I am in need of some info on how to open up a A/D converter in a 747 ecm. I am working on trying to use a MAF sensor on a TBI setup. I am not affraid of the amount of time it will take as the test engine is an Olds 307 sitting on my engine stand. I am planning on using a ford type MAF sensor, although dimented24/7 has almost talked me into a LS1 style. The only thing he mentions is that it has some resolution issues at low engine speeds and demand. That tells me it is a little large. I am planning on using a analog MAF from a 4.0 or 5.0 ford. That also keeps me from having to build a D/A signal converter. Also how can I make a tunerpro ecm and bin file from a ASM. that was sent to me? Usually I work with tunerpro, so this source code is new to me.

Also need to find info on going rom(less).

 

This link has a bunch of info in it:

https://www.thirdgen.org/techbb2/sho...hreadid=217206

Once you get the schematics note that three A/D inputs are tied to ground. On the bottom of the board those three pins are tied together. Cut the traces between those pins (two cuts).

This frees up two of the A/D channels, the third stays grounded. Run the open A/D channels to pins B11 and B12 on the ECM harness connector. Follow what GM did for input filtering (as in the schematics).

RBob.