You can check & set timing on 1984-86 models with timing light. Basic at idle timing w/o vacuum is 6-10 deg.

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MERCEDES BENZ MASTER GUILD TECHNICIAN (6 TIMES)
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. Shopforeman
190E 2.3 ITS RACECAR
1986 190E 16V