i had the same exact problem with my 1989 190e witch is the exact same car.... here is a cheap and easy way...that car is befor the obd sensor so go to pep boys with 20 dollars ask for a gm universal coil replace your old one with the gm......... and presso it will start and replace the crank sensor which is underneath the oil filter get one from the junk yard and test it with an oms metter it must read .700 or higher .... replace it and badda bing badda bomb the **** will start TRUST ME!!!
GM HELPING THE MERCEDES WORLD RUN!!!!!!!!!!!!!!!!