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Date registered: Feb 2015
Vehicle: 1989 300SE (Mitzi); 2003 CLK 430 cabrio (Clifford)
Location: Southern California, USA
Mentioned: 4 Post(s)
Quoted: 133 Post(s)
To those who are following this thread, I finally got around to doing a more thorough diagnosis once the car had been sitting for a month, as the idle problem always followed such periods; once the car had been running for several hours, it would generally start and run pretty well—until it sat for another week or three.
Turns out that my distributor cap, only about two years old, developed serious corrosion at the far right lower terminal (looking at it from the front of the car), and the plug wire connector deteriorated with it. How it was connecting at all is beyond me, and how this happens is also a bit of a mystery.
Question is: Which distributor cap to buy: Bosch. Beru. Or "genuine Mercedes-Benz"—which I assume is made by either of the first two. I'm also going to replace the O-ring, dust seal and all plug wires as well.
Anything else I should replace while I'm at it? I'm pretty sure the rotor's going to be in good shape. I'm having trouble getting at the bottom cap screw as it's in a very awkward spot; I need to get a better tool.
Thanks. And happy holidays to you all.