In the past at cruse I was able to see on my WB and NB that the O2 feeback did work. I could watch the NB do a light show while the WB showed 14.0:1 about. Now I only see solid rich on the NB and 11.0:1 on the WB. Any thoughts as to what changed or happened. All I have done to that area has been replace my NB with a new one. Can't remember when exactly this problem came up. In the PFC I have turned it on and off hoping to kick it back alive. I have also disconnected the battery a few times and had to let the idle relearn.

Thanks.

 

I checked my "sensor check" screen and saw that the O2 sensor had voltage by it and was within normal range at operation temp. I verified that it was connected by turning the car off and using an ohm meter to check for continuity through the connector to the O2 sensor.

I still have no idea why the O2 feedback just stopped working.

Could my TPS be out of adjustment?

 

Is it possible you turned off the O2 feedback control under "etc. -> Function Select" menu by accident?

 

I have checked that. It is on right now. I have turned it off and then back on in the past to try to make it work but with no luck.

Right now I am working on uflooding the car, but once it runs again I will look into this again.

Thanks

 

if adding the new narrow band was done right before this started that would be a pretty good place to start, did you check the continuity at the ecu for the o2 sensor?

 

Yes I did. The sensor works as normal. I can see it moving around on my autometer gauge when it is warming up and under boost. I have also checked the sensor check screen in the PFC and it reads voltages that correlate to the gauge and are equal to the DMM I had hooked up.

Everything works normal except at cruse the feedback does not work. It stays dead rich when it used to bounce back and forth between rich and lean.

Thanks for the input, I am still looking.

 

why not just use your WB and Comannder and tune the few cells that are effected by the O2 feedback, and turn it off.

 

I had to give up on the O2 feedback after ditching the air pump. Simply could not get the PFC to stop engaging O2 feedback at idle and slow driving. Looking at several other PFC cars it almost appears that the older datalogit software corrupts the O2 feedback. One car had functional O2 feedback until using the datalogit to adjust stuff, after which the O2 feedback started to behave as I described earlier. Weird.

Your issue is different, haven't experience it. Can always retune your highway cruise to 16:1 AFR and walk away from O2 feedback. PFC does not use the NB signal other than for O2 f/b.

 

Whats the latest version of datalogit software (I have to look at what version I have)?
But this is right around the time mine quite working on me. Umm, good point. Could unplugging the datalogit have an affect on it?

rdavidsrx7: I could do that and might if I can't get this to work again. It's just it used to work and now it doesn't so I woul like to know what happened. Either way I lean out cruse is fine by me.

 

is your tps within spec? maybe pfc is not recoginzing the part throttle(crusing) condition...

 

Without a NB connected and the O2 feedback on my WB reads 10s at idle and 11s from ~1600-2400 rpms.

Perhaps, this is a safe default mode when the O2 goes bad. I seem to recall but am not certain, that the PFC still displays a voltage value for the O2 even when it is not connected.

If you want to check the feedback system (not isolate the fault) you could disconnect the O2 sensor at its connector and record the O2 values with an without the O2 feedback on.

The latest Datalogit version is 1.1

 

follow up comment

with respect to the commander displaying a small voltage with the O2 feedback off....doesn't seem to make sense since it should be an open circuit with the O2 connector disconnected