Ok first off I fully admit I am a complete retard when it comes to engine management. I know this is a stupid question I allready probally know the answer but... with the power fc do I still need the 02 sensor. I bought the car with the power fc allready installed but the 02 sensor was missing??? The car ran perfectly fine so I am thinking the stand alone does not need the 02 sensor... Can someone please inlighten me.

 

You can run it with or without. Here is an interesting thread on the issue:

https://www.rx7club.com/power-fc-forum-47/recalc-base-bad-idea-446486/

 

I am running into this same issue. I just recently had my o2 sensor reattached to the ECU harness, hoping for slightly better gas mileage and that the car will run a little bit better. DO I need to turn on the 02 sensor in the PFC to get it working again? Or should it automatically start working?

 

You have to enable o2-feedback control. This can be done with the Commander or Datalogit.

 

in the sensor check menu of the commander, it says the 02 sensor is receiving voltage of .92v at cruising and it varies throughout the RPM band. does this mean it is enabled?dd

 

Please read the PFC manual, enabling/disable the o2 feedback is perfectly explained in there...


If you are getting an O2 voltage of 0.92 during pure cruise (well into vacuum), then your o2 sensor probably needs to be replaced.

 

Also, to repeat this since this is a little obscure...

If your PFC has been tuned with a datalogit and the correction map has been applied to the base map (correction map will be all 1's, you can check this with the commander), then you do NOT want to turn on O2 feedback since it's not going to function correctly. Shouldn't hurt anything, but will just make your car run crappy.

 

so correct me if i'm wrong, but after reading thru that other thread that was linked...... am i on the right track by thinking that i'll run into less problems WITH the o2 sensor wired in?

 

If the O2 sensor that you installed is a good one, go under Etc, Functions..., and enable the O2 feedback. That is it. Car should give you better gas mileage.