While trying to tune the new setup, I noticed that
my datalog shows readings that just don't match.
The right seems to be consistantly and significantly lower than the left.
I'm seeing this both in Block Learn and Integrators.

The car runs decently smooth (for a cammed car).
Should I be paranoid?

I wanted to load it on a dyno and get some A/F and TQ curve
numbers to help finish the tuning this week.

I'm running freshly flow matched 30# injectors and brand new O2 sensors.
I have mids and I am running both a cat and muffler.
The car is a 93 Firehawk (non-heated o2 sensors)

 

How significant is the difference? What are the values?

 

Like 90 right VS 130 left.

I can see the PCM trying to correct and it gets back around 128 every so
often, only to spread out again. I can dump the datalog to .csv or .xls
if you want to see it. (Or in raw TunerProRT format)

Sometimes they're both acting just fine and working in parallel.
But the right seems to diviate south 20-40 of the left on a regular basis.

Could the O2 sensor on the right be flaking out on me?

 

Switch the O2 sensors and see what it does. If the problem switches banks, then you know it's the O2. Then, you can start trouble shooting if that's not it.

Wait, I saw you put new headers on too. Were they coated? You know lots of people have had problems with their O2's going crazy after the header install because the coating gets on the O2's. Maybe that's the problem.

 

Normally, the BLM's can't go below 108 and its sort of unusual for a programmer to widen the upper and lower limits. Are you sure you're seeing "90" in a cell? What are the BLM values for as many cells as possible?

It would be very unusual for the BLM in a single cell to vary back and forth over a range of 128 to "20 or 40" lower (in addition to not being possible unless the programming has been changed). Are you sure you aren't just seeing the left BLM change, for example, as the PCM moves to a different Cell?

 

I've had these headers for quite a while now, but the sensors are new.
They went in with the new heads/cam.

I should have clarified that statement, sorry.
(Having just reread the thread, I see how where I got confused)
Right integrator is the one that droping to 90.
Block learn are not as far apart. but the right spends a lot of time
down at 108, while the left moves around from 108-130

 

I'm getting kinda the same thing after an L2 head/emission cam install. The right BLM goes lower when the cansiter purge and/or egr are activated thats cell 10 I beleive. Do you have the split in all cells? Cruising the BLM's are good 128-131 but closed throttle either coasting or idle they climb up to 140.