There is a spring inside the modulator, I believe. Pushes the operating end out against the vacuum applied.

I don't know what effect applying vacuum to the inside of the tranny would have.....

Anything engine related in a 201 is a pain in the neck -- changed a starter on one once, ended up taking the engine mount out to put it back in, the blasted thing fell right out but I could never get it back in!

Peter

On Sep 12, 2011, at 9:33 PM, Kaleb C. Striplin wrote:

I can't believe I did not check to see if the mod was holding vacuum before installing the trans. Either I didn't or it started leaking after the fact. In any case I believe it's going to be a tight fit getting it out in a 201. So what spring is this? The one in the valve itself or something in the tranny

Sent from my iPhone

On Sep 12, 2011, at 9:12 PM, Peter Frederick <psf...@earthlink.net> wrote:

If it won't hold vac, it's stuck in the full throttle position, and if the spring is broken as well, the modulator valve (which is operated by the modulator) can be out further than normal. Anything could happen, and I'd fix that first. May not cure the problem, but it's not going to work normally with a bad modulator anyway.

Peter


On Sep 12, 2011, at 5:22 PM, Kaleb C. Striplin wrote:

yea, but keep it from shifting at all?

On 9/12/2011 5:07 PM, Peter Frederick wrote:
If the modulator is whacked, it will do all sorts of strange things until you get a working one in there -- if the diaphram is bad and the spring is shot, the shift control valve is moving randomly.

Peter

On Sep 12, 2011, at 5:03 PM, Max Dillon wrote:

Did you disconnect the kick-down switch?

Max
--
Sent from my Android phone with K-9 Mail. Please excuse my brevity.

"Kaleb C. Striplin" <ka...@striplin.net> wrote:

update.

So yesterday I put in some sea foam, shifted thru the gears, tried to drive it but still no upshift, let it run a while during which I shifted
thru the gears with the brake on. Pulled the pan, not much crap in
there, pretty clean actually although I did notice a small little chip of plastic about an 1/8th of an inch long. Changed the filter. Put it back together and took off and it shifted! Drove it a couple of miles, back to the house. Tranny shifts very hard and I have a leak in the acc system, I unhooked that and plugged off to see if it made a different. Went back out, wont upshift again!!!!!!!! I did not even turn the car off. Pulled back in driveway, put that vacuum line back on, back out,
would not shift, back to driveway and back out again. It shifts!!
Drive it a few miles no problem. Get back home, check vacuum system,
VCV on IP working, modulator not holding vacuum. Back in car , it
shifts so I need to replace the modulator. Shut if off. Then put the radio in it for the kid later that evening, started it up, DOES NOT SHIFT again!!! WTF??? I am just about ready to yank the tranny and swap
it out AGAIN. What the heck could be causing this intermittant
problem? Its got to be something sticking in the governor. Its wierd why it started shifting after a filter change but now back to no shift. Also, it seems like it might actually be in 2nd, because if I manually shift it down it drops a gear, then back to D I cant really feel it
shift to 2nd but if I drop it back to low again, it drops back to
first. Could the hard shifting from the modulator be causing it to
stick? I dont see how.

On 9/11/2011 4:18 PM, Curt Raymond wrote:
If you recall back at Christmas 2007 or so I had this EXACT problem with my Dakota. My wife had to drive 10 miles from work to home in 1st gear. I used my topsider to pull about a quart of fluid out and added a quart of Lucas magic transmission fluid which looks/smells/feels like thick ATF. I drove it around in 1st for awhile and left it overnight. The next morning (after tons of doom and gloom posts on here) I drove it around and found if I slipped into neutral at speed it'd shift into 2nd. Then eventually 3rd. Then after awhile 4th and it started acting fairly normal.

After Christmas I had a fluid/filter change and it drove fine for another 20,000 miles.

-Curt

Date: Sat, 10 Sep 2011 16:58:41 -0500
From: "Kaleb C. Striplin"<ka...@striplin.net>
To: Mercedes Discussion List<Mercedes@okiebenz.com>,
davesl...@okiebenz.com
Subject: [MBZ] transmission no upshift
Message-ID:<sig.22343a5fcb.4e6bdd91.5080...@striplin.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Today I hooked my gauge to the operating, regulating (not working or modulator) port and I get no pressure. According to the semi useful ATSG book, that means pull the governor and clean out. I dont see any way of doing this on a 190D without pulling the trans. In fact, I just tried to pull one of a bad trans that was out of the car and I could not do it either. I just could not get a couple of c clip things out I needed to, probably dont have the tools for it. Anyway, I have several spare trannies laying around but before I do a swap for the 3rd time on this car, would some of that trans X or something like that potentially free up the governor? It appears the weights spinning around move a valve in and out, I assume the valve is sticking. I know that trans x might work with a stuck valve in the valve body but was not sure if it
might help this situation. Any other ideas?

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