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Thread: 8.1 injector help please

  1. #1
    Tuner in Training
    Join Date
    Apr 2017
    Posts
    35

    8.1 injector help please

    Hi all,
    I have a 2006 Sierra 5.3 bored to a 5.7. Found some of my injectors were leaking and bought some 8.1 injectors after some recommendations.

    I installed the 8.1 injectors, but I cannot get the truck to run right.

    I am not looking for a tune, I am just begging for some help to get the truck to run normal so I can get to work tomorrow without having to swap my crappy stock injectors back in.

    I had changed the injector data to match a stock 8.1 Flow Rate, Offset, and Short Pulse Adder with no luck. I had also tried the "Limits" section as well with no luck. Truck will run, but you try to give it any sort of throttle it bogs down.

    Thank you to anyone who may be able to help me.

    8.1 injector.hplCamaro tune 5.7 3 w 8.1 fuel injc 2.hpt

  2. #2
    Advanced Tuner
    Join Date
    Dec 2019
    Location
    MS
    Posts
    567
    Is that the only thing in the tune you changed?
    What about engine size?

  3. #3
    Tuning Addict blindsquirrel's Avatar
    Join Date
    Apr 2017
    Location
    Meridian MS
    Posts
    7,641
    Which '8.1 injectors' - truck 8.1 or marine 8.1? Do they have any part numbers on them? Are they real genuine injectors, or the Chinese copy Amazon/eBay version of 8.1 injectors?