Quote:
Originally Posted by JeffP-Z
So I switched over yesterday to try and test. I ran the car down to as far on empty as I could, which was no longer registering a distance on the miles till empty, filled it half way with E-85 and drive about 50 miles, then filled it back up to full with e85.
This car is running fine, except it threw a code (U0164 Lost Communication With HVAC Control Module, CAN Communication Error) which I am not sure is at all related.
What didn't happen as I expected, the OBD2 never changed from fuel_type = GAS. I would have expected it to switch to E85, Ethanol, or similar.
How does the ECU know I am now on E85 and not 93 to use the different fuel map? [/b] I have not had it tuned on E85[/b], obviously, and will do it after my Berk test pipe arrives Friday and is installed. Just curious if this is a workable situation or do I need to get one of the E85 kits from Zspeed, CZP, or Z1?
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The OBD PID for "fuel type" does not indicate what fuel is in the tank, it indicates what fuel type the ECU is programmed for.
The ECU has no idea what fuel type is in use, since the car isn't designed for it, it doesn't have a ethanol sensor.
With the E85 in the tank and a stock ECU I would think the engine is running lean. The target air/fuel ratio (stoichiometric ratio) are very different: Gas 14.7:1, E85: 9.8:1