I will keep an eye out for 7427 ecm's to play with later.

The 7747 is a direct plug in for my current ECM wheras the 7427 apparently is not so its not the best choice for me to start with. If the...

7427? Do tell.

And the netres in my 16144288 AZUS is stamped 16051537 (ends in 6 if you try to order it new because it comes with the carrier) which also happens to be the chip in the V6 7747, so...

Ok, thanks for the info, will be moving on to 7747 though it was useful practice getting this one this far apart without breaking anything, they literally dipped the whole damn ecm internals in some...

Hmm, all very interesting and informative in both your posts. Too bad those files don't have more types of stuff in them to compare.
So the pre memcal GM obd1 ecms are C3 type and the memcal type...

Ah, all very true, I should just start in a normal place and learn the basic how to's first.
Good analogy with the cab thing, though I'm the sort that would study all those extra things before...

Funny you should say that, very not the first time I have been asked if I watch big bang theory (I have seen one or two) and been accused of being Sheldon.

I figured the gear ratio in any part of...

Ah ok thanks, if the netres is only programmed with a cylinder count that's what I wanted to know for swapping it into anything and everything. I'd be curious to read exactly how a pack of resistors...

Its not that I can't find the correct ECM I just want to understand exactly whats going on but in the past people kept telling me the correct thing to do without fully explaining what everything does...

So two identical number ECM's aren't actually fully interchangeable unless they came from a vehicle with the same engine and transmission unless you swap the smaller chip out?
So what can be done...

In hunting for a 7747 ECM I have found there are any combination of engines and transmissions that use that part number. Obviously its nice to get the correct one from the start, but if I will just...

Looks like with a 1227747 I want to use ARHT-$42-5.7L-Manual.bin‎ with my transmission since everything matches my current code but the engine. If that ECM plugs right in I'll be set, hopefully the...

Pulled the 4 screws for the glove box liner out, easy access to ecm though it looks like it would take more work to actually remove it.
On a side white tag it had:
1GN0051971 AZUS

And on the top...

Its stupid of them to use the same choked off throttle body on the bigger V8's, even on the V6 I discovered the engine is desperate for more air since when I left the main PCV hose unplugged by...

All this tuning fascinates the hell outa me, not for scraping up every last horsepower but to be able to take random combinations of vehicle and engine and GM TBI (the best fuel system ever made as...