think FAST

F- are you getting FUEL? disconnect the fuel line connecting to the fuel rail, crank the engine, if fuel comes out, then your fuel pump is probably ok. OR you could check fuel flow at the injectors by pulling them and watching for the spray.

A- are you getting Air? is the air filter clogged?

S- are you getting Spark? use a $5 spark tester to check for spark.

T- is the Timing set properly? check for proper operation of the crank position sensor or something related to timing.

Your no start problem is one of those.

__________________
Ben
1987 190d 2.5Turbo