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Thread: Calibration problems

  1. #11
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    Quote Originally Posted by goldbergv95 View Post
    Erik, I figured out the problem. The reason those three calibration that you changed didnt work has something to do with the shift 1>2 trans pressure. Today, i set the trans pressure back to the orginial OS calibration and the ride was just perfect. The one from the updated OS seems to slow the truck down from shift 1 to 2 area.

    So try calibrating the trans pressure from the previous OS. It should help the B1123, B1124, and B1125 work at its advantage.
    Its not trans pressures, what it does is switch the PCM to think its operating in 4WD, check out the 4WD shift settings they will be dead on.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    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.

  2. #12
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    Quote Originally Posted by ScarabEpic22 View Post
    Its not trans pressures, what it does is switch the PCM to think its operating in 4WD, check out the 4WD shift settings they will be dead on.
    4WD shift settings? Where is that on the efilive program? I removed my 4x4 drive shaft so i no longer have 4x4 features.
    2002 4.2L I6 Trailblazer LTZ

  3. #13
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    Quote Originally Posted by goldbergv95 View Post
    4WD shift settings? Where is that on the efilive program? I removed my 4x4 drive shaft so i no longer have 4x4 features.
    Irrelevant, having 4WD or not makes 0 difference here because the tables are there regardless of if you are 2WD or 4WD. What I found is when those calibrations are adjusted in this certain OS (in my 12575262 OS they work fine) the 1-2 shift happens at 4000rpms at 30mph. This only happens are WOT, if you go 80% throttle its fine IIRC. Basically the code address for these parameters is interfering with the code address of the 4WD WOT shift parameter and causing the PCM to automatically think its in 4WD and use the 4WD WOT shift pattern.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    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.

  4. #14
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    Quote Originally Posted by ScarabEpic22 View Post
    Irrelevant, having 4WD or not makes 0 difference here because the tables are there regardless of if you are 2WD or 4WD. What I found is when those calibrations are adjusted in this certain OS (in my 12575262 OS they work fine) the 1-2 shift happens at 4000rpms at 30mph. This only happens are WOT, if you go 80% throttle its fine IIRC. Basically the code address for these parameters is interfering with the code address of the 4WD WOT shift parameter and causing the PCM to automatically think its in 4WD and use the 4WD WOT shift pattern.
    Ive compare the stock settings from the update OS to the 32 max and the orginal OS and they all seem to be the same, seems suggish under the updated OS trans pressure. Except when i use the trans pressure settings from the orginial OS the 32 max speed seem to work just fine similar to when i use to have the orginial OS tune.

    damm that sux! So your saying is rather than the 1-2 shift occurring from 30mph the 4wd WOT shift occurs causing the truck to feel suggish? Then what happen to your friends tune then since this problem occurs? Did you leave it back to stock settings for him?
    2002 4.2L I6 Trailblazer LTZ

  5. #15
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    Quote Originally Posted by goldbergv95 View Post
    Ive compare the stock settings from the update OS to the 32 max and the orginal OS and they all seem to be the same, seems suggish under the updated OS trans pressure. Except when i use the trans pressure settings from the orginial OS the 32 max speed seem to work just fine similar to when i use to have the orginial OS tune.

    damm that sux! So your saying is rather than the 1-2 shift occurring from 30mph the 4wd WOT shift occurs causing the truck to feel suggish? Then what happen to your friends tune then since this problem occurs? Did you leave it back to stock settings for him?
    No, this should have NOTHING to do with trans pressures, IIRC I reset the line pressures back to stock in an attempt to track down the problem and if I touched those tables it still messed up the shift. What is happening is when the values of those 3 tables are altered and you go WOT in 1st gear, if short-shifts at 4000rpms (at 30mph for the customers 3.73 gears). If you look at table D1216 "WOT 1->2 Shift, 4WD Mode" the stock value is 4000rpms, the exact same value that the shift is occurring at when these tables are modified. It is NOT in 4WD at all, there is a bug that occurs when these tables are altered causing the PCM to incorrectly use the WOT 4WD 1-2 shift table instead of the normal WOT 1-2 shift. The fix, simply do not alter the tables in that one OS, I have tested it on 4 or 5 other P10 OSs and only the latest 02 one is affected.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    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. #16
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    Just a thought: if your calibration has D0960,1,2 "Throttle Kickdown" (or similar tables) make sure these are all set to 100%.

  7. #17
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    Quote Originally Posted by ScarabEpic22 View Post
    No, this should have NOTHING to do with trans pressures, IIRC I reset the line pressures back to stock in an attempt to track down the problem and if I touched those tables it still messed up the shift. What is happening is when the values of those 3 tables are altered and you go WOT in 1st gear, if short-shifts at 4000rpms (at 30mph for the customers 3.73 gears). If you look at table D1216 "WOT 1->2 Shift, 4WD Mode" the stock value is 4000rpms, the exact same value that the shift is occurring at when these tables are modified. It is NOT in 4WD at all, there is a bug that occurs when these tables are altered causing the PCM to incorrectly use the WOT 4WD 1-2 shift table instead of the normal WOT 1-2 shift. The fix, simply do not alter the tables in that one OS, I have tested it on 4 or 5 other P10 OSs and only the latest 02 one is affected.
    damm bug! I will try to give the dealer a call to see if they can reflash to the previous OS if it works.

    Quote Originally Posted by joecar View Post
    Just a thought: if your calibration has D0960,1,2 "Throttle Kickdown" (or similar tables) make sure these are all set to 100%.
    Yes we have d0960,1,2. But ill give it a try to see how it works. Ill let you all know tonight.
    2002 4.2L I6 Trailblazer LTZ

  8. #18
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    well i tested it and based from the do960 to d0962, d0960 was already all 100 so nothing changed for the 1-2 shift except the 2-3 and 3-4 shift was better.

    Erik is right. there is a bug on the 02 OS prob go to the dealer and try to reflash to the previous OS thats if they would allow it...
    2002 4.2L I6 Trailblazer LTZ

  9. #19
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    Quote Originally Posted by joecar View Post
    Just a thought: if your calibration has D0960,1,2 "Throttle Kickdown" (or similar tables) make sure these are all set to 100%.
    I always have those set to 100%, I tried playing around with lower values a few years back to get it to drop into 1st under moderate WOT but found it was just better to leave them alone.

    Quote Originally Posted by goldbergv95 View Post
    well i tested it and based from the do960 to d0962, d0960 was already all 100 so nothing changed for the 1-2 shift except the 2-3 and 3-4 shift was better.

    Erik is right. there is a bug on the 02 OS prob go to the dealer and try to reflash to the previous OS thats if they would allow it...
    Shouldnt effect the 2-3 or 3-4 shifts at all??

    Yep, the 02 P10 OS 12587430 has this issue. Thats the only one Ive found so far, the rest seem to be ok (but Ive only messed with a select few OSs).
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    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.

  10. #20
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    no i ment the 2-3 and the 3-4 felt a little bit faster which is much better since im into performance. just trying to find a way to reflash to the previous os
    2002 4.2L I6 Trailblazer LTZ

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