Motor wiring swap
Hello All!
Presently undertaking a swap from a 3.1L in a '90 Firebird to a '89 GTA lined out 5.7L. We have the engine bay wiring harness, the computer, and all the sensors from the '89. Can't track down a schematic/diagram for the bulkhead connector fuse block for the '89 or the '90. I know that there is something different between the two years. Splicing or moving the wires within the harness is not a big deal, just need to find a diagram to see what needs to go where. Any help or direction of where to search would be greatly appreciated. Thanks ahead of time.
Jon B.
'89 GTA (donor)
'90 Firebird (receiptiant)
Hello All!
Presently undertaking a swap from a 3.1L in a '90 Firebird to a '89 GTA lined out 5.7L. We have the engine bay wiring harness, the computer, and all the sensors from the '89. Can't track down a schematic/diagram for the bulkhead connector fuse block for the '89 or the '90. I know that there is something different between the two years. Splicing or moving the wires within the harness is not a big deal, just need to find a diagram to see what needs to go where. Any help or direction of where to search would be greatly appreciated. Thanks ahead of time.
Jon B.
'89 GTA (donor)
'90 Firebird (receiptiant)
five7kid
Moderator
close
Mar 29, 2026
Typical advice is to get the factory shop manuals. But, if nothing else, this reply will move it back to top and perhaps attract someone's attention that knows the answer.