Originally posted by frankenclipseRS Ok, so im starting my rebuild.... Can I swap/pinout my stock 97 420A ECU for a 99 black box ECU? Having trouble finding any info, instructions, pros/cons, etc...
A 99 black box ecu is for a 4g63 so no it won't work on a 420a. You need a 420a ecu. If it's different years then you can rewire the pins but it's much easier to just find the same year ecu your car needs.