1 Attachment(s)
AFV at 128% & engine cuts
Hi peeps!
After a ride today, it turns out my XB12 still needs some work. A bit of context here.
The situation
- When I bought it (less than a hundred miles ago), the engine won't feel so great and going over 4000 rpm would result in engine cuts, plus I'd hear a lot of after fire in the exhaust when the throttle would be released. Right before I bought the bike, the previous owner changed coil, wires and plugs. Didn't change much, I believe.
- The bike went through the full 25,000 maintenance, with new oil + filter, spark plugs and so on, plus a new O2 sensor and battery (Deka 220CCA). Right after, I started driving it more and it felt much, much better: the after fire almost stopped and most of the time no more cuts after 4000 rpm.
- Tonight I went for a ride, and once the bike was warm (with the fan going full speed), I experienced again the engine cuts after 4000 rpm and pretty intense after fire (at this point, not sure if it's back or after because of highway + earplugs, plus the very uncomfortable experience of the bike refusing to accelerate).
When I got my bike back from Bartels' in LA few weeks ago (for changing my fan and my fork seal), Mitsu told me the engine cuts could very likely be because of the K&N filter and Jardine exhaust, which require a more suited ECM map. I did get the specific map from Buelltooth, but they recommend checking the AFV level beforehand.
Therefore I plugged the Buelltooth to the bike tonight to check the AFV level, and it shows 128%.
Attachment 9433
The brainstorming
At this point, I would need some more help figure out in which direction I should keep digging. I did some research on the forum to get a bit more educated on the behavior of the ECM, the O2 sensor, the EGO and the AFV here. With this, I think I understand that:
- The ECM could be "responding" to the K&N/Jardine requirement with a richer set up to compensate for the bigger volume of air coming in and out. Thus, the higher AFV. But then, my brain gets limited and I am unsure of what a "specific" map would change, if the AFV can already increase the value of the entire map by already 128%?
- Am I misled by focusing only on the setup of the ECM? On Buelltooth "How-to", they indicate this could show an intake leak or faulty sensor. I just put a brand new O2 sensor, which leaves the intake leak open. I found the very interesting article from twin motorcycle in NL on the topic, their testing methods plus their new parts that seem to be less prone to leak. But I feel like I should close one topic before opening another one.
It would be great to read your thought about this!
Thanks :)
Max.