I haven’t done any e85 tuning so, can’t help there. With the iac, I’ve seen them run from 75-300hz. I think it’ll take whatever you give it. If you have idle issues then I’d play with that and see if it clears up any. I know the higher hz will make the valve hum.
Thanks for the advice!
I found some info on the Holley forums last night and did some tinkering.
Swapped in a fresh set of TR8 spark plugs.
Then I drained all the 93 out, poured some E85 in it.
Next I swapped out the defective Holley fuel pressure transducer that was constantly showing 95# with a new replacment and it shows proper fuel pressure now (around 40#).
A few tries to get it to start and it fired up and settled into a nice idle.
It was slightly richer than I targeted, but I suspect it is the cold start fuel add built-in there in the base tune (I haven't changed any of that yet).
It ran really well, and I mean SMOOTH with zero smoke out the exhaust and no extra fuel smell.
Target A/F on E85 at idle is 9.5. As you cand see when cold it is adding more fuel keeping it around 7.9 to 8.5.
I also have the ignition timing set for 30 degrees total with 16 at cranking/startup.
But about the time it got up to 160 degrees, when I suspect the IAC starts to diminish it's influence on the idle, it died.
I could crank it back up and it ran for a second and died again, only running if I tried to feather the throttle.
Not sure if it's the IAC settings I need to manipulate more or something else.
Here's what my gauges were showing as it was coming up to temp right before it started having this issue.
It was definitely going LEAN right before it was cutting off.