I just bought a 383 GM performance motor from a fellow rockcrawler. Ran great in his rig but he needed the LS?
After the swap runs rich once in closed loop. Replaced all sensors. No change. Replaced O2 sensors. No change.
No vacuum leaks.
Only running bank 1 sensor per bank.
Bought a this scanner. O2 voltage looks normal in both banks until closed loop the. Bank 1 high (.9) and bank 2 low (.05). Once in closed loop black smoke.
No codes.
Unplugged O2 sensors and it runs fine.
It ran fine until we pull led and reinstalled in my rig.
I have read about all I can find about this and I?m stumped.
Any thoughts?
Thanks! J