I have a 2005 350z DE non-rev.
As the title states. I installed Berk TP not so long ago and added non-foulers to eliminate the SES light from coming on. I recently got ahold of Uprev tuner package and have been reading about tuning, but as I read I wondered if the non-foulers create any type of inconsistency when reading and data-logging my A/F ratio. Please someone enlighten me a little bit on this matter.

Thanks

Tony_z

 

Nevermind, I found the thread in which this problem is discussed.

Please lock thread!!


Thanks!

 

you should probably post a link to the "found" thread here for future ref. it can only help.

 

Very long and complicated answer is yes you should remove them at least for tuning.

 

This is the thread where I found it:
https://my350z.com/forum/tuning/5520...and-input.html

Djamp answers somewhere around there. Apparently the o2 sensors we have after our catalytic converters do their work when the system is in closed loop (example would be cruise control or going at a constant speed with low rpms for a long period of time). So if you have TPs and are using non-foulers the the data you are logging for tuning, will not be accurate and this will in the future read SES codes for lean banks etc etc. (This is the short answer hahaha, there is more into this)

Thanks for the info Djamps! Goodstuff!

 

I can't see this affecting the logging as its wot for that.

I will also add that I can't repro this on my car

 

Well, it wont affect WOT tuning, but if you don't want the SES to show up every time, I guess it's better to get rid of the non-foulers.

 

The non foulers stop the code showing up....

As i said, it seems it's not on all cars, i've checked with Osiris on my car, and i can't get this problem to show, so i wouldn't bother messing with them unless you can do the same thing.

 

So you are running Uprev, which version?

 

Also I'm talking about P0174 code (System Too Lean (Bank 2)).

----> Not code P0037 (HO2S Heater Control Circuit Low (Bank 1 Sensor 2)) <---- Downstream o2 sensors, which is why you added non-foulers to trip this code. I did but it didn't work on my 2005 Z.

 

I am running Uprev, just no tune added yet, i've been monitoring this problem and trying to repro it on my car, i cannot.