No PE and LTFT's are always maxed at +25

[mrfister77]

I have tried everything I can think of and have failed. My '02 Silverado 5.3 4l60e bolt-on's and cam + ls7 inj. w/ 3200 stall Yank 373:1 rear has absolutely no PE, or it seems like it. The longer you hold the throttle the leaner it gets.
Also the LTFT's are always pegged at +25 always. The start-up is always stupid lean. I kept thinking it was the VE so I checked it rechecked it and checked it again. I'm only off by 1-3 where it is off. I have thought about trying to disable the VE and run on only maf if you can do that just to check it against the VE.
Thanks in advance for any help on this matter.

[mrfister77]

Here are some other logs and tunes if it helps to see my process. Also some of the KR is an exh. rattle I haven't got to fix yet.

[Google]

I have tried everything I can think of and have failed. My '02 Silverado 5.3 4l60e bolt-on's and cam + ls7 inj. w/ 3200 stall Yank 373:1 rear has absolutely no PE, or it seems like it. The longer you hold the throttle the leaner it gets.
Also the LTFT's are always pegged at +25 always. The start-up is always stupid lean. I kept thinking it was the VE so I checked it rechecked it and checked it again. I'm only off by 1-3 where it is off. I have thought about trying to disable the VE and run on only maf if you can do that just to check it against the VE.
Thanks in advance for any help on this matter.

You have your B1S1 and B2S1 02's shut off..



..

[mrfister77]

Where did you find that so I can fix it?

[mrfister77]

I logged some pulls after changing the wot maf adj. and noted some wicked delivered torque #'s compared to before the changes.

[Google]

Where did you find that so I can fix it?

DTC's




..

[mrfister77]

If you don't mind me asking how does disabling the o2 DTC's disable the sensor?

[Google]

If you don't mind me asking how does disabling the o2 DTC's disable the sensor?

same way it disables the v.a.t.s., cats, and rear 02's..



.

[edcmat-l1]

same way it disables the v.a.t.s., cats, and rear 02's..



.

I think that's wrong. Turning off the codes does not disable the function. They're still working, and it looks as if they're forcing stoich, even though it's taking +25%.

Disabling VATS or CATS or post cat O2 codes does not diable their function either. It only disables their respective codes. VATS has it's own switch to actually disable it's function.

OP, have you checked your fuel pressure? I see you have the VE jacked up too. Have you run it in SD? Or are you attempting to change the VE with the MAF enabled?

[Google]

I think that's wrong. Turning off the codes does not disable the function. They're still working, and it looks as if they're forcing stoich, even though it's taking +25%.

Disabling VATS or CATS or post cat O2 codes does not diable their function either. It only disables their respective codes. VATS has it's own switch to actually disable it's function.

OP, have you checked your fuel pressure? I see you have the VE jacked up too. Have you run it in SD? Or are you attempting to change the VE with the MAF enabled?

Kinda like when some o.s.'s will ignore the maf when setting the dtc's to no error reported and some will still use the maf in the airflow calculations..

I have proven in the past that 02's when disconnected can cause trims to go to the extreme. Even though they should not..

Point being why not have them set correct and eliminate a possible cause as it is fast and free.

..

[edcmat-l1]

Kinda like when some o.s.'s will ignore the maf when setting the dtc's to no error reported and some will still use the maf in the airflow calculations..

I have proven in the past that 02's when disconnected can cause trims to go to the extreme. Even though they should not..

Point being why not have them set correct and eliminate a possible cause as it is fast and free.

..

Now you're talking in circles. Disabling the codes for a MAF will not necessarily make the computer ignore it. Again, supports my previous post. To DISABLE THE SENSOR, the fail high needs to be zeroed. FWIW, I always zero the table just to make sure. Even at that, you're not really disabling the sensor, you're only failing it. It will still report Hz.

On the subject of O2s and disconnecting them to force open loop, I too have seen it drive fuel trims through the roof. Your point?

In the log posted, it is clear that the O2s are functional, and doing their job. The fact that the codes are set to no error has no bearing on the condition.

[Google]

Now you're talking in circles. Disabling the codes for a MAF will not necessarily make the computer ignore it. Again, supports my previous post. To DISABLE THE SENSOR, the fail high needs to be zeroed. FWIW, I always zero the table just to make sure. Even at that, you're not really disabling the sensor, you're only failing it. It will still report Hz.

On the subject of O2s and disconnecting them to force open loop, I too have seen it drive fuel trims through the roof. Your point?

In the log posted, it is clear that the O2s are functional, and doing their job. The fact that the codes are set to no error has no bearing on the condition.

You have your view I have mine.


..

[edcmat-l1]

You have your view I have mine.


..

Your "view" in this instance is wrong, with all due respect. Look at the log, and tell me the O2s are disabled. It's not a "view" it's a fact.

[12secSS]

Based on your posted tune, you are modifying the VE table while the MAF is still functioning. You need to disable the MAF and fix your FUBARed VE table, then re-enable the MAF and fix that. What Ed has posted is inline with getting your truck to run properly. When the O2 sensors switch back and forth, it clearly means they are working. Period, no argument. Do a test while logging ... with the bi-directional controls turn off closed loop and fuel trim learn and then reset the fuel trims, what is the AFR error then.

[mrfister77]

I've been using the RTT setting to tune the ve, is that the wrong thing to do? Or am I just doing it wrong?

[12secSS]

Stop modifying the VE table unless you set the "MAF Fail Frequency" to zero, found under "Engine" - "Engine Diagnostics" - "Airflow".