Rb26 Afr

[GTRNUR]

Thats the problem.

It stays rich with it on or off, it does not make a difference.

As far as i can tell o2(1) is ok

I would just like to know if o2(2) is supposed to cycle as well or remain constant.

Thanks.

Ah... sorry i misunderstood. No they are both supposed to change. You definatly have a dead 2nd o2 sensor.

Some widebands setups output a simulated narrowband output too. You might be able to wire that to the ecu instead of replacing your dead sensor.

[Don Dada]

I use the AEM uego wideband which i think has the output but i'm using the stock ecu. I only hooked up the pfc to read the O2 voltages (borrowed from a friend).

One other thing i noticed was when i gave it a quick rev to 2000rpm the air flow voltages will go up to about the same amount but AF2 will drop off before AF1, and will go to about 0.2v and then climb back to meet AF2 at about 0.9v where two of them remain steady.

The two air flows are clean and i am using the stock air box at the moment.

Could some one else give me their opinion on the O2(2) sensor remaining constant? And which one the pfc takes as the O2(2) sensor the front or the back?

Thanks again.

[GTRNUR]

Here is the service manual data for the O2 sensor. Also, get some CO Contact cleaner and hose out your MAF sensors.

O2.pdf

[Don Dada]

Yea already have that info. thanks anyways.

I also noticed from the manual the front o2 sensor suppose to cycle between 0-1v and the rear in P or N range 0v and other than P or N range 4-5v

So i guess i should be looking for a voltage fluctuation between 4-5v ????

[Don Dada]

Well changed th o2 sensor today using a rb25det sensor, it was a direct plug in for the rear sensor on r33 rb26 just the wire on the sensor is shorter so i had to reroute the harness...no biggie though.

Anyway my ratios now look as they should- Idle at 14.7-15.3 an when i hold it at 2000rpm it cycles between 14.7- 15.7

So i guess i would be looking forward to some improved fuel economy

Thanks for all the help guys