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Thread: Sluggish O2 sensors

  1. #21
    Advanced Tuner Ghostnotes's Avatar
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    Everything else is pretty good.It idles good, no surging on part throttle and can idle at 6mph with no surging.
    If all this info going on in another thread with the VE,zone boundary errors and crazy surface numbers works out, I can finally get it done.

    I have an issue with misfire at around 4k but I'm pretty sure it's tuning. I can slowly roll into it and go to redline. If I punch it, it will start to misfire around 4k. HPFP/LPFP is good.PE is working according to pedal/rpm/torque. Ive checked EOI, timing and my cam is locked. Ill post a scan later but is it possible to be going into PE too soon??
    I always tune VVE....
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  2. #22
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    im seeing this same issue on a 2014 silverado 5.3.tsp long tubes.codes p015a and p015c. codes are permanent. ive been doing read some reading on this. what is the general consensus on the fix?

    engine/fuel/oxgen sensor/intergral delay/ airflow mode? add 15-25 % on all values?

    also heard about messing with max lean and max rich values in same area, like mentioned earlier in the thread.

  3. #23
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    Quote Originally Posted by Ghostnotes View Post
    Everything else is pretty good.It idles good, no surging on part throttle and can idle at 6mph with no surging.
    If all this info going on in another thread with the VE,zone boundary errors and crazy surface numbers works out, I can finally get it done.

    I have an issue with misfire at around 4k but I'm pretty sure it's tuning. I can slowly roll into it and go to redline. If I punch it, it will start to misfire around 4k. HPFP/LPFP is good.PE is working according to pedal/rpm/torque. Ive checked EOI, timing and my cam is locked. Ill post a scan later but is it possible to be going into PE too soon??
    What are you commanding/actual at WOT? Maybe you're still too rich...
    2023 Ford Maverick 2.0T AWD

  4. #24
    Advanced Tuner Ghostnotes's Avatar
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    Ill check for exact when i get home. I think its 1.97xx but dont quote me. My WB sits at .75 lambda for shure.

    For PE that is...
    Last edited by Ghostnotes; 01-13-2020 at 05:06 PM.
    I always tune VVE....
    2016 C7 M7 Z51
    Callies ultra billet crank
    Callies ultra billet rods
    Diamond pistons
    Jhonson high speed lifters
    Ported and polished headwork
    Custom cam
    YSi-V7

  5. #25
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    Quote Originally Posted by TriPinTaZ View Post
    Set the O2 mv's swing to 450/450 instead of 550/350. This will waken them up a little bit. Common change when doing long tubes. It shouldn't change the max/min fuel trims observed in the scanner, but it should make the low throttle and idle trims react quicker.
    is this the only change beging made to the 02 to get them change quicker? or do you change those values along with Engine>Oxygen sensors> Integral delay airflow mode x 15%?

  6. #26
    Advanced Tuner Ghostnotes's Avatar
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    Whoops i missed a one in there....its 1.197.

    The only thing i have not checked is injector voltage to see if there might be something going on there.

    It did not do it in the beginning. The car ran fine buuuut i wanted to tune VE and ran into the "problem". Plus being summer i wanted to make corrections AND i did not have the breakout cable yet. So i figured i did something stupid with the VE and had a local so called tuner tweak it. This started happening and then my tablet crashed......everything was gone. Even my base tune. So all i had was what was in it. Luckly i saved my VE/VT to a seperate thumbdrive.The tooner could not figure it out either. Again the car besides that runs fine. O2's are happy,no surge,returns to idle just fine and my VE calcs work. I travel 30 miles one way to work and can go all week on a tank without the low light coming on. Pulled the plugs and they look fine as well.
    Last edited by Ghostnotes; 01-13-2020 at 05:30 PM.
    I always tune VVE....
    2016 C7 M7 Z51
    Callies ultra billet crank
    Callies ultra billet rods
    Diamond pistons
    Jhonson high speed lifters
    Ported and polished headwork
    Custom cam
    YSi-V7

  7. #27
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    Quote Originally Posted by Aaron Hines View Post
    is this the only change beging made to the 02 to get them change quicker? or do you change those values along with Engine>Oxygen sensors> Integral delay airflow mode x 15%?
    What got my fuel trims to read accurately was to lower Proportional>Airflow Mode by 10% and increase Integral Delay>Airflow Mode by 15%.
    2023 Ford Maverick 2.0T AWD

  8. #28
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    Quote Originally Posted by HeavyChevy305 View Post
    What got my fuel trims to read accurately was to lower Proportional>Airflow Mode by 10% and increase Integral Delay>Airflow Mode by 15%.
    thank you for that. i will try that and report back.

  9. #29
    Advanced Tuner Ghostnotes's Avatar
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    Is .75 lambda too rich for PE? Im running straight 93 no meth.
    I always tune VVE....
    2016 C7 M7 Z51
    Callies ultra billet crank
    Callies ultra billet rods
    Diamond pistons
    Jhonson high speed lifters
    Ported and polished headwork
    Custom cam
    YSi-V7

  10. #30
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    You've got a C7Z, right? In my opinion, it's too rich for forced induction with port injection, let alone forced induction with direct injection. I'd target 0.84 or 0.85 if it were mine.

  11. #31
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    Quote Originally Posted by Ghostnotes View Post
    Is .75 lambda too rich for PE? Im running straight 93 no meth.
    Yes. .82-.85 is a the safe sweet spot for the street for supercharged LT4's. If you only run it at the track you can get a little leaner but the payoff isn't worth it. I'm assuming you are also talking about what your wideband sensor is showing.
    Last edited by TriPinTaZ; 01-15-2020 at 05:34 AM.
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  12. #32
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    Quote Originally Posted by RobZL1 View Post
    You've got a C7Z, right? In my opinion, it's too rich for forced induction with port injection, let alone forced induction with direct injection. I'd target 0.84 or 0.85 if it were mine.

    No its an Z51 LT1 but that's pretty much a moot point.
    Last edited by Ghostnotes; 01-15-2020 at 03:01 PM.
    I always tune VVE....
    2016 C7 M7 Z51
    Callies ultra billet crank
    Callies ultra billet rods
    Diamond pistons
    Jhonson high speed lifters
    Ported and polished headwork
    Custom cam
    YSi-V7

  13. #33
    Advanced Tuner Ghostnotes's Avatar
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    Quote Originally Posted by TriPinTaZ View Post
    Yes. .82-.85 is a the safe sweet spot for the street for supercharged LT4's. If you only run it at the track you can get a little leaner but the payoff isn't worth it. I'm assuming you are also talking about what your wideband sensor is showing.
    Ok I'll give that a shot. I do remember reading somewhere here that 11.2-11.7 was used. TS books also called for the same. I always ran.85 on my NA cars port injection though.
    I always tune VVE....
    2016 C7 M7 Z51
    Callies ultra billet crank
    Callies ultra billet rods
    Diamond pistons
    Jhonson high speed lifters
    Ported and polished headwork
    Custom cam
    YSi-V7

  14. #34
    Advanced Tuner Ghostnotes's Avatar
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    Quote Originally Posted by TriPinTaZ View Post
    Yes. .82-.85 is a the safe sweet spot for the street for supercharged LT4's. If you only run it at the track you can get a little leaner but the payoff isn't worth it. I'm assuming you are also talking about what your wideband sensor is showing.
    Ok I'll give that a shot. I do remember reading somewhere here that 11.2-11.7 was used. TS books also called for the same. I always ran.85 on my NA cars port injection though.
    I always tune VVE....
    2016 C7 M7 Z51
    Callies ultra billet crank
    Callies ultra billet rods
    Diamond pistons
    Jhonson high speed lifters
    Ported and polished headwork
    Custom cam
    YSi-V7

  15. #35
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    Quote Originally Posted by HeavyChevy305 View Post
    What got my fuel trims to read accurately was to lower Proportional>Airflow Mode by 10% and increase Integral Delay>Airflow Mode by 15%.
    looks like those changes worked to get rid of p015a & po15c. stft used to spike to 25% intermittenly.not anymore. codes were perminate and now they are gone after a few days of drving around. thanks a lot!

  16. #36
    Advanced Tuner Ghostnotes's Avatar
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    So just to be clear, 12.4 on an LT1 forced induction is safe??

    I thought i mentioned that but did not looking back.
    I always tune VVE....
    2016 C7 M7 Z51
    Callies ultra billet crank
    Callies ultra billet rods
    Diamond pistons
    Jhonson high speed lifters
    Ported and polished headwork
    Custom cam
    YSi-V7

  17. #37
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    Quote Originally Posted by Ghostnotes View Post
    So just to be clear, 12.4 on an LT1 forced induction is safe??

    I thought i mentioned that but did not looking back.
    You said you're running an LT4 blower on how many pounds?
    2023 Ford Maverick 2.0T AWD

  18. #38
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    Quote Originally Posted by HeavyChevy305 View Post
    You said you're running an LT4 blower on how many pounds?

    No it's a YSi-V7, running 6 psi, as slow as i can spin it right now. Stock diameter lower with a 3.8 upper. Technically it's not even awake yet. The block is built for max power, but I still have stock (LT1) pumps and injectors. Fuel is keeping up, especially from what I learned from the banish DVD.

    The AFR question in the end, revolves around my mid rpm range stumble. I thought if I was too rich,that might be causing it but the plugs tell me that all is well.
    I always tune VVE....
    2016 C7 M7 Z51
    Callies ultra billet crank
    Callies ultra billet rods
    Diamond pistons
    Jhonson high speed lifters
    Ported and polished headwork
    Custom cam
    YSi-V7

  19. #39
    Advanced Tuner Ghostnotes's Avatar
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    Going to try again tomorrow to run a scan on it and will post it up.
    I always tune VVE....
    2016 C7 M7 Z51
    Callies ultra billet crank
    Callies ultra billet rods
    Diamond pistons
    Jhonson high speed lifters
    Ported and polished headwork
    Custom cam
    YSi-V7

  20. #40
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    I'd like to see a log first but yeah, I would lean it out to .85
    2023 Ford Maverick 2.0T AWD