lean tune

[swingtan]

To left of cursor: NBO's are switching at 1+ second intervals, too slow.
To right of cursor: NBO's are not working.

How many miles on the NBO's...?

Exactly what I was looking at. They seem to work OK for a while, but then stop switching. At this point, they indicate they are stuck in a "lean" state (very low OP voltage), but the LTFT's remain around -10% and keep pulling fuel. So either the LTFT learn rate is very slow, or the PCM has dropped into OL mode and turned off LTFT learning. If it was just a vacuum leak, the trims would keep things in check and the LTFT's would be positive to compensate for air flow not measured by the MAF. It should also be worse at low MAP readings, where a leak would have more of an effect. Maybe it's full PCM reset time and clear all trims, start from scratch?

Simon.

[southern]

when in pe wb says around 13 and is pretty steady. jusr looked over that log and yea nb shut down most of the log.

[southern]

may do that just a full reflash on a earlier tune or a stock tune and go from there

[Chuck L.]

Ne value???
http://omgili.com/o2-sensor-test-wideband

Scroll down to the "good info" video and clik on it....

[joecar]

+1 test your wideband sensor like in that video.

[southern]

Well still not sure what it is or was but setup a ve tune which I will include that has a lower ve the my other tune and did a full reflash along with running a ground straight to the battery with nothing else besides my wb hooked into it. Log shows it running rich everywhere and my wb is more stable and does not jump around as much. Still not sure about the 02's tho. Here is the tune and log.

[swingtan]

It might be time to upgrade to COS3. If you chart your WB reading at idle against your IAT's, you can see that as the IAT rises, the mixture is leaning out.This is easier to correct with COS3, but you can do it in the current OS using B4901 and B4901 ( it's a bit harder though ).

As for the rest of the log, where IAT's are fairly stable, the average BEN factor is between 0 and 0.95 which is fairly good. The log is quite short and misses many cells in the BEN MAP though,as well as the throttle moving around a lot. For a quick view though, it's headed in the right direction. The MAF is failed in the tune, but still connected so we can cross reference the VE table to the MAF. It shows that the MAF is set fairly close to the VE table in this tune, so the overall fueling should be fairly good once the O2's are switched back on.

I'd re-enable the O2's ( leave the MAF off for the moment ) and see how it goes. If the trims goway out again, then it points to the O2's playing up in some way. If it goes OK, then I'd re-enable the MAF and see what happens then.

Simon.

[southern]

Lookin at the 02's in the log they still look like they are messing up. Like I said tho the are fairly new. I should be able to run with out them tho correct? Would it be all that safe without them? I am going to get a good log or two tomorrow and see how far it is out in more cells before turning 02's back on. Thanks for the help

[swingtan]

Running full OL is fine..... IF you can trust the WB and have the fueling set up correctly.

[southern]

Well all is well ve is around .99-1.01 so wb is back up and working correctly. How much of a pain is it to swap to cos3 I was taking a look at it and it looks like the fueling table would be nice. And I am going to just stay running without the 02's truck is running great without them anyways. Thanks again for the help guys