The vehicle we are working on is a 1991 Buick Riviera: 3800 engine, Vin Code L, RPO L27 with ECM P/N 16141470 with BCC AXMU2583.

The problem is, that in order to make TunerPro work correctly, we need to locate and download the correct BIN, which we have been unable to find.

According to our research, the correct BIN would be: $5B3.bin.

We did locate and download XDF "$5B3 91 Buick-Pontiac L27 3800," and for the .ADX, downloaded "A112.DS," which we converted to .ADX using TunerPro.

The bin we need is NOT in the gmecm bin lib, or anywhere else we have searched, and we have done lots of searching and had numerous conversations that have brought no result.

So our question would be: how do we find this one missing bin? If we are unable to do so, is it then possible to substitute another bin that will perform without errors?

We also noticed that the TunerCat has the correct ECM definition file ($5B3) listed for their OBD1 Tuner, but that would be in their format (ecm.TDF) and not the .BIN format that TunerPro requires. So there's another question. Would the OBD1 Tuner from CATS be good for just diagnosing and troubleshooting?

Our goal here is to diagnosis what is kicking a code, rather than playing parts roulette.

Thanks for any advice or help, this really has us stumped.