Looks like the 98 PCM's are certainly very different to the P01/P59. They say you learn something new ever day. Recently I have been going backwards, I forget more things my wife said to do the day before. I do have a 98 PCM here in Australia which came out of a perfectly running car. If any one ne...

Possibly the issue isn't a corrupt eeprom but the checksums being stored in there and not being updated correctly? Interesting they say flashing the original file back can fix it on that HPT link.

Yeah just checked that also. It could be that SPS may download additional files that are not shown in the SPS calibration screen (Which does occur for certain modules such as E38's). spscache directory only has the one binary and the utility file if I remember right. I used to pull them from SPS an...

More info from the HPT website. I stupidly flashed his hptuners file to this replacement PCM and probably caused it. Though I've had no issues doing that with other non-hptuners tools (tunercat, efilive, etc) with binaries i pulled from SPS. https://forum.hptuners.com/showthread.php?2928-97-98-V8-an...

Only lists one calibration module on the TIS site:

9375581 9375573 N/A New calibration to correct the A/C compressor from cycling improperly during heavy acceleration.

That is my understanding or something like it. Nothing in the pcm otherwise screams "hey i'm a flash chip" I even opened up the middle and there's nothing inside (it's a weird 2 PCB deal with the ribbon cable between it) Whats its VIN? We can lookup what the factory OS/Cals are suppose to...

Here's another reply from the guy that supposedly can fix:
https://ls1tech.com/forums/pcm-diagnost ... -what.html

"Vins are in the 98 pcms, Just not in the standard Bin file. They are on an eeprom."

Yes still pulls VIN, serial, etc. Not sure what part exactly gets corrupted, but it's not a full wipe or corruption. When you get the P0601 code on these the fuel pump won't prime and they act funny. Maybe there is a slave chip.. and that has the information??? That is my understanding or something...

Yeah this is the very first ls1 pcm used in 97-98 vehicles and the dbw 24x coil near plug 7.4 big blocks in big trucks. Similar but very different animal and very hot garbage temperamental. 526b145273546746ae4aabf8f22a3953.jpg If you use a scantool, does it pull a VIN or anything like that? Yes sti...

That is just how these work, that data is not in the flash, even doing a full read and write with a BDM it does not touch the vin, serial number, seed, key, etc. It's in another chip somewhere else. It's alluded to by multiple people in other forums 10+ years ago when these were more common to be m...