Closed loop not enabling, O2 sensor at fault (I think)

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09-04-2013
operatorfailure

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Closed loop not enabling, O2 sensor at fault (I think)

I swapped a 5.3/4l60e into a 68 chevy short step side and deleted vats, rear O2s, that kind of thing. It started up and ran just fine, got my wideband, hooked it up and started tuning it and it never would go closed loop. I don't know what year the engine/trans is from but the wiring harness I got had the wrong connectors for the O2 sensors. I cut and soldered in the sensor plugs off the engine into the harness and I think this might be where my problem lies. I'm not getting much fluctuation at all in the O2 sensor voltage, and if I force it closed loop it just runs more and more rich until it dies. Any ideas?

In the second log I posted I forced it into closed loop, that is where it went crazy rich.

Oh, and I have a PLX wideband with the narrowband simulator running bank 1, but it seems to be doing the exact same thing as bank 2.
09-04-2013
operatorfailure

1 Attachment(s)

I forgot to add my config, if it is needed here it is.
09-04-2013
SultanHassanMasTuning

must be that your coolant and air temp are not reaching the needed value to go from open to closed

also why do you have really high timing at idle, you O2 need to heat up for them to work.
12-09-2013
Pro Street

I am having the same problem with a 5.3 swap into a 1995 pickup. Did you get this figure.
12-11-2013
Pro Street

Quote:

Originally Posted by Pro Street

I am having the same problem with a 5.3 swap into a 1995 pickup. Did you get this figure.

Fixed it! Called the guy that made my harness and supplied my pcm. He said I had the wrong O2's. Told me the one's to get and it is working great now!!!