MDC, what was the fix??
Can't really tell what's going on there. What is that electrical tape harness running down the side of the ECU? Is that supposed to be the dash side harness for the Mk2? The problem I see is that you cut the black with red stripe wires in the Mk3 engine harness. That wire is the switched side of the EFI main relay. In the Mk3 that enters the harness at the C1 connector which is over by the fuse box in the Mk3 and the ECU is the end of the line. It runs thru the harness and powers a bunch of things and enters the ECU. It looks like mainly ISC, diagnostic +B, 02 sensor, and a couple of VSVs. Doing what you did effectively cut the extension cord and bypassed everything. The black with yellow should be connected to EFI fuse and black with orange runs to the coil side of the EFI main relay