Lazy O2-ve tuning problems -Need a mentor

[cfar]

I have found that my right O2 is stuck mid way by my aeroforce guage
I have had many issues with PE tuning since I went 2 bar OS.
I know I am using a wide band but some how I still can not get VE right
Some say use MAF and some not to use.
PE runs like 10.0 to 9.0 according to my LM1 and trims keep runing minus values. started a new file and log to make sure everything was set up right-no luck.

I will install new O2's and start from scratch again
Do not know what else to do -any help
Should or can I go back to Normal OS untill I get this right

[12secSS]

Post your tune file and a log, to me it sounds like you are not doing the VE/wideband tuning right.

[Cybnext]

Post your tune file and a log, to me it sounds like you are not doing the VE/wideband tuning right.

Agreed, sounds like he is still in closed loop when he refers to his trims.

[jimmyblue]

"Stuck" NBO2 is a typical PCM response to a
(perceived) sensor fault. If you have some O2
codes it will jam it to 450mV or so. Then fuel
trimming, I dunno what happens (suspect open
loop on that bank?).

[S2H]

I have found that my right O2 is stuck mid way by my aeroforce guage
I have had many issues with PE tuning since I went 2 bar OS.
I know I am using a wide band but some how I still can not get VE right
Some say use MAF and some not to use.
PE runs like 10.0 to 9.0 according to my LM1 and trims keep runing minus values. started a new file and log to make sure everything was set up right-no luck.

I will install new O2's and start from scratch again
Do not know what else to do -any help
Should or can I go back to Normal OS untill I get this right

post the tune file from your car and post a log of what you are experiencing..
we really cant help unless we have something to look at
too many speculations otherwise

[cfar]

post the tune file from your car and post a log of what you are experiencing..
we really cant help unless we have something to look at
too many speculations otherwise

OK
Had no O2 codes-no codes at all
here is the set up I used to tune VE with a LM1 wide band-
LTFT (VE) TUNING

1: Unplug MAF only if the MAF does NOT contain the IAT. If it does leave it plugged in.
2: Disable the SES lights for MAF codes P0101, P0102, P0103 (No check engine light.) Do not completely disable the codes or the PCM will not fall into SD mode. Only turn off the SES light, DO NOT DISABLE THE CODES THEMSELVES! Copy your high octane table to your low octane table since in SD the low octane table is used.
3: Start up your scanner. Start up your histogram. Now, click File then connect. Go to tools then VCM Controls. Reset Fuel Trims.
4: Drive around for a good 30 minutes after the car is hot trying to hit as many cells as possible and multiple times. It is good practice to set the minimum cell count to at least 25 for more accurate data. The best way to do this is with a wideband o2 but can be done with fuel trims. Doing it with fuel trims can be inaccurate as once PE mode is in effect readings will become off. Setting the PE enable to 75 kPa doing the fuel trim approach will help get more accurate data, above 75 kPa will not be accurate much at all, the wideband is the best method.

5b: wideband approach: log your AFR error, right click on the VE table in the upper left corner, then go to paste special then multiply by %, that was easy wasnt it?
6: Repeat steps 3-5 until ALL values are between 0 and -4. Try and do this all in same day for best results.

Installed two new NBO2's
Will do a new flash and log tonite and post
BTW
I was told my problem was the MAF plugged in and not in SD.
Is the problem because I disconnect the 5 wire MAF and IAT reads -38*
Should I cut the yellow MAF signal wire to keep the IAT reading

Thanks

[Cybnext]

I'm not sure about cutting the wires, but if you're trying to tune with a wideband in OLSD, you don't need to worry about your NBO2s since they aren't regulating fuel. With OLSD, you're LTFTs should be reset and showing 0.0% the whole time, same with the STFTs.

[cfar]

I'm not sure about cutting the wires, but if you're trying to tune with a wideband in OLSD, you don't need to worry about your NBO2s since they aren't regulating fuel. With OLSD, you're LTFTs should be reset and showing 0.0% the whole time, same with the STFTs.

I just did the NBO2's just because one failed
The wire I am refering to is for the MAF signal,since in a 2 bar SD you do not need a MAF but I still need to read IAT-YES?
Others have said to plug MAF in after VE.
What is correct?

[Cybnext]

I understand what you're saying about the wiring for the MAF. I'm just not sure what to do about it. I suppose you could just cut the wires, but I'd say cut them up high enough just incase you wanted to reconnect them at some point.

You still need an IAT reading, so yes that needs to be plugged in.

It is up to you if you want to return to a MAF after you tune your VE. The VE table may need to be updated due to weather changes, etc which the MAF would make up for. If you decide to return to a MAF, you will want to tune your MAF table also.

[Russ K]

Just set the Maf fail freq to 0, and set P0103 to no light. And leave the Maf plugged in so the IAT will function. Now you will be able to tune the VE table.

Russ Kemp

[cfar]

Just set the Maf fail freq to 0, and set P0103 to no light. And leave the Maf plugged in so the IAT will function. Now you will be able to tune the VE table.

Russ Kemp

Ok I did that but here is what was suggested by Bill...

EC Tune would have to explain what he meant there as I have not experimented with our 2 or 3 bar & still using maf, but as stated in the help file
"2 Bar MAP - Speed Density (GenIII V8) This enhancement contains the following features:
2bar MAP sensor support (calibration capability for GM 0-5V linear MAP sensors)
Extended Main VE table to 210kPa (2bar)
Retains full 5 kPa resolution in non-boost regions (most calibrations)
5 kPa resolution in boost regions (most calibrations)
secondary VE table not used (if applicable)
New MAP referenced "Boost Enrich" table
New openloop MAP threshold
Dual (High and Low Octane) Spark table support
Speed Density mode only"
apparently Rick at synergy has messed with running maf with our 2 bar as well so you've got a couple of references that may have done it with success...but those operating systems were never MEANT to run maf.

[cfar]

post the tune file from your car and post a log of what you are experiencing..
we really cant help unless we have something to look at
too many speculations otherwise

OK here is what I just logged until my lap top battery was low
LTFT stayed at 0
STFT will not go less tha -12's
please review and advise
Attachment 5313

Attachment 5314

Attachment 5315

Attachment 5316

Attachment 5318

[cfar]

Ttt