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Thread: LML Tuning

  1. #1
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    LML Tuning

    I just purchased HPT primarily for a couple other vehicles, but I'm thinking I may want to use it on my LML as well.

    Currently I have a tune from a vendor, using ezlync, that has recently had some poor reviews on the quality of their tunes. These are the issues I am having:
    1. At idle it goes back and forth between a deep rumble and a high pitch whistle, like every 2 or 3 seconds. I prefer the sound of the rumble, but want whatever is best for the vehicle in terms of reliability and performance.
    2. It flutters when you let off the accelerator pedal, and I have heard that is bad, so I would like to fix that.

    What sort of things can I look for in the tune to edit in HPT to resolve these issues?

    Thanks!

  2. #2
    Senior Tuner Jim P's Avatar
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    Emissions intact or no?

  3. #3
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    Quote Originally Posted by Jim P View Post
    Emissions intact or no?
    ...
    Last edited by putergod; 05-06-2021 at 08:27 PM.

  4. #4
    Senior Tuner Jim P's Avatar
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    Being an LML, whatever tuning is on it for off-road (no emissions equipment), you won?t be able to do a read of the ECM and get the tuning on it to adjust to your liking. HP Tuners VCM editor will generate a stock file for you and it will not be set for emissions off, so using it will cause the truck to throw codes and go into derate.

  5. #5
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    Quote Originally Posted by Jim P View Post
    Being an LML, whatever tuning is on it for off-road (no emissions equipment), you won?t be able to do a read of the ECM and get the tuning on it to adjust to your liking. HP Tuners VCM editor will generate a stock file for you and it will not be set for emissions off, so using it will cause the truck to throw codes and go into derate.
    Well that sucks.

  6. #6
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    Yes LML have a write only ecm. HPT populates a stock file to tune from as Jim said. LMM and before are read/write
    2006 GTO 403ci lsa heads kooks long tubes corsa ss exhaust OTR intake HPTuned

    2010 GMC Sierra LMM Duramax. Exhaust and tuned

  7. #7
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    Then why list it as supported? Doesn't sound very supported...

  8. #8
    Senior Tuner Jim P's Avatar
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    Because emissions tampering is illegal and thus emissions parameters isn?t openly available. Many businesses have been shut down in the USA with extreme fines for tampering with emissions.

  9. #9
    Senior Tuner Jim P's Avatar
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    Also, the way the LML ECM?s are designed, they aren?t designed to have whatever is stored in them to be read.

  10. #10
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    My question didn't really have anything to do with emissions.... However, on off-road vehicles, it's not illegal, but that's not really the topic. Just think it's odd the PCM can't be read.

  11. #11
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    Does this mean the TCM also can't be read?

  12. #12
    Senior Tuner Jim P's Avatar
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    Actually unless it came without emissions to begin with, it is illegal. Many people with more money than you have argued the legality of it in court stating off-road use and have lost. I don?t know about the TCM, but the ECM can?t be read on the LML. Doesn?t mean it?s not very supported. The software provides you a tune file.
    Last edited by Jim P; 05-07-2021 at 05:35 AM.

  13. #13
    TCM is read/write

  14. #14
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    I'm working on tuning my 2015 LML, I was able to read my ECM with my MVPI2 and get my stock tune parameters. I have been tinkering with my DTC screen and trying to figure out the fuel flow charts. I would like to hear your experiences with your tune. I'm down here in west Texas so I'm deleting my truck. I've got a tune from my 09 LMM that was supposed to be a 40hp tune and delete. That truck ran good and got about 20-22mpg on the highway. I would like to get close to that out of this truck.

  15. #15
    Senior Tuner Jim P's Avatar
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    LML can?t be read. The MPVI2 does a call for your VIN number and calibrations and the software generates a stock file for you. Deletes involves much more than the DTC?s.

  16. #16
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    I stand to be corrected, it did give me a stock file. Jim P, are you on here to help people wanting to learn or just argue about people wanting to delete the emissions?

  17. #17
    Senior Tuner Jim P's Avatar
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    I?m not arguing anything. Nothing but facts. Personally I don?t care what a person does to their vehicle but I don?t divulge how deletes are done either.