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  1. Replies
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    566

    I don't know what you mean by "scaled 25%" but...

    I don't know what you mean by "scaled 25%" but that
    alone creeps me out. There's very little about the tune
    that would want a "dumb" across-the-board falsehood
    applied.

    In my experience idle...
  2. Replies
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    756

    AIR pump is either gone or disabled, right? If...

    AIR pump is either gone or disabled, right? If still active
    then this is a likely culprit.
  3. Replies
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    1,578

    First you need to determine whether knock is...

    First you need to determine whether knock is steady
    state, or transient. They have different solutions.
    Gross mixture will have some effect on transient ping
    but the right answer is elsewhere.
    ...
  4. Might look first at the desired airflow tables...

    Might look first at the desired airflow tables for trans
    in gear, I believe I've seen different R than D/OD fields
    and maybe these have not been properly updated?

    I would not think that trans...
  5. Replies
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    710

    Transitional throttle is always a "special case"...

    Transitional throttle is always a "special case" and stuff
    goes on that takes you off the "map" developed by
    steady-state / "averaged" tuning methods.

    Lifting throttle from high RPM puts you at...
  6. Misfiring will also produce indicated-lean...

    Misfiring will also produce indicated-lean results on
    NBO2 and LSU4 WBO2 sensors. You can even get to
    so rich that misfiring gives you a lean reading (been
    there) - along with false trimming even...
  7. So add every one of the various spark retard...

    So add every one of the various spark retard components
    to your PID list (along with total advance) and see who's
    bugging. Add the advance sub-components too (just in
    case they are negative).
    ...
  8. Replies
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    1,422

    I recommend beginning with clean (OE) tune files...

    I recommend beginning with clean (OE) tune files from
    the donor vehicles ('99 Vette, '01 Camaro) but also one
    from a vehicle that does a better job of trans settings
    (like for example my '02...
  9. Replies
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    1,235

    Do you have the right kind of A/C pressure sensor...

    Do you have the right kind of A/C pressure sensor for
    the PCM? PCM is supposed to guesstimate compressor
    shaft load and work back to an airflow adder based on
    IAT and A/C pressure (and maybe some...
  10. Replies
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    2,325

    Scan for TCC_MODE and see if it reports LOCKED or...

    Scan for TCC_MODE and see if it reports LOCKED or --3--
    (do not command lock, for reasons such as misfires).

    Look at TCC_Duty and see if you're getting full apply
    commanded. Look at force motor...
  11. Replies
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    1,642

    The problem lies in how you are going to "adjust"...

    The problem lies in how you are going to "adjust" it. What
    do you think you know, how do you know your reference
    instrument is more trustworthy than the thing you're
    trying to calibrate? Neither...
  12. Replies
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    1,642

    I always like to ask what makes you think the MAF...

    I always like to ask what makes you think the MAF is
    inaccurate. It's probably more accurate than fuel trims
    at low RPM with a high overlap cam (and LSU4 wideband
    meters suffer the same from...
  13. Replies
    9
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    1,655

    Can you see any immature codes when this is...

    Can you see any immature codes when this is happening?

    When you say "idle is lost" does that mean it just flops
    and dies on pedal release? What happens if you feather
    it down to near-idle? This...
  14. Are you on the hook for non-warmed-up emissions,...

    Are you on the hook for non-warmed-up emissions, or just
    concerned in a general way?

    What are you really trying to achieve?
  15. Replies
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    1,472

    Might look at misfires (cylinder mode, current,...

    Might look at misfires (cylinder mode, current, all 8)
    to see if there's any clue about single cylinder issues.
    Failure to fire puts a lot of unused air right into the
    exhaust and the sensor will...
  16. Long trims roll up way too much random crap /...

    Long trims roll up way too much random crap / history. Short
    trims are not that much better. Especially if your fuel trim cell
    covers a wide range of RPM (like stock 4th gen F-bodies) the
    averaged...
  17. Reduced power fault mode I think comes from...

    Reduced power fault mode I think comes from disagreements
    between alpha-N, speed density, MAF airflow mode and maybe
    on DBW vehicles, between desired and actual throttle position.
    "Bad tune" might...
  18. Here's what I pulled out of mine when I bought it...

    Here's what I pulled out of mine when I bought it (used)
  19. Replies
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    1,411

    Question to me is whether you get more power and...

    Question to me is whether you get more power and more
    efficiency out of a fat mixture and early spark, or lean
    and late. This has a lot to do with combustion particulars
    and I think you want to...
  20. Replies
    3
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    1,022

    Cam swaps (on any cam worth installing) jack your...

    Cam swaps (on any cam worth installing) jack your low
    end VE (pumping efficiency) and you need to make the
    tables match the new reality. Right now your old table
    is saying that more air is taken...
  21. Match them for tuning just so things stay put....

    Match them for tuning just so things stay put. When you
    are all done, to where there's no KR showing anywhere
    but timing is tight, shave a couple off the LO table just
    for bad luck like lousy gas,...
  22. Replies
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    4,989

    I'd take a step back and check the basics before...

    I'd take a step back and check the basics before
    you try to "tune" anything. Such as fuel pressure.
    Just because you can get a "right answer" according
    to a sensor, doesn't mean you got it the...
  23. Replies
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    2,497

    MAF physical size and MAF calibration...

    MAF physical size and MAF calibration (Hz/(g/sec)) are
    not related other than by whatever's in the electronics.
    What you want is a manufacturer's calibration curve.
    Which for Delphi standard parts...
  24. Replies
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    1,217

    This capability exists on some widebands, but it...

    This capability exists on some widebands, but it may make
    a "laggy" output due to filtering behaviors which can be a
    destablilizing influence. I doubt you will get any better
    steady state...
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    989

    What about bumping the rev limiter past where...

    What about bumping the rev limiter past where you'll set it
    for driving, just for purposes of tuning? You always want
    the map to go further than the operating range. Then set
    it back when done.
    ...
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