About the only gm ecm/pcm I think I would swap to, would be the 1220411. Its sequencial, has great aftermarket support, and can run a 6cyl. But its just so freaking expensive to tune. It would also require harness mods, and probably a couple diffrent sensors, and a crank trigger wheel/pickup fabed for it, cause the jeep one would not work. It would be really hard to hack up the factory untouched harness in my jeep (that I have had for a long time, and has always been my baby) If I modded the stock ecm, then thats the only thing modded. If it didnt work, or work out, I could just swap back to the original ecm and be done.
So lets "pretend", for now, swapping to a diffrent ecm/pcm is not a option. I would like to keep the discussion on "is it possiable" I pulled the top cover back off the spare ecm I have, and looked through the gel with a flashlight, and its a 27c256 eprom in it, with the little picture of texas on it, also has a sticker covering the window and a bunch of numbers on it. There is a setting in the moates prom I/O for that chip. So I'm thinking it could be read? The jeep ecm's also have a 7 diget number on them, with the last 3 being twice the size of the first 4. The spare one I have is from a 93 cherokee automatic (my wrangler is a 93 5 speed) I had read the cherokee is supposed to have a "better" timing table. All I noticed was slightly less torque, so I swapped back to my original one.
The first 4 digets are the same on both, so I would assume this would translate into a ecm service number (if we want to think of it like that) and the last 3 digets are whats diffrent. So I would assume thats gonna translate into a BCC or the tune on the chip.
I just want to make sure, that beyond any reasonable doubt, that the jeep ecm is absoultely postatively not hackable/tuneable before I even start to think of swapping to a diffrent/gm pcm. I dont mind chip bruning, and I just LOVE emulation/real time tuning. And emulation is just so expensive to do with the 411.
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