Interesting. I have never seen one with 50ma, but looking in the 1991 TDM there is a cool chart giving variouscurrent enrichment factors. the chart is in gp 07.3 and is called Electric Test Values CIS-E Injection System. Strangely, I can't find a 102.983 motor, but there are two 102 motors that run at 50ma and another at 60. There are quite a few that run at 10ma, but the large majority run at 20ma.
I had never seen that chart before, thanks for pointing out the data. This value and the others on the chart are extremely valuable in making some precise quick judgements, I'll be back there often.
Bosch Master, ASE Master, L1
33 years MB technician