This is an update to previous post. I still have not found other end for this wire. I have looked as closely as possible beneath the intake manifold no joy.

Car has LH Jettronics 2.2 system.

My Hayes manual gives two possible uses for this two wire bundle

1. "test instrument pick up point" as part of O2 sensor feedback system. This seems most likely to me and was mentions by the responder to my original post.

2. Made to connect with "thermo-time" switch. I believe this is just used with earlier (1982) models.

Any other thoughts by members of the board.

I don't really know why I am bothered by this since car start and performs flawlessly (for 290K miles). This 1985 245 gets City/Highway 24mpg and 27mpg at 70mph on freeway.

At this point I will just leave the connector loose and follow the not broken don't fix it maxim.