Ok, got the bin pulled, patched the bin, and dumped it back to the ECU tonight, several times, all checksums come up clean so I think I've got that worked out. I feel confident now that I can successfully lift the PE4 on the E-side processor and wire it to a proper input circuit, and then just attach it to pin A28. That seems to be the most backward-compatable method, since A28 isn't used (that I know of or have found evidence of) in any production wiring harness.
Now I'm wondering if logging the 0-5V data from a wideband could be tied into the rest of the datastream in such a way that when playing back the datalog, you could see AFR variances per cylinder-the ECM is already keeping track of what cylinder is in what position, would be handy for a race engine but of limited utility when you aren't willing to chop the manifold.
Oh, turns out that this 6397 ECM is actually from a 94 3100 Grand Prix, according to the data pulled from the ECM. That would make it a small-port 3100, IIRC, which seems to be an OK place to start the tune from. 4-letter code is BKRL.
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