Well, as my car has a manual transmission, I just looked at your 3-position video 😉, congratulating myself not to have to worry about THAT solenoid, since I spent 3 weeks in December trying to get the hang of the CSV and CSS solenoids (and TTS, WRD etc.) on account of a difficult cold start situation
But... looking at your other videos, I was fascinated by the simplicity and power of the split-linkage test for lean/rich fuel mixture. What a clever idea. And another great video. Thank you for posting this too.