Turbo Swap, O2 Sensor Ground

[oneowner88lx]

I am swapping an '88 Turbo Coupe engine into an '88 Mustang LX 2.3L. I have been told that Pin 49, orange wire, needs to be grounded to the turbo compressor housing in order for the O2 sensor to work correctly. I have seen stock '88 Mustang 2.3L wiring diagrams with that orange wire as an O2 sensor ground but I do not see that wire under the hood of my car. Do I need to run a new wire from Pin 49 to the compressor housing or is that wire in my stock harness some where already?

[Stinger]

I can't say where your o2 ground wire is, you'll have to figure that out yourself. If you can't trace it from the ecu to its current location, you can run a new wire.

[oneowner88lx]

Stinger, thanks for your prompt response. Your expert opinion is greatly appreciated.

I take it you agree it is important to have the O2 sensor grounded via Pin 49?

This diagram is supposed to be for '88-'90 Mustang 2.3L (click to enlarge):

www.flemworld.com/slug/howto/Images/LXWD.jpg

And this is supposed to be how an '88-'90 wiring should look after the swap (click to enlarge):

www.flemworld.com/slug/howto/Images/MTCWD.JPG

Both diagrams show Pin 49 as an O2 sensor ground but I have not found it under the hood of my '88? I plan to take the kick panel off and see if there is a wire to Pin 49.

[Stinger]

Yes, it is important.

[oneowner88lx]

Thanks. I'll dig in there and figure out where that wire is or run a new one if need be.