Can anyone point me me to a good reference source on GM TBI injection? I'm having a hell of a time getting detailed information about how the system works. I'm an electrical engineer by trade, so I don't need the details to be watered down. The main area I'm really lacking good info is in how the block learn factors are computed and applied. Somewhere the engineers at GM must have created a flow chart showing how the ECM software works.
Short of the total detail I want, maybe someone can answer these questions for me. How many VE table entries are there? Are the RPM and MAP ranges programmable, or just the values inside? Is there one BLM value for each VE table cell (or fewer or more)?
I'm trying to understand why getting the VE table perfect seems so critical to everyone. On the surface, it would seem that if the engine would at least start, assuming there was one BLM for each cell, that the system would eventually compensate itself and everything would be perfect (as long as you didn't disconnect the battery). If you had a dyno and a laptop, you could go to each cell and dwell there for a minute to let the BLM settle out. What am I missing?