u/Rollyis

Hello I am new to this subreddit but I have recently bought a 2008 Acura tl and I took it apart to replace to oil pump seal and I put it back together at top dead center and now it cranks but does not want to start, it has air,fuel and spark but it's not combusting and I'm not getting a code for the crankshaft position sensor, could I get some help?