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Thread: L21 stock file

  1. #1
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    Default L21 stock file

    Looking for a L21 454 stock file to compare some stuff.

    thanks

  2. #2
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    Year make/model please. I don't have my files named by engine designation, sorry.

  3. #3
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    According to wikipedia it appears those were used in 99-02 Topkick and motorhome. I don't have one, sorry.

  4. #4
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    You got me curious, lol. I want to know now too. The PCM is one of these ACDELCO 21812298 {#19143664} which is pre-p01 style as noted below.

    Click image for larger version. 

Name:	19143664_Primary__ra_p.jpg 
Views:	61 
Size:	27.9 KB 
ID:	23861

    CHEVROLET BUS 1999-2000
    CHEVROLET CAMARO 1998
    CHEVROLET CORVETTE 1998
    CHEVROLET KODIAK 1999-2000
    CHEVROLET P30 1998-1999
    GMC P3500 1998
    GMC TOPKICK 1999-2000
    PONTIAC FIREBIRD 1998

    Monday I will find a vin for the 2000 topkick with the 7.4 and buy/sps the file and program it to a PCM core on the bench I have if I can. The bin file will not be comparable to the black box l29 but if what I plan works I can get you all or most of the calibration data. I hate it when I get curious
    Last edited by In-Tech; August 14th, 2021 at 05:19 PM. Reason: added picture

  5. #5
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    Quote Originally Posted by In-Tech View Post
    You got me curious, lol. I want to know now too. The PCM is one of these ACDELCO 21812298 {#19143664} which is pre-p01 style as noted below.

    Click image for larger version. 

Name:	19143664_Primary__ra_p.jpg 
Views:	61 
Size:	27.9 KB 
ID:	23861

    CHEVROLET BUS 1999-2000
    CHEVROLET CAMARO 1998
    CHEVROLET CORVETTE 1998
    CHEVROLET KODIAK 1999-2000
    CHEVROLET P30 1998-1999
    GMC P3500 1998
    GMC TOPKICK 1999-2000
    PONTIAC FIREBIRD 1998

    Monday I will find a vin for the 2000 topkick with the 7.4 and buy/sps the file and program it to a PCM core on the bench I have if I can. The bin file will not be comparable to the black box l29 but if what I plan works I can get you all or most of the calibration data. I hate it when I get curious
    yeah I figured it was LS1a type hardware. Its a cool beast for sure and I'm doing something similar and just looking for a comparable tune file.

    Thanks!!

  6. #6
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    Any luck?

    I have the PCM from an L21 out of a 2000 School bus. The moded (Heads/Cam) engine is in my 96 Impala. I'd really like to know if there is any value in using the L21 OS and tune.

  7. #7
    Joe (Moderator) joecar's Avatar
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    Do you have a pic of the service tag on your PCM

    ( maybe even a pic of the PCM might help )

  8. #8
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    Click image for larger version. 

Name:	L21 PCM from 2000 school bus.jpg 
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Size:	962.4 KB 
ID:	23977

    Sorry for the late reply. The email went to spam folder.

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