I was doing a little touch up to my MAF table and I noticed in the scanner that the 02 sensors were still adding fuel even though they were disabled in the tune. Closed loop enable was set to 284 across the entire table, and LTFT are disabled. They didn't seem to add fuel the entire time, only in occasionally. Is there a reason for this??

You can see it mostly at the very end of the log when I pulled in my driveway and let it idle for a bit. But if you skim through the entire log, you can see spikes from the 02's out of no where and then the AFR goes rich. Just wondering if this is normal?

 

Can't see your log from my phone but whenever you go from your closed loop tune to an open loop tune you are resetting fuel trims with the scanner correct?

 

Bout time they release an HPT mobile app.

 

Yes fuel trims were reset. You would have to see the log. I don't know if it's adding fuel or what it's doing.

But you can see at the very beginning of the log, the O2's are silent and it idles at 15 afr. Then if you skip to the very end of the log, the O2's start creeping in and the afr goes to about 14.3...

 

I just looked at the log, I dont see the o2 adding anything? ?? The only thing I see is the 02's start switching, but they should be considering what your wide band is reading...

What frame number does it happen?

 

So they aren't adding fuel, they are just reacting to the richer mixture?

 

The o2? Yes. They just "switch". The LTFT and STFT look to be disabled to me.

 

Yes they are disabled. That's why it confused me when I saw them moving and my afr went rich. Thanks guys