Originally Posted by
DrkPhx
Cold start E85 tuning is hard to nail down. Have you tested the fuel to see what the actual ethanol content is? You would be surprised how much it varies. Something to consider is to increase the stoich to help compensate for the winter blend which has more gasoline and less ethanol. When I ran E85 I settled on 10.76 stoich for the "off months". It took a lot of incremental experimenting using the DVT controls to settle on this value. I'm not saying that value will work for your set up; but you should use that feature to help pin point the required fueling. Have you logged commanded AFR in the scan tool to confirm what the cold start AFR is? If it's richer than main commanded table; the adder/multiplier tables are probably adding fuel. Look at the Afterstart ECT Enrichment table which adds fuel on startup based on ECT. It's in EQ ratio (not lambda).