Originally Posted by
1project2many
Welcome. Sounds like a practical way to approach your conversion. Did you have to make any changes to fit the larger throttle body on the 2.8 intake manifold?
$4E is a code that identifies a family of calibrations. As a general rule, the location in the file where each variable or table is found will be the same for all calibrations of the same family (or Mask ID) Any tuning software that can read one $4E calibration can read all. If that ecm was only used in one application it's possible there's only one mask ID available for it.
GM often made multiple calibrations for the same vehicle or for similar vehicles. Manual trans vs auto, one gear ratio vs another, California emissions vs Federal, A/C vs Non-A/C, etc. And sometimes there are several different calibrations for exactly the same set of equipment. I used to try all the appropriate calibrations to see which one worked best then use that as a baseline for my tuning.
Happy tuning.
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