wondering if any one can help, i have just changed they engine in my 155 but now it wont start. their is a spark and their is fuel their its also got the orginal ecu. the key code on the dash goes out when i try to start her, so i am thinking its not the immobiliser. has anyone got any ideas what it could be or encounterd the same problem?

cheers rich

have you connected the phase sensor and the crank sensor?

yeah everythings connected jus checked all the sensors again to make sure nothings fell off. their all connected but still wont fire up what else could i try ?