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Thread: t42 4l80 swap timing/fuel pull at WOT or partial throttle

  1. 02-07-2023 #1
    Jevin E
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    t42 4l80 swap timing/fuel pull at WOT or partial throttle

    i have a 2008 Silverado e38/t42 combo i recently did the swap to a 4l80 under certain conditions it pulls lots of timing and the source is trans (it is spark and fuel at times) but any advice would be nice because it is preventing me from correcting my fuel tables trans issue2.hpl6.0 4L80E MAF STEP 2.hpt here is a log and tune file (yes i know it needs some work)
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  2. 02-07-2023 #2
    Alvin
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    All of your torque management and abuse mode stuff is there and not zeroed out..

    Brake torque management too.
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  3. 02-07-2023 #3
    Jevin E
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    so i tried taking all TQ man out it did not make a difference on my lunch changed brake torque to 6040 wiling to spin on take off but trans will come back and still pull timing any thing else i should look at probably wont be able to respond till home due to work
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  4. 02-07-2023 #4
    blindsquirrel
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    Did it do this before you made the changes to abuse mode?
    GM Gen4 Injectors v2.1.xls
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  5. 02-07-2023 #5
    Jevin E
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    Yes it did
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  6. 02-08-2023 #6
    Jevin E
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    it has been like this since i did the swap
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  7. 02-10-2023 #7
    Jevin E
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    Quote Originally Posted by Alvin View Post
    All of your torque management and abuse mode stuff is there and not zeroed out..

    Brake torque management too.
    By chance do you have any other advice on what to check
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  8. 02-10-2023 #8
    Alvin
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    Post a current file so I can check to make sure you took TM and abuse mode off. Also post a log with a timestamp where you notice this
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  9. 02-10-2023 #9
    Jevin E
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    6.0 trans check.hpttrans timing pull.hpl 6:27 to 6:30 as well as 8:29 to 8:32 ish
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  10. 02-10-2023 #10
    Jevin E
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    Quote Originally Posted by Alvin View Post
    Post a current file so I can check to make sure you took TM and abuse mode off. Also post a log with a timestamp where you notice this
    I?m thinking it?s something with this tcm file
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  11. 02-13-2023 #11
    Alvin
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    Try this.. I don't know if it will fix your issue.

    If it doesn't log TCC apply and current gear ratio.

    BTW. you have a miss on the drivers side. I"ll bet your feeling this hiccup more than the TM

    6.0 trans check 2.13.23.hpt
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  12. 02-13-2023 #12
    Jevin E
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    Quote Originally Posted by Alvin View Post
    Try this.. I don't know if it will fix your issue.

    If it doesn't log TCC apply and current gear ratio.

    BTW. you have a miss on the drivers side. I"ll bet your feeling this hiccup more than the TM

    6.0 trans check 2.13.23.hpt
    It?s probably the exhaust leak I swapped the WB and NB spots

    Also I?ll give this a try and log the gear ratio
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  13. 02-16-2023 #13
    Jevin E
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    Problem is fixed I appreciate your assistance
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