While in gear, sitting at a stop, my 89 300TE has a bit of a low idle, which makes for a bit of shaking. I've seen in the "E Class owner's Bible" that there is apparently a fix which is supposed to raise the rpms by 50 on cars up to 8/30/90. It involves removing the violet wire from connector 26/3 and grounding it. The bible does not show one where this connector is. I haven't been able to find it in the shop manual either. A search in the archives on this site haven't shown me anything I could use.
Does anyone know where this connector is?
TIA
Andrew

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Fourings

84 Audi Coupe GT with Turbo engine, EFI (buh-bye CIS), Jamex seats, Koni's/H&R's, e-code lights. 210k and counting.
1992 Anthracite 400E, 161k, "Grey Ghost".
1986 VW Quantum Syncro, 192k, gone to the crusher in the sky.
1989 300TE 172k. (Was mine, now also Mom's car)
72 280SE 4.5 (Mom's car)