It's been a week now and none of my problems have returned and no stuck high idle. I'm calling the recap of the EDS board a success.

For those folks out there who need a photo, I pulled the EDS module out and took some quick shots to reinforce what I said earlier in this thread.

Photo 1: When you pull the EDS computer, make sure you note which way the latching clip (red arrow) faces. The boards inside can go back into the plastic box either direction, but if you get it backwards during reassembly, you won't be able to reattach the wiring harness since it'll be "upside down".

Photo 2: Once you remove the 4 screws that hold the module together, pull the boards out of the plastic box and arrange as shown with the latching clip (blue arrow) at the top right. Remove the 2 screws (red arrows), and squeeze the 2 plastic clips (purple arrows) to release the boards.

Photo 3: At the bottom end of the board pair, you have 2 plastic clips. Separate them at the bulges (red arrows). They should pop apart with a small effort. At this point you should be able to fully separate the boards and lay them open like a book.

Photo 4: With the boards laid open, you will see the 5 electrolytic capacitors you need to replace. They are marked with their values, but they are also given here for reference. I used 63V capacitors for all of my replacements because they were the easiest (and cheapest) to find.

These boards are double-sided circuit traces, so take your time de-soldering. If you get impatient and start ripping and tearing, you can destroy the circuit card. You may need to wick the solder out of the hole, then use the soldering iron to maneuver the old leads out of the holes.

The polarity of the capacitors is marked on the silkscreen of the circuit card. The positive end of each capacitor is marked with a "+" symbol. The capacitor itself will have the negative end marked, usually with a white stripe or with a series of "-" symbols.

As is usually the case, reassembly is the reverse process of disassembly.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]