hi.i have astravan 99 1.7 td.engine is dead.i try to fit isuzu engine from 02 astravan,and there is some differents,turbo is on the front not on the back like in old engine,so i replace exhaust,and wirings are different,so i change all wires and ecu with new engine,change ignition lock and immobiliser.but its not start.can anybody help,what else i need to replace,from donnor 02 astravan?