Sorry for the terminology, I am just happy that someone is seeing some results from exploring the rehab options available with the CIS FD which has previously been considered an 'untouchable' system. As mentioned, I found this post from a search based on a suspicion that there may be more options to rejuvenate these units than had been previously published.

I am not even certain, at this point, that this is my problem. From searching here for a few weeks though, it definitely points to the FD as a major suspect (1993 SL with 90K miles which appears to have mostly sat since 2005 and now blows black smoke out the exhaust). I have a new temp sensor which I will install first. If that makes enough difference to render the car drivable, I will mix 50/50 Seafoam and give it the proverbial 100 mile Italian tuneup.

I cynically suspect, though, that the end solution will be through the FD and I now see that the FD must be removed to extend the control plunger beyond its installed range of travel. That is no problem as soon I can get a weekend off work without being iced in at home (which has been the story so far this year....)

I do have one final question; is the Yamaha carb cleaner you mention the stuff offered by Amazon (Yamaha Carburetor Cleaner Dip 32oz ACC-CARBC-LE-NR) or the stuff available from boat dealers as ACC-CARBC-LE-NR? The abbreviation is the same but they are in differently-pictured bottles.

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1988 300E
1993 300SL
1994 540i

If I have a problem with my Mercedes, I go to MercedesShop. If I have a problem with my BMW, I go to BimmerNut.
If I have a probem with my Dell, I reboot it. I was an engineer for them for 10 years and we blamed everything on Microsoft.