Got a weird problem. When my 1942 Gray Market 500SEL is well warmed up and idling...you open a door, either side, the idle speed goes up noticeably. Does not make sense to me at all. I can sit there and push the door button switches in and the idle returns to normal...what could be the cause?

I think you mean 82 SEL?

Sounds like some sort of vacumn leak
Odd...

Hope you can source it...

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83 500 SEC Euro 198K

I thought that, but cannot find any connection from the door to any vacuum system, that could effect engine Idle. My local MB mechanic of 30 years has not heard of it either.
This is my first Mercedes I love the car drives great, fast and solid as a brick.

My other problems I am working on.

No radio, cruise control id off for rebuild, and the most important..the ABS does not work, not really sure where to start there pretty expensive to just have the dealership work on that..the ABS controller thru them is $2k

Speaking of the ABS Controller. I have a 560SEL 1991 with a non-functioning ABS Controller. (long story) What is the safety effect of this? I can't tell any difference driving and braking, but am concerned about driving it until I can get if fixed.... to a repair shop.

Thanks...

When the ABS light comes on that means the ABS is OFF, you are back to standard braking.

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From what the MB mechanic says...When the ABS system does not work you are back to regular brake system, not much of a problem unless you live where is snows, rains, or otherwise you might need to make a panic stop. Cost of repair is high. I have been told that a new controller is $2k a used one can be readily found, but I also have been told that whoever is selling the used one has had to remove the unit from the donor vehicle in a very defined MB way, or the unit is junk. Not sure what to do as I have been told this is true of some part numbers and not true of others.

You aren't going to believe this...my boyfriend took the ABS controller off by mistake. The part number is nearly identical to the cruise control amp, and it was the only unit in the location where the cc amp was supposed to be. It was mailed to the lab for rebuilding cc amps. Of course the lab went...what is this? when it arrived.....sigh. Upon closer look the 1st digits of the part number was off a bit between the two. In the mean time while the ABS Controller was making its was West via UPS, a major service...oil change, fuel injectors, trans flush, idler arm replaced, alignment and rotation, blah blah blah was done on my MB. Boyfriend drove the SEL to work today to 'check it out' before a 6 hour 'turkey day' drive across state tomorrow. The lab e-mailed today that a 'controller' not the cc AMP was in the shoe box I sent. As I type we are trying to find the 'real' cc AMP in the vehicle and cannot. It isn't where MB dealer says it is supposed to be, or anywhere visible. We are hoping it is under the battery casing, which is somewhat 'welded' down from age. It is only fair that you all get a good laugh at the do it yourself faux pax. We can all learn from each other.
Standard braking isn't as safe as the ABS design.

On the cost of an ABS Controller: www.germanimportedparts.com has the unit for a price of "$649.00" 560SEL '91. I jumped on that search immediately to get an amount to insure it for the return of mine from the cc lab. It does not say 'used' in the description but states the 'list' price is $2,400.00. The controller price might vary a lot based upon year and model,...but if it is simply the controller you need to replace check out the site. They are really easy to take off...and on, if you want me to tell you how. ha ha! TOO easy it seems. Good luck and thanks.

On a W126 the ABS control unit is under the hood, behind the cowl, to the left (as you are standing in front of the car) and in front of the Windshield wiper motor/transmission area.

okay thanks,...might as well look for the cc amp there,.. too. It looks like it would be easy to find, shape and all.
Regarding the ABS controller. On my year and model the part has a very sturdy large double bank/row of points/pins (head) that simply slide in and out to link up. Like male computer cable heads for printers. I am thinking it might ruin if you were a bit rough with it, but otherwise...why should it be so touchy. Car is turned off. I remember thinking, wow this part looks really new. (Bosch 0055452132) I'll let you know here on this thread if it is toast when we get it back and re-install it. Hope I didn't break the rules providing a source for controllers... ...just dawned on me.
Back to the amp 'hunt'....

The cruise control amp is normally located below and behind the instrument cluster.