Code diagnostics time

1993 F150, 4.9L E4OD trans
I've been having injector trouble since I replaced my motor.  I knew several aspects of what was going on and adjusted it accordingly.   Replaced the injectors I got from Curtis and reset the computer, ran much better since then.  Unfortunately now I'm no longer sure what's going on, but while at the Challenge I finally opened the code reader I had ordered the week before.

I replaced pretty much all the sensors already, the one I didn't was the O2 sensor and now I am kind of wondering if the O2 sensor has been damaged by excessive oil consumption from a faulty valve seal install on the cylinder head?

Codes 173, and 179 popped up
173 - O2 Sensor Not Switching, Too Rich, you can smell it a bit
179 - Fuel System Rich at Part Throttle

Check your plugs and make sure they are all firing properly. The EEC is out of adaptive fuel it can give for the lean condition you have.

If it says its rich, and it smells rich, the o2 sendors are telling you the truth.  There's not a ton of stuff that makes things rich.  Fuel pressure too high, stuck open purge valve, wrong injectors, maf or map reporting wrong, leaky fuel pressure regulator.

Streetwiseguy said:

If it says its rich, and it smells rich, the o2 sendors are telling you the truth.  There's not a ton of stuff that makes things rich.  Fuel pressure too high, stuck open purge valve, wrong injectors, maf or map reporting wrong, leaky fuel pressure regulator.

So I've been poking at this.

I don't have a purge valve.  I've never had one.  Any way to know which engine options had it?  I know that my setup is semi-unique in that it is one of the few EFI heads to not have A.I.R. injection ports, maybe something similar going on?

Is it possible that it's getting an incorrect temp signal?  I've had coolant temp senders that indicated super low below-zero temps which threw the car into a massive cold enrichment that the system couldn't or wouldn't compensate for.

Changing the injectors fixed the previous codes.  Now I have a code 121, which is the TPS sensor being too low or too high at closed throttle.

Test resistance, chuck the TPS if it looks weird?  Is it 0-5V?