not sure if your car has one, but possibly the ignition control module or ezl if you have one...

my car did same thing but mine is a 92 and has an ezl for sure, eded up going bad, and hence no spark...

if you have one would probably be mounted on drivers fender...

not sure if 85 used them but is possible

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon - Sold
2006 E350 Wagon - 368 - Dead
2015 GL350 Bluetec - 197U