Update! So after installing 2 different ECU they both dont work. So we had a freind bring up his same model car 96' C280 and we tried both ECU that we bought off selvage yard and they both failed to start our friends car. Now we are forced to and might have t purchase a new ECU thru mercedes which cost $1400!!!!!! Now my dad went to ur friends car and took out a little black box under the passenger floor and put that in our car. So now our car has spark. So other then a new ECU what is that little black box called under the passenger floor next to the RCL box? but yes we still have a long way to go before we an get it starrted..