You should get a code 12 and the fans turn on when scanning the ECM. Have you looked at your ECT sensor on the scanner and not what the temp is on the dash. When they go bad they usually default to -40 degrees which requires a ton of fuel to run the engine. It could be the ECM no doubt but I would check that first and if it is good then I would go for the ECM. There really is nobody that is building them now, it is something I am working on but it it going to be at least a year before I am anywhere with it. I would look at the modified version that is programmable from Dynamic EFI. It will plug right in but you will have to repin some wires because it is going to convert it to MAP and get rid of the MAF sensor. You will be able to program it and they are pretty easy and straight forward to do.

 

We bought an ecm and that seems to have made things better. The code 12 issue is resolved and our plan now is to see what we can now learn with the scanner. Thanks for the input.. The ect sensor will be one of the first things we check!

 

If there is a prom issue let me know, I can fix those.
Justin

 

Good News! We replaced the ecm and immediately could tell the motor was happier. It still ran really rich, but it seemed to be "adjusting" the longer it ran. The crowning moment occurred when we decided to take it on a run through the neighborhood. The car had been operating rich for quite some time and "blowing out the exhaust alittle" seemed like a reasonable idea.. The first blast was pretty smokey and we expected that. The next one cleared up pretty quickly and the motor seemed to be running much better. By the time we got back home, it was running great! Idle was strong, acceleration dramatically improved and it acted like there was nothing wrong with it. At this point, I'm guessing that the ecm was an issue.. Whether it was responsible for enriching the engine or was simply performing according to a very suspect set of long term trim variables we might never know. The scanner now seems to work providing DLC codes but, it won't connect to provide real time variables. Either way, the car is running great and the teenaged new owner is overjoyed! I have to give him credit for patience.. For quite awhile there neither their wrench-head neighbor (me) or his hard working father held much hope that this story might have a happy ending!! Thanks to all of you for your interest and advice during all this. You folks are the best kind of humans.. you are all Corvette owners.. Many, many thanks from ALL of us here!