i guess your talking about an 87 w124
which would probably be a 300e...

so if your car is a gas car then you check for fire and fuel

does the car even attempt to crank.... is there any conbustion


if there is some conbustion it signals that the spark plugs and the electrical system is somewhat working.....

so that would lead you to a fuel problem..... this could be a fuel pump or
clogged fuel filter problem....



so which is it.... is there even the tinnest combustion or no conbustion at all.