HI, I have a 95 Corvette LT1 Auto that I would like to learn how to tune. I've done alot of reading and purchased a cable from Reddevilriver. I can get Scan9495 to work just fine but thats the only software that I can get to work. I understand that I need Cats winflash to do any type of reading or programming to my PCM. Once and only once I was able to get it to read the vehicle type. I cant get any connection at all since that one time. I get "Invalid responce from PCM".
I have tried Tunerpro V5 as well, I at one time had it reading but the dash gauges were jumping all over the place.......garbage info.
I did the compatability install and run as administartor on winflash, no help. I have re-installed drivers, checked com ports, changed com ports...etc.
I also have another PCM from a 95 Roadmaster, I plugged it into the corvette and tried to communicate with it and got the same result.

Im at a loss as to where to go from here. I must have the winflash to make any changes.

Anyone have any suggestions on how to make them talk?

Steve