The ETA in the video is for an ASR car (EA/CC/ISC). I've never tested an ETA without ASR (CC/ISC), so I really wouldn't know what to look for. I don't think you would see the movement of the butterfly with the stepper motor as is demonstrated in the video because that's part of the EA. On a positive note, non-ASR cars typically have less problems with the ETA, so maybe your ETA is okay.

You may want to try posting on *********.com. There are at least two MB techs of 30+ years that frequent the board and they might be able to impart some of their knowledge. In addition, even some of the non-MB tech members are awesome (GVZ. GSXR, etc.). Just don't say anything about using Uro parts.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles