i swap complete engine with harness + tranny + ecu from 97 integra Ls and i dropped in to 96 gsr,
do i need to change any wires?
there is extra plug on passenger side on the gsr that ls harness does not have.

i know when you swap the gsr in to the ls you need add extra wire, but when you go the other way every think should be ok.

Ls engine was running fine before i removed from the car, and now i am getting code 54.

did any body come accros some think like that? plz let me know.