GM Drivetrain & Suspension Chassis | Transmission| Driveshaft | Gears/Rear End/Differential | Traction Aids

4l80 issues

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Old Jan 26, 2015 | 06:47 PM
  #11  
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I am not familiar with that page. Is the ISS hooked up to the PCM?
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Old Jan 26, 2015 | 07:20 PM
  #12  
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Which one? An 80 has two, correct? I unplugged the front one which I wired in for the 80/segment swap.
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Old Jan 26, 2015 | 07:24 PM
  #13  
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Front is ISS, rear is VSS. So did you reverse the wiring you changed in the trans plug if you are trying to run the relay method?
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Old Jan 26, 2015 | 07:34 PM
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Yes, I reversed the wiring from the 80/segment then changed back to the 60/relay wiring. Then reloaded my 60 tune. I haven't driven it yet as the weather is bad, but I will as soon as possible.
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Old Feb 4, 2015 | 04:48 PM
  #15  
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got to drive it today, still doing the same thing. I didnt try to shift it down into first at all, just drove it to my shop. seems like it stays in second for a long time, and when it does shift out, the convertor doesnt lock....

showing codes

P0740
P0785
P1860

Last edited by Turbostude; Feb 4, 2015 at 05:04 PM.
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Old Feb 4, 2015 | 09:40 PM
  #16  
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Originally Posted by Turbostude
got to drive it today, still doing the same thing. I didnt try to shift it down into first at all, just drove it to my shop. seems like it stays in second for a long time, and when it does shift out, the convertor doesnt lock....

showing codes

P0740
P0785
P1860
I know with relay method, the p0785 must be disabled, i think same story for the p1860. Ill have to look and make sure on that one. The p0740 i am unsure of though.
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Old Feb 7, 2015 | 09:51 AM
  #17  
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Originally Posted by 1bad2k
I know with relay method, the p0785 must be disabled, i think same story for the p1860. Ill have to look and make sure on that one. The p0740 i am unsure of though.
I went in and deleted those DTC's, it will shift 1-2, but the 2-3 is sluggish and never goes into overdrive. Once in 3rd, it acts like the convertor is locking/unlocking, kinda like its slipping, or like its low on fluid. (Fluid is good) Are there other settings I need to change? I haven't done anything as far as the tune is concerned.
Attached Files
File Type: hpt
studebaker tune 01.hpt (495.7 KB, 71 views)

Last edited by Turbostude; Feb 7, 2015 at 04:07 PM.
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