SG4247

I been driving daily in the OKC heat as well.

Never had a starting issue, unless there was some cheap 87 E10 in the tank, along with my regular E70, diluting it way down.

As long as the yellow gas is 65% or better, mine starts fine in the heat. If it’s below 65% I have to feather the pedal etc..

I don’t have a flex fuel sensor, so I doubt mine would start at all at 50%. It’s tuned for 70-80% Ethanol, or 91 Gas on a different map.

I have the fuel pressure right at 52 psi at the fuel block.

I can drive it all day with E70 in the tank, on the 93 gasoline map, it just runs lean. Still makes good power too! NA motor, so knock is the risk here.

It wont run at all with 91 in the tank, on the E70 map. Way too rich apparently.

So, check your AFR and see if it’s in line with what you expect. I know my AFR will be way off if the E content is off, since I don’t have the flex sensor.

If the AFR looks ok, then probably something else is going on. Maybe your flex sensor is bad?

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NA on E85 - 12.669 @ 110 mph (stock fuel pump)
100 shot E85 - 11.589 @ 117 mph (DW fuel pump)
JWT C2 cams rev Base Circle & Titan Valves