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Thread: Gen VII 2002 8.1L

  1. 11-03-2021 #1
    RootBreaker
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    Gen VII 2002 8.1L

    First, I did not see a forum section for this so placing here due to year.

    I am going to buy hptuners soon.. few things on ebay....

    My question..I swapped an 8.1L into my squarebody, had a guy rework the harness and do a hot tune. Finally swap done and she runs awesome when cold. When she hits 180ish and up.. chockes, stumbles and back fires...robbed of power.

    Could this be due to a 'hot tune' someone is guessing at or something else?

    no engine codes
    have 2 upstream 02s
    egr delete
    have maf, crank and cam sensors...

    thoughts?
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  2. 11-03-2021 #2
    Oleblu
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    Our thoughts are post a tune file and a log of this happening
    Last edited by Oleblu; 11-04-2021 at 07:19 AM.
    97 ext cab short bed silverado 5.7 411 swap, edelbrock 29135 intake, lightly ported 906 heads milled .035 thou. factory press in rocker studs & rockers, comp 787 retainers & stock locks, ls6 springs. Comp cams 08-503-8 T56 swap

    86 SWB crate vortec 5.7/th350 The wife's truck
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  3. 11-04-2021 #3
    RootBreaker
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    Quote Originally Posted by Oleblu View Post
    Our thoughts are post a tune file and a lot of this happening
    Sounds good
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  4. 03-08-2023 #4
    RootBreaker
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    Quote Originally Posted by RootBreaker View Post
    First, I did not see a forum section for this so placing here due to year.

    I am going to buy hptuners soon.. few things on ebay....

    OK apparently my definition of soon is different than most!

    Good and bad news..

    Good news - bought hptuners and it arrived yesterday!
    Bad news - caught truck on fire! not too bad but too cold and busy to work on it. I will get her going soon though, hopefully, and post up my logging data. Gonna run through the software, how to log and learn about this thing!!!!
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