want to disregard the irrelevant posts on this thread..........

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When I was trouble shooting my problems, I spent a long time reading all the posts in this thread. I found very few that were irrelevant. It's one of the best threads on the forum. It was confusing however and it would help others if there was someway to sort this into multilple threads by model number: 617, 603, etc.

__________________
Charles
1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/mercedes-benz-cars-sale/296386-fs-1-owner-83-mb-300d-turbo-rebuild-parts.html

Thanks Charles for trying to get this THREAD back on track and away from the "Politics of Personal Powa" by some! When I started this THREAD I did not contemplate such a need as you now propose... but later I did. This is why you will see the following title emblazoned at the top of POST #1 for as the author of that POST, I am able to go back and edit it to reflect such "after-the-fact" intent. Here is the title I inserted:
However in retrospect, maybe I should revise this title and thus my intent to include W123 only for the W126 Tranny-Shifter systems are largely the more complicated ones. Maybe I should change it to read W123 "Diesels" from 1977 to 1981... or 1982.
Thanks professor Charles! I vote to award you the President John Adams award!
Now IF we can get a clear explanation of how the spell-checker works for us here on this FORUM. Anyone who knows how to do this, please let us know!!
Regards

[1] I would like this THREAD to be a “acrimony-free” zone… where personal attacks are either not allowed or are openly discouraged…and where opinions given in the spirit of “ IMHO ” give us free license to agree to disagree… where participants who snipe at one another are discouraged by others.

[2] Because of this THREAD’s unexpected popularity and now large size I intend to use my current authority as the originator of this THREAD’s #1 POST to create/insert and maintain a “quasi-table of contents” (TOC) within this THREAD. I see this TOC using http link addresses that will readily take the reader to the start of groups of POSTs within this THREAD or to other THREADs that are the subject of each line entry in the TOC.

In the spirit of the above expressed intent, of course I am open to OFF-THREAD/FORUM ideas from any of you wanting to share YOUR ideas as to how best design/craft such intent or your completely different ideas as well ! I would really like to hear your ideas as to how best to make the POSTs within this THREAD easier to follow... for e.g. as to how best have POSTers indicat what earlier POST they are directly responding to. All too often we fail to think of this simple, but important, step!

Regards,

Folks,

Well, after some weather delays, I have adjusted the transmission modulator with the result that my login 'Rocketman' now makes sense as my old 300D is now a rocket. I now accelerate with authority and even downshift when going up a hill.

Between overhauling the vacuum system, setting the vacuum range properly and adjusting the modulator, the advice I received on this site has been just what the doctor ordered.

Lead on!

So, did you take the recommended advice and adjust the modulator by three turns clockwise?

Did that eliminate the flare on the 2-3?

Congradulations Rocketman and thanks for reporting back the success of your project. You succeeded because of your attention to detail and you had enough tenacity to browse this now VERY LARGE THREAD for the information you needed. My hope now is to make this THREAD more user friendly with my "TOC" and/or index I posted above… and possibly to even spin off a “Wiki” that people can access and use!
Regards

BC,

The modulator on my machine turned out to be a little more sensitive that you expected. I ended up with about 1 turn CW to dial it in where it needed to be. I say about 1 because I dropped the d&5# key during the process and had to make my best guess as to its position before it fell.

Thanks for your input.

Thanks for the info. I need the feedback to help others in the same situation.

Did the modulator adjustment eliminate all flaring?

[COLOR=darkorange]

Sam,
You are right it is very hard to respond directly to an older post without confusing readers and more often than not it keeps me from responding all together. I have found it to be confusioning when I am deeply engrossed in a meaty techincal post, only to be sidetracked by "posts" replying to older posts that were written 1, 2, maybe 4 pages back. (although I always come round to appreciate the effort and information contained in 99% of those posts)

Perhaps one way to make it easier to follow posts within this thread would be to color code your initial posts, using the same color any copy and pasted quotes you use within that same and following posts and anyone responding would also use the same color. One other thought is to always attach a title to each new post and following posts that includes pertinant information (year, model, engine model etc.). This could be accomplished if we completed a signature line. Perhaps the forum could make this a registration requirement.

I wholeheartedly agree with your insistance on knowing the model number of the transmission and engine model when starting off with problem solving. It is time saving. Maybe that should be the header of each post, the year model # engine# trans# and an attachment picture of the engine compartment.

Sam, thank you for all of your hard work and the countless hours you and everyone that adds to this amazing forum. I have learned so much from you all. As a result, I repair and maintain my little 240D all by myself. I am a 43 year old woman with three teenagers! I have always loved old cars and motorcycles...(own quite a few) and I love helping my Benz live alittle longer and go alittle bit faster.

Loose the orange text!

__________________
1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.

I think color coding will add to the confusion. Just a simple header with vehicle identification is probably the best.

I appreciate those that do their homework and reply to an old post rather than starting a new thread. The questions are mostly answered if you use the Google search thread. If not, do a reply to the old post with the best information available.

__________________
Charles
1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/showthread.php?t=296386

Tracey... I'm just funning you with the " hot pink/purple/Fuchsia " text above! Congradulations YOUNG lady for caring enough about your 240D to do your own DIYer wrenching! Also thanks for the compliments I think were sent my way. I'm fortunate to be able to type at ~100wpm but even at that I'm often torn between wanting to write more on this FORUM and wanting to get my hands into another project. I'm also fortunate to have an INDY shop MB mechanic who is now a good friend and we have partnered on what he considers "high-tech" stuff... like:
(a) a timing light system for our loveable diesels... and now
(b) a CP9150/9145 OBDII scanner.
I now almost always have my digital camera with me when I work on a car... and use it to document things just in case I find later that there is something worth writing about. I still plan on further improvements to this THREAD... things to make it easier for those who end up here and stay a while!
Regards,