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Thread: Converting 1996 PCM to '98+ or 0411?

  1. #11
    Lifetime Member Aloicious's Avatar
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    Quote Originally Posted by Lextech View Post
    Hey KAZ,

    The 0411 will run the stock poppets just fine!

    Jeff
    yup, I ran the 411 with the stock poppets for about 4-5 months before swapping to a MPFI intake. the 411 worked find for both
    1996 c1500 gen1e 5.7L - the "LS31", 24x CNP, LS2 coils, modified T56, 12200411PCM running COS3, zz4 cam, custom MPFI, etc. coming soon: Twin Turbos

  2. #12

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    Thanks guys.

    I have a "revised" spider assembly coming the end of this week. I will be doing the assembly, PCM swap, and lower plenum gasket all in one shot.

    I appreciate all the info and responses to my question.

    I will post up when I am finished.

    -Kenny

  3. #13

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    Having some issues guys. 1998 Vortec 411 PCM conversion. Motor is a 383 stroker with a whipple.

    If I leave the Express Van OS without COS3 loaded it runs fine. As soon as I load 02020003 it will not run properly. Will not take throttle input, idles rough (lean), and just plain stalls after a few seconds. If I reflash the PCM with the Express van OS only it runs fine.

    Any thoughts?

    This is about the 12th COS3 I have loaded into an LS1 based PCM and never had this issue before.

    I attached the .cal file. Very basic, but no run with it.
    Attached Files Attached Files

  4. #14
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    Try setting P0101,P0102,P0103 to non-emissions. Are you sure you want your B3647 table to look like that?

    Jeff
    Last edited by Lextech; May 26th, 2008 at 08:05 AM.
    98 GMC RCSB 2WD, Internally stock 305 w/Twin T-3 junkyard Turbos,4L80e,Ramjet intake,42lb.inj., 0411PCM, COS3,4675LBS w/me in it. Best Time on 5 passes-13.01@110

  5. #15

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    Ok Jeff,

    I changed P0101 etc to non-emissions and moved B3647 to 0.98. It runs fine now. Normally I can start and begin setting up everything the way I had it. Why is this one different?

    Thank you sir. I was severely banging my head against the wall wondering what the hell the problem was. I really need to get a heavy bag hanging from the wall to relieve my stress from time to time and help clear my head.

    Thank much!
    -Kenny

  6. #16
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    Cool,
    After 117 posts, I finally got 1 right.
    98 GMC RCSB 2WD, Internally stock 305 w/Twin T-3 junkyard Turbos,4L80e,Ramjet intake,42lb.inj., 0411PCM, COS3,4675LBS w/me in it. Best Time on 5 passes-13.01@110

  7. #17
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    I got around to the 0411 swap in my 96. Got it running with van tune. Was wondering what pid to use to check the distributor position i cant find cam retard or cmpret in the v8 software.

  8. #18
    Joe (Moderator) joecar's Avatar
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    Look for that pid in the V7 scantool.

  9. #19
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    I have 7.5 software i did find it in there but it says its not supported and can only seem to flash or read data through the v8 software sense it made me update my sotware to do anything.

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