hi. have just finished replacing camshaft chain and chain tensioner on a 2004 elantra g4 gc engine both timing positions spot on [that is tcd and valve timing] tried to start engine after completing re assembly and would not start [no spark on any cylinder. the only electrical connections unplugged was the vvt solenoid and the cars battery. the battery was disconnected for 10 days does the computor need re programming . or something to that effect. no thing was short circuited or interfered with .