Results 1 to 9 of 9

Thread: LML Turbo Vane Trouble

  1. #1
    Junior Member
    Join Date
    Jul 2014
    Posts
    22

    Default LML Turbo Vane Trouble

    I have been fighting an issue on some LML trucks and in pretty much in all operating systems where the turbo desired and actual boost do not follow eachother. Please see the attached log file. It appears that when the truck transfers from Open loop VGT to some other vane control table the turbo vanes actually open up rather than closing down.

    I see this has been discussed before but is the resolution that there is a series of tables not mapped out by EFI live that we don't have access too? Similar to the LMM I would expect there to be a turbo vane min and max set of tables. I don't see this being tied to EGR, MAF or a max airflow table, I have logged and not found any correlation.

    Thanks for any assistance.

    2015 Log Vane drop.efi

  2. #2
    Lifetime Member
    Join Date
    Jan 2006
    Posts
    387

    Default

    I have trouble with this also, I have been able to make it a little less noticeable by closing up the open loop tables so it's a little less laggy transitioning from open to closed loop, but when your already cruising in closed loop it doesn't help. It would be nice to have some more stuff for boost control, I'm fighting one that acts fine normally and I get what I ask for until a 12000+ load is pulled up a steep grade then it will wig out open the vains and throw a P2263.
    04 LB7
    2010 LMM
    2015 LML

  3. #3
    Senior Member
    Join Date
    Aug 2008
    Posts
    100

    Default

    I believe the vane change is tied to load in some way. Sure wish we had the proper tables. I am seriously considering going away fro the factory charger just because of that. I like the turbo brake is the only thing that could keep me using it along with the right tables for adjustments.


    Sent from my iPhone using Tapatalk

  4. #4
    Junior Member
    Join Date
    Jul 2014
    Posts
    22

    Default

    Thanks for all the help. I figured it out in hex. There is a slew of tables not mapped out for turbo control alone.

  5. #5
    Junior Member
    Join Date
    Feb 2014
    Posts
    22

    Default

    Can we get them added in EFI then?

  6. #6
    Junior Member
    Join Date
    Mar 2013
    Posts
    16

    Default

    I have also had the P2263 on a few truck only when pulling huge trailer up a long hill, would sure be nice to have the tables added.

  7. #7
    Lifetime Member Tre-Cool's Avatar
    Join Date
    Feb 2006
    Posts
    937

    Default

    Sounds like a similar problem i have with a 17 Colorado (Aus model)

    I see a 30-45kpa difference between desired & actual & get turbocharger underboost dtc's

    Admin: Removed offensive Screen shot
    Last edited by GMPX; September 30th, 2016 at 08:58 AM.

  8. #8
    Lifetime Member
    Join Date
    Mar 2007
    Posts
    206

    Default

    I would love to be able to expand on the vgt table above 50mm3 of fuel. I feel that is killing these bigger chargered LML vgt guys.
    2007.5 RCLB 4x4 WT LMM 8594OS

  9. #9
    Lifetime Member
    Join Date
    Jan 2014
    Posts
    327

    Default

    getting a P2263 in a LML swapped '76 GMC I have. after pulling a light load up a grade.

    Any ideas? Its got to be tune related, all hardware is verified to be fine.

Similar Threads

  1. LML vane position at idle
    By catman3126 in forum Duramax 2011+ LML / LGH
    Replies: 31
    Last Post: May 28th, 2020, 03:31 PM
  2. Having trouble getting the vane position set with my new turbo
    By GetBoosted in forum Duramax 06 LLY / 06+ LBZ & LMM
    Replies: 15
    Last Post: July 21st, 2014, 02:28 AM
  3. Turbo Vane Sensor
    By chaserose in forum Duramax 06 LLY / 06+ LBZ & LMM
    Replies: 0
    Last Post: June 8th, 2013, 01:15 AM
  4. Min. turbo vane position?
    By IdahoRob in forum Duramax 06 LLY / 06+ LBZ & LMM
    Replies: 13
    Last Post: April 9th, 2007, 09:56 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •