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Thread: 2003 GMC 2500 LQ4 Power Enrichment

  1. #1
    Potential Tuner
    Join Date
    Jan 2024
    Posts
    4

    2003 GMC 2500 LQ4 Power Enrichment

    Forgive me if this information is already posted but I am trying to understand the stock Power Enrichment setting in my 03 GMC 2500 LQ4. It looks to me like it is basically not functional from the factory? Most of the tune files I have looked at seem to be different but the LQ4 has:
    1. It comes on at 90% throttle
    2. Only at 5500 RPM which hardly ever get to
    3. The delay is 60 seconds

    Tuning is not my day job obviously but I would like to set it to something like 60% throttle with .5 sec delay and 3600 RPM or something recommended. I would really appreciate anyone helping me wrap my head around this and or what I need to know to set it up better or why I shouldn't?

    Tune attached...

    Thanks

  2. #2
    Senior Tuner
    Join Date
    Nov 2006
    Posts
    2,751
    You can remove the timer and the RPM delay. They aren't needed. This is a good spot to make a big difference on these.


    Adjust the TPS and MAP qualifiers so that it is only getting to PE at heavier loads.
    Tuner at PCMofnc.com
    Email tuning!!!, Mail order, Dyno tuning, Performance Parts, Electric Fan Kits, 4l80e swap harnesses, 6l80 -> 4l80e conversion harnesses, Installs

  3. #3
    Advanced Tuner
    Join Date
    Sep 2021
    Posts
    475
    Set the delay to 0, delay rpm 1200-1800, torque% to 50, map entry 75-85kpa, throttle start around 60-70%. I usually taper the throttle table lower toward higher rpm.