With the detonation, sounds like maybe some sort of crossfire issue. Is it possible you swapped-up the 1-2 coil connections or 1-2 injectors? Or if not, have you checked the harnesses for possible shorts between cylinders?
As stated above check the 1 and 2 , and 3 and 4 coil harness. It's very easy to get 3 and 4 reversed. I ran into that issue. If I tried to start it, it would back fire very loud, or run extremely rich.
If that is the issue, Mark the coils with a permanent marker. Also, check your timing and coils.
NICOclub's Nissan forums and Infiniti forums and all affiliated sites are the property of HDS Holdings, Inc.
They are independent publications and are not affiliated with or endorsed by Nissan or Infiniti.