Page 2 of 2 FirstFirst 12
Results 11 to 18 of 18

Thread: gm.trqeng

  1. #11
    Senior Member
    Join Date
    Nov 2014
    Posts
    166

    Default

    dtc has been programmed out for 7 years now.

    so no thoughts on what im seeing?

  2. #12
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003
    Posts
    28,374

    Default

    ECM ignores MAF only if MAF DTC shows up.

  3. #13
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003
    Posts
    28,374

    Default

    Without MAF DTC, ECM is using both MAF and VE at different times/conditions.

  4. #14
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003
    Posts
    28,374

    Default

    You can program MAF DTC's to not light up the MIL when the DTC is present, but this is not the same as disabling the MAF DTC's

  5. #15
    Senior Member
    Join Date
    Nov 2014
    Posts
    166

    Default

    there is no maf and no maf signal. the ecu cant be using it, right? or am i misunderstanding what you are saying?

  6. #16
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003
    Posts
    28,374

    Default

    You did not misunderstand me

    Log SAE.MAF and see what it shows.

  7. #17
    Senior Member
    Join Date
    Nov 2014
    Posts
    166

    Default

    2.52 steady.

  8. #18
    Senior Member
    Join Date
    Nov 2014
    Posts
    166

    Default

    so you are saying the maf might not be properly "failed" in the tune and is somehow contributing to the torque calculation in an inappropriate way (while cylinder mass is calculated correctly)?

    what im seeing is this: torque in blue compared to dyncylair and ibpw in the maf-less cos3 tune.

    edit: the roads were finally dry (after several weeks), so i "failed the maf" on a stock setup/tune and did some logging. there is no big difference, torque follows ibpw/dyncylair like it should. max is around 5200, probably because the (stock) ve table is rising up to redline. its also a bit lower as about 10 degrees get pulled, but thats it.

    so again: what could make the torque read highest at 3800 with cos3 and centri boost?

    (btw, i cant attach any files larger than 1 mb in here? if i wanted to post a logg, how is that done? i cant even post a print screen.)
    Attached Files Attached Files
    Last edited by dian; 4 Weeks Ago at 04:37 AM.

Page 2 of 2 FirstFirst 12

Similar Threads

  1. Question about GM.TRQENG pid
    By carlsonauto in forum 4speed RWD/FWD Transmission Tuning (incl T42)
    Replies: 5
    Last Post: May 22nd, 2012, 02:14 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
  •