It seems that there are some kinks in my flexfuel tune. My sensor is reading properly..... Full e85 tank shows 80% alcohol (Vince says that's typical alcohol content in e85), and when I filled my tank with about 55% 91 premium, it reads 40%.
The problem is that when I come to a stop, the engine surges, then stalls.:blankface: I've been working with Vince to get this solved, but we're not making any progress after 2 updates.
Oddly, if I engine brake all the way down to about 1,000 rpm before I push the clutch in, the engine will idle fine when I stop. But if I just press the clutch in at speed, like I normally would coming to a stop, the engine revs drop, bounce up to 1,000 then drop way down to 600 and then stalls.
I'm wondering if Swordsmith had any issues with his initial flexfuel tune like this?
Sorry I was off working all weekend, missed this post.
I did not have this specific problem, but I did have idle and stall issues, and Vince had to play around with the tune a bit to get it working. I didn't run around on pure alcohol prior to doing the sensors, though, so I have no idea if things would have worked perfectly from the start if I'd done a full swap.
Our final conclusions were several different issues:
1) I had one faulty injector, which was causing missing and stalling
2) idle was too low, causing stalling on idle; bumping this up (after Smit did his) solved
3) Alcohol runs like crap in cold weather, until the engine temps get up over 80 or so. This wasn't a tune issue, but we didn't know this at first and spent a lot of time chasing it.
None of the issues seemed to be flexfuel related at all, I didn't notice any problem at E47 that I didn't have at E85, quite the reverse, the more gasoline I was running the less noticeable the problems were.
.
