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Thread: LQ9 wont stay running after FAST LSXrt 102mm tb/intake swap...HELP?

  1. #1
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    Question LQ9 wont stay running after FAST LSXrt 102mm tb/intake swap...HELP?

    Here is my current open loop tune to start AUTO.VE with:

    OLPreFAST.ctz

    The truck starts great, then dies a second or two after. If I hit the accelerator it dies quicker.

    1. Does that mean it is getting too much GAS or too much AIR?

    2. And either way, how do I go about adjusting for that?

    Log of start is attached below, disregard AFR for now because gauge was apparently off and needs to be recalibrated.

    LS1B_0178.efi

    3. Is there anything special I need to do in the tune with no MAF being plugged in?
    Last edited by sac811; December 14th, 2013 at 02:07 PM.

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    Quote Originally Posted by joecar View Post
    It means the idle air is not correct... you will need to do some idle tuning, have a look thru here:



    Make sure that a MAF DTC triggers immediately <-- important
    When you say idle air is not correct, do you mean Desired Airflow (B4307) in the Idle subfolder?

  4. #4
    Joe (Moderator) joecar's Avatar
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    Yes.

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    Quote Originally Posted by joecar View Post
    Yes.
    I got it to startup and idle until it reached operating temperatures. But how do I update B4307 with new numbers without a MAF Sensor?

    Here is the log I made:

    LS1B_0181.efi

    Thank you for all the help

    Jeremy

  6. #6
    Joe (Moderator) joecar's Avatar
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    Use GM.DYNAIR in place of SAE.MAF... but note that GM.DYNAIR relies on VE table being close.

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    For my corrections to VE table MAP, I will be having columns of KPa vs rows of rpms obviously, but for the data I will be using BEN from Wideband factor (WO2BEN) correct?

  8. #8
    Joe (Moderator) joecar's Avatar
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    Yes, for VE table map, Data is CALC.WO2BEN.

    For idle tuning, use CALC.RAFIG (see the idle tuning threads above).

  9. #9
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    Question

    Ok, so having a bit of trouble here.

    At light throttle and idle the AFR is Stoich to richer than stoich. But as soon as I give it more than about 5% throttle the AFR goes WAY LEAN.

    I'm at home now and just added a bunch of fuel to b3605 to temporalily not destroy the motor. I am attaching the log that showed super lean.

    LS1B_0187.efi

    Tune:

    OLPostFAST_b4307mod.ctz

    Which was 1.00 eq ratio across the board for warmer temps non-PE mod.

    1. Other than adding to b3605 is there something wrong or somewhere else I need to look for the problem?

    2. Or is that what I need to do until I get some logs for the VE table to be corrected and then I should be able to drop back the Open Loop Commanded fuel to around 1.00 eq again after that?

    Basically while under load it goes lean, but once cruising at speed it goes back to close to stoich

    Thanks
    Last edited by sac811; December 16th, 2013 at 07:22 AM.

  10. #10
    Joe (Moderator) joecar's Avatar
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    Are you getting a MAF DTC...?

    Is your FPR manifold-referenced...?

    Is your B4001 table correct for your injectors...?


    Disable B4206 (the tutorial does not mention this, the tutorial was written based on 2002 F-car which already had it disabled).

    You still have CL enabled, see B4205.

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