OK so I've done an obd0 to obd1 conversion, running a chipped P28 ECU with conversion harness.

Now I wired up a 4 wire bosch o2 sensor to the pig tail wiring and I believe the wires are all going to the right spot.

Originally I had the signal wire which is black spliced into the ecu harness as well.as the original black wire mounted on the front of the block, my narrowband air fuel Guage was also spliced here.

The car starting bogging and stalling, so I removed the original black wire (the original o2) sensor wire and now it starts and runs but for some reason I'm not getting a signal on my air fuel guage at all.

Where does that original wire run to and why would it cause problems if I'm wiring the o2 sensor direct now?

Also when I connect just my air fuel guage to that original black wire the guage seems to work but why would that wire send a signal if it isn't connected anywhere?? Should also mention doing this causes the car to bog and stall out, the needle.on my af guage bounces up and down between the upper spectrum of ideal and rich.

I'm not getting any CEL but have no clue what's going on, and if my O2 sensor.is even sending a signal. Can someone help me figure this mystery out?

 

because the o2 sensor helps the ecu regulate the air fuel gauge...

 

What do you mean? The o2 sensor supposedly is already wired to the ECU and what role does the original black o2 sensor wire play in all this?

 

Also does anyone know if the heater coil wires are interchangeable? I read somewhere having them backwards could cause stalling but isn't it just a heating element?

 

I'm not following what you said in your OP.

The two heater wires are interchangable. One gets key on 12V and the other goes to the ecu pin A6 on OBD1, this is the heater "control" (ground).

The signal line goes to D14 and the fourth wire is the sensor ground which is D22.

 

I am trying to make sense of what you wrote but w/o knowing what you did with the 4 o2 sensor wires, it's next to impossible to do it over the internet.

You should have 4 wires

How are they connected?

 

OK I had time to verify the wiring tonight.

One white wire is connected to a 12v + source (the black and yellow off of distributor harness actually) the other white goes to A6.

The gray I connected to D22 for ground

The black is connected to d14 and also to my narrow band air fuel guage.

Still the air fuel guage is registering nothing, and no check engine lights or anything.

 

Bump, any help?

Like I said the signal wire black is running to D14. So that means my original o2 wire from obd0 should be running.nowhere right? So I can tape it up? If that's the case why does connecting my air fuel signal guage wire to it cause the car to bog and stall out??