I have been out running scantool/datalogger runs on my car trying to get my B/L tables nailed down...and for the same airflow values my block learns will bounce all over the place...it seems like as my car get's hot(as I sit and let it idle while recording blm values in my notebook) that the car runs richer on the next run...

What is causing this? I 'think' that as an engine get's hotter, it needs less fuel...but I had the thought that maybe the car was getting hot enough to turn the 'highway spark mode' on...but that can't be right because I am seriously jacking with the throttle as I make my runs...

What's the deal? What am I missing. I have the EGR on...but other than that...is it something to do with the highway spark mode? Or is it another table that I'm missing.

I'm using Tunercat and a MPSI Pro/link scantool



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GregF
87 IROC