Off idle stumble 2014 Cross Country with PCV and AT
Hey all, I'm working on attempting to eliminate an off idle stumble that my 14 XC is suffering from. This is not a "blip the throttle" stumble, although you can make it do that too. This happens periodically (no really set pattern) once the engine is hot. I'll pull up to a light and wait for a bit, and when I ease into the throttle to clutch out in first hear, the bike will hesitate and *almost* stall. This happens when the bike is hot, and not very often, but enough to be annoying.
My mods are as follows:
Stock ECU (no stage 1 flash)
Vic performance filter
Witchdoctor baffle muscle mufflers
PCV with AT
Now, just so you all know, it was doing this *before* the PCV and AT. Now that I have the PC, I am looking for a way to tune that issue out. I have played with several different AFR tables (a couple from members here), but for simplicity sake, I'm currently running the bit too rich dynojet AFR tables. This allows me to compare to my friends 13 XC with a PCV and AT. He doesn't seem to have this issue, but he started with a stage one flash *before* he went PCV and AT.
The PCV and AT took care of all of the low RPM and low speed lean surges that the stock ECU suffered from, so I am happy in that regard. Right now I am just trying to learn more about the PCV and AT to see if I can correct that issue. So far what I have done, which seemed to help, was input AFR's into the 0 throttle column from 500 RPM to about 1750 RPM, and I also put AFR's into the 750 RMP row up to about 20% throttle. This seems to have helped, but didn't eliminate it entirely. In checking the trims I don't see much activity in those cells, so I'm not sure if that is the real issue.
What I am trying to figure out is what actually causes the stumble? Is it caused from being too rich at one point and then leaning down too fast when throttle is applied, or is it the other way around?
I'm looking for anyone who has just a PCV or a PCV with AT who is familiar with this issue and was able to solve it.