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  1. Sequential is not necessary. With TBI the...

    Sequential is not necessary. With TBI the injectors are fired left bank, right bank, over and over, most of the time. PFI mode gives time between injection events for fuel to vaporize.
    There is...
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    I suggest you modify your file to work with the...

    I suggest you modify your file to work with the Vortec heads.
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    Something was messed up with the BRDW file you...

    Something was messed up with the BRDW file you had. I have edited post 6 and attached a good file. Please lmk if it looks better.
  4. Yep. It runs. But it might lead to an...

    Yep. It runs. But it might lead to an interesting discussion if you consider why GM spent millions of dollars designing ecm code and memcals to deliver fuel differently if the engine is equipped...
  5. Hello and welcome to the forum. You can use...

    Hello and welcome to the forum.

    You can use either the stock .bin or the Edelbrock file but there are many changes involved with converting TBI to MPFI correctly and the chip alone does not cover...
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    All of the information you are looking for is in...

    All of the information you are looking for is in the disassembly. Really.

    I will try to correct the definition file tonight. I can't read or view correct spark and fuel values until the...
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    This is a modified $0D file. The only...

    This is a modified $0D file. The only modifications so far are changes to titles of paramaters and categories from "0D" to "63." Most of what I've looked at lines up with $0D. Please lmk if you...
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    I do not know of a source for $63 xdf. A quick...

    I do not know of a source for $63 xdf. A quick search reveals many people asking for a definition, and although every piece of the puzzle exists to make one, no one seems to have done it. I do see...
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    What are you using to view the file? If you are...

    What are you using to view the file? If you are not using a definition file made for $63 then you might see some errors. The disassembly has desired idle rpm vs park/neutral tables. Depending on...
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    No, that's definitely not right. There's some...

    No, that's definitely not right. There's some garbage found a way into the file you attached.

    Try this one. It's taken from the file which also has source code.

    Edit: This post contains...
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    There's nothing to apologize for. If the file...

    There's nothing to apologize for. If the file was read from a chip that has greater storage capacity than calibration needs, the beginning of the file is padded (filled) with useless data. Once the...
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    Hello, and welcome to the forum. A segment...

    Hello, and welcome to the forum.

    A segment swap is used on OBDII calibrations but that that technique is not usually applied to OBDI calibrations due to the way the calibrations are arranged. You...
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    Both the timing and fuel needs for those heads...

    Both the timing and fuel needs for those heads are different from the stock TBI engine. Do you have the tools to burn chips? Are you interested in learning to burn your own?

    Dave at Old School...
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    Folks seem to apply the term "Vortec head" to...

    Folks seem to apply the term "Vortec head" to different types of heads. If you are using the 8 bolt intake style heads they are much less restrictive than swirl port TBI heads. A calibration for...
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    We had an issue a couple of years ago with the...

    We had an issue a couple of years ago with the attachments taking up too much server space. I had to change some forum settings and some of the attachments became disconnected from the messages they...
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    I have 3500 5.7 4L80E files ranging from 98 to...

    I have 3500 5.7 4L80E files ranging from 98 to '01. This is a '99.
  17. Welcome to the site. Nice to see fans of the...

    Welcome to the site.

    Nice to see fans of the old J cars are still around. I've got an '89 Sunbird GT and a 94 Cavalier RS. 93-94 was the peak for the J body platform imo. There's plenty of...
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    Thermal compound is the preferred solution. ...

    Thermal compound is the preferred solution. Dielectric grease does not aid in heat transfer. If the distributor is corroded and showing white powder where the module attaches it's a good idea to...
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    ECM controlled spark timing imo offers more...

    ECM controlled spark timing imo offers more benefit than ecm controlled fuel delivery. I believe Howell does not alter timing because it makes their job much easier. I have looked at different...
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    I'm concerned it's like some of our Ford and...

    I'm concerned it's like some of our Ford and Chrysler modules which allow initial configuration but do not allow changing once programmed.


    If the configuration cannot be changed with a...
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    Hello, I have never tried reprogramming a CCM...

    Hello,

    I have never tried reprogramming a CCM but the information here agrees with many posts on different threads. It appears the CCM, like many other modules today, can be programmed after...
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    This is good. Howell used to be good about...

    This is good. Howell used to be good about trying to provide support if you got completely stuck. If it turns out a Howell supplied component is bad you may be able to obtain replacement parts...
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    Welcome to the forum. $42 is the correct code...

    Welcome to the forum.

    $42 is the correct code for a true Howell conversion. If the swap was done using junkyard parts you should locate the ecm and get the part number or service number to ensure...
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    Hello, Welcome to the forum. I've always...

    Hello,

    Welcome to the forum. I've always enjoyed seeing well executed 4X4 van conversions. Did you change the cam along with the heads? Even with the stock cam you will notice the difference.
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    Welcome to the forum! That certainly sounds like...

    Welcome to the forum! That certainly sounds like a fun project. Even a stock engine could benefit from some tuning in that application. Are you planning to make any changes to the engine internals?
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