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Thread: Rich on CL after OL tuning

  1. #1
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    Rich on CL after OL tuning

    I tuned my car OLMAF. I have the AFR dialed in where I want it. .99-1.01 Lambda. I'm running MAF only because it just feels a little crisper.

    As soon as I switch to CL if goes rich at idle. I scanned it in CL and then forced OL with the scanner and you can see the change. I did a copy paste mulitply % for the differences and it's not better.

    I may be having senior moment but I'm lost.


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    CAM- 236/242 617/613 111+2
    SVO 30#, Fast 92, Ported LS2 TB, LTs, no cats, CAI, Nitrous(not important for this).

  2. #2
    Advanced Tuner blownbluez06's Avatar
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    Not sure if this is a contributing factor, but I see the P0101 is set to "No error reported" Try setting it to "no mil light" instead
    I know the P0102 and P0103 will cause trouble in that mode.
    Hsquared racing engines RHS 427, Procharger F2, Moran Billet Atomizer injectors, Alky Control,Mast LS7 heads, Nitrous outlet kit,Tilton quad disc clutch, DSS shaft, RKT56 ZR1 trans, RPM Quaife diff. Built and tuned by yours truly.

  3. #3
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    Thanks I'll give it a try. Anything else standout?

    You have a hell of a car man. I watch your posts on CF...

  4. #4
    Advanced Tuner blownbluez06's Avatar
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    Thanks man. about to start up another build thread on my car. I can't seem to leave it alone.

    I don't notice anything else that jumps out at me.
    Hsquared racing engines RHS 427, Procharger F2, Moran Billet Atomizer injectors, Alky Control,Mast LS7 heads, Nitrous outlet kit,Tilton quad disc clutch, DSS shaft, RKT56 ZR1 trans, RPM Quaife diff. Built and tuned by yours truly.

  5. #5
    Advanced Tuner oakley6575's Avatar
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    I have the same issue with my truck. OL is dialed in at lambda and then when it goes into closed loop, it sits right at .97 lambda. Mine doesn't go crazy rich like yours does but its still kind of frustrating.
    Last edited by oakley6575; 07-15-2012 at 02:45 PM.
    2003 Chevy Silverado Daily Driver, 408 Iron Block,
    LS3 Heads/Intake, 231/239 114, 4L80e, Yank SST 3200.

  6. #6
    Advanced Tuner oakley6575's Avatar
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    Closed loop is disabled in your tune that you posted. The enable ect is at 250*. Are you commanding CL in the scanner? Also try and change your switchpoints to 451 across the board and see if that has any effect.
    2003 Chevy Silverado Daily Driver, 408 Iron Block,
    LS3 Heads/Intake, 231/239 114, 4L80e, Yank SST 3200.

  7. #7
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    Yes in that scanner I just forced it in the scanner so I could it in one log file.

  8. #8
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    Neither DTC change or the switch-point change made any difference. I have no idea what the dealio is.

  9. #9
    Advanced Tuner blownbluez06's Avatar
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    If I were dealing with this problem, I would raise the VE up and see if the fueling responds accordingly. That would prove you're MAF only. If it responds, time to focus on why it's still referencing the VE
    Hsquared racing engines RHS 427, Procharger F2, Moran Billet Atomizer injectors, Alky Control,Mast LS7 heads, Nitrous outlet kit,Tilton quad disc clutch, DSS shaft, RKT56 ZR1 trans, RPM Quaife diff. Built and tuned by yours truly.

  10. #10
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    Good suggestion. I will give it a try tomorrow.