Results 1 to 6 of 6

Thread: E38 6.0 Streetrod/Stanalone Swap - Very little ignition TIming

  1. #1
    New Member
    Join Date
    Aug 2011

    Default E38 6.0 Streetrod/Stanalone Swap - Very little ignition TIming

    Hoping someone can help me out-

    I've installed a 2008 6.0 and transmission into a street rod. I have a timing problem. The engine runs proper timing at idle and part throttle cruise, but as you tip into the throttle the timing decreases significantly all the way down to the 0-5 degree range. I have shut off all of the normal things you would in a street rod type application. I am using the T42 TCM. I am using a E38 ECM with a 2007 4.8 liter calibration to get around the cylinder de-activation system.

    There are no codes in the ECM or TCM, but I'm thinking there is something that it doesn't like.

    Any help or educated thoughts would be appreciated!


  2. #2
    Lifetime Member ChipsByAl's Avatar
    Join Date
    Feb 2006


    A log and a tune file will help out.
    "Trash that carb and get Injected!"

  3. #3
    Lifetime Member ChipsByAl's Avatar
    Join Date
    Feb 2006


    sorry duplicate
    "Trash that carb and get Injected!"

  4. #4
    Lifetime Member
    Join Date
    Dec 2007


    Is "tip in" torque mgt active?

  5. #5
    Lifetime Member
    Join Date
    Mar 2006


    OK, we definitely need a tune if you're trying to use a different OS with a different size engine. Did you set the cylinder volume correctly?

    Are you running a MAF?

    What do you mean "get around the cylinder deactivation", just using a tune without it doesnt turn it should really disable everything from the original tune (or a tune for your engine from a different platform).
    2013 Sonic RS Manual - 1.4L I4T E78, starting the mods
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  6. #6
    Lifetime Member swingtan's Avatar
    Join Date
    Jul 2007


    There are a number of things that may be causing this.

    • Torque Reduction from the TCM.
    • Torque Reduction in the ECM.
    • If the original tune file was for a manual, you may be triggering CFCO timing.
    • Any of the many spark correction maps for ECT, IAT, ETC.

    As Erik says, post a log and the tune.


Similar Threads

  1. e38 4l80 swap 07 silverado cant get speedo to work???
    By b18cls1 in forum E37, E38 & E67 PFI ECM's
    Replies: 16
    Last Post: July 6th, 2010, 01:45 AM
  2. Ignition timing issue,bank to bank
    By AllOutPerformance in forum Gen III V8 Specific
    Replies: 9
    Last Post: December 5th, 2009, 11:38 AM
  3. E38 AC management in an engine swap...
    By harascho in forum E37, E38 & E67 PFI ECM's
    Replies: 1
    Last Post: June 7th, 2009, 09:48 PM
  4. Transmission swap in E38/E67 vehicle.
    By XLR8NSS in forum Gen IV V8 Specific
    Replies: 24
    Last Post: February 2nd, 2009, 09:04 AM
  5. Ignition Timing
    By VetPet in forum General (Petrol, Gas, Ethanol)
    Replies: 3
    Last Post: May 30th, 2006, 02:47 AM

Posting Permissions

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