I know this must be one of the most persistent posts in the forum, but after reading all the posts, I would be very pleased if anyone could clarify this point:
The famous R16/1 resistor seems to be present in some M102 and M103 engines at least. It is said to make wonders to the performance of the engine provided that good fuel is used as it modifies spark timing.
Does anyone know if it exists in W201 (190) european cars or only in american cars? (due to the difference in fuel quality) I have a 1992 190E 2.3 (8v) from Belgium and the only thing I have found is a kind of dial behind the battery with numbers 1 to 7. It must be R17 (that has the function of correcting some warm-up problems, if my information is good). There is also another dial with pos "S" and "N" near the EZL unit. Was R16 resistor substituted by this or they are different things?

If it exists, does anyone know how to locate it in this car? (please, european customers).

Thanks!