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Thread: Swapped a L76 into a stock ly6 Truck

  1. #1
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    Swapped a L76 into a stock ly6 Truck

    I did a swap in a truck that comes stock with an Ly6 and didn't look at the serial number of the motor I put in it until i already had it in there and now it has a l76 and it just doesn't idle right so I bought the MPVI2 and now thats were im stuck on what to do next.

  2. #2
    What year?

  3. #3
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    Year of truck? ECM Type? Tune and log file?
    Daily Driver= 2016 Infiniti Q50 Red Sport 400
    Weekend Cruiser= 2009 Pontiac G8 GT (Vararam, TSP LS3 N/A Stage 1, OBX, CTS-V converter, MagnaFlows w/ J-Pipes, 160 t-stat)
    Project Car= 1991 Chevrolet Camaro RS (LQ4 w/ Gen 4 Rods, LS3 heads, 7875, 4L80 coming together )
    Truck= 1995 K1500 ECSB 5.0 5-speed (Dusty...)

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    2010 Chevy Silverado 2500, Stock Ly6 ECU.

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    2010 Chevy Silverado 2500

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    Quote Originally Posted by Juanvelez21 View Post
    2010 Chevy Silverado 2500, Stock Ly6 ECU.
    Hmmmm... Maybe find a 2009 G8 GT tune, copy over the engine settings ONLY and write calibration to get started. DO NOT WRITE ENTIRE or LICENSE THE G8 TUNE AND WRITE IT? If youre not familiar with this, DONT TRY IT. Rather get someome to help you.

    Someone might chime it and tell you to not try this. DO THIS AT YOUR OWN RISK. I think your truck has an E38, just like a G8...

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    Quote Originally Posted by jaydubb71 View Post
    Hmmmm... Maybe find a 2009 G8 GT tune, copy over the engine settings ONLY and write calibration to get started. DO NOT WRITE ENTIRE or LICENSE THE G8 TUNE AND WRITE IT? If youre not familiar with this, DONT TRY IT. Rather get someome to help you.

    Someone might chime it and tell you to not try this. DO THIS AT YOUR OWN RISK. I think your truck has an E38, just like a G8...
    Ill see what I can do.

  8. #8
    same motor just your new l76 has more compression, which means....more horsepower. don't fret it should work. get a wideband. its prob airflow or maybe spark. can you drive it?

  9. #9
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    The L76 have AFM/DoD too where as the LY6 is just VVT.

    Did you delete the AFM/DoD system?
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

  10. #10
    he can disable that stupid DOD with the software right? and cant you disable the VVT also?

  11. #11
    Tuning Addict 5FDP's Avatar
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    Yes.

    I asked because his LY6 harness won't have the stuff for the AFM system, so if that it not disabled it won't run correctly.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

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    Quote Originally Posted by 5FDP View Post
    Yes.

    I asked because his LY6 harness won't have the stuff for the AFM system, so if that it not disabled it won't run correctly.
    I meant to tell the OP that. I should've known better since I own an G8.

    Hey JuanVelez, have you pulled a copy of the tune file from the ECM yet?

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    Quote Originally Posted by jaydubb71 View Post
    I meant to tell the OP that. I should've known better since I own an G8.

    Hey JuanVelez, have you pulled a copy of the tune file from the ECM yet?
    im doing it but the truck just dies every single time i try and start it

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    Quote Originally Posted by 5FDP View Post
    The L76 have AFM/DoD too where as the LY6 is just VVT.

    Did you delete the AFM/DoD system?
    no i just stuck the motor in there and said yeet yeet

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    Quote Originally Posted by geneass View Post
    same motor just your new l76 has more compression, which means....more horsepower. don't fret it should work. get a wideband. its prob airflow or maybe spark. can you drive it?
    no it just dies but if i delete the cam correlation code it will drive but it would sound like its stalling

  16. #16
    Pull the file from the ecm and post it. It's probably airflow, timing or you need to disable some stuff

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    Quote Originally Posted by geneass View Post
    Pull the file from the ecm and post it. It's probably airflow, timing or you need to disable some stuff
    Post the stock tune file I will make some adjustments for you since I have an MPVI2 send it back.

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    Quote Originally Posted by jaydubb71 View Post
    Post the stock tune file I will make some adjustments for you since I have an MPVI2 send it back.
    2010 chevy silverado 2500.hpl2010 chevy silverado 2500.hpl here you go sorry couldn't get it done earlier
    Last edited by Juanvelez21; 4 Weeks Ago at 02:02 PM.

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    2010 Chevy Silverado 2500 tune.hpt here is the stock tune file

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    Quote Originally Posted by Juanvelez21 View Post
    2010 Chevy Silverado 2500 tune.hpt here is the stock tune file
    Here is the file with MOST of the L76 stuff copied over. VVT has been disable along with DOD.

    2010 Chevy Silverado 2500_L76engine.hpt
    Daily Driver= 2016 Infiniti Q50 Red Sport 400
    Weekend Cruiser= 2009 Pontiac G8 GT (Vararam, TSP LS3 N/A Stage 1, OBX, CTS-V converter, MagnaFlows w/ J-Pipes, 160 t-stat)
    Project Car= 1991 Chevrolet Camaro RS (LQ4 w/ Gen 4 Rods, LS3 heads, 7875, 4L80 coming together )
    Truck= 1995 K1500 ECSB 5.0 5-speed (Dusty...)