My car is a '92 which has batch fire. My question is with one O2 sensor disconnected will the car still go into a closed loop?

The setup: I have a piggyback controller on my car. To tune it you disconnect the O2's and adjust the fuel map to the desired fuel ratio. When done plug the O2's back in to allow the factory ecm to adjust the fuel ratio. The piggyback modifies the injector signal, so you can add more or less fuel from the factory ecm pulses.

The situation: I have the fuel ratio's close. 14.5 at idle 13's under acceleration and 12.2 at WOT. With this I plugged the O2's back in and it is pulling to the rich side. At an idle it is reading 11, then I get a code 64 which is lean on the right side. The same side my wideband is hooked into.

Anyway tonight I disconnected the right O2, and now I have 14.0 for my idle. Is there a simple way to find out if my right O2 is faulty and reading lean, which would make the ECM want to add fuel. When I am driving the SES light goes away, but the AFR is reading 10.

I have a feeling, but I would need to check the Helm first, that if an O2 sensor codes, it goes into open loop and runs off tables.

Tonight I switched the O2's side for side. This will see if the right bank was lean, or if the O2 that was reading lean would switch the code to the left side. The right had carbon, and the left was clean. These are new 3 wire O2's. I unhooked the heater wire too. After 15 minutes of sitting at an idle there wans't a SES light and the AFR was jumping around 14.7. Last night I had checked the connections and cleared the codes.

While the car was running it did pull itself rich and then back lean as it was learning. When it was running last night it did the same, but kept getting richer. I have reset the codes before trying again.

Although things looked good I am still not 100% convinced. I am still using all of the same parts.

Well no SES light yet, but I still not convinced. The car seemed that it was still running rich. I have true duals, and so I cannot see what the driver side is actually doing. Tomorrow I will pull the O2's to see if if one is still carboned along with the spark plugs.