| Author | Message | ||
     Rotorhead |
With all the new improvements in ECMSPY can it fix the natorious 3000 RPM hicup? Maybe I have missed the fix along the way or is that we all just decided to live with it and drive faster. | ||
| Ft_bstrd |
Excellent question!  | ||
| Johnboy777 |
Hey Rotorhead, Sounds like you have ECMspy - have you tried Treadmark's square idle? I have a custom Xopti EEPROM, along w/ Tread's square idle and the combo has really helped, but not entirely eliminated, with the hiccup/sneeze/cough I had accelerating off idle. It drove me crazy! John | ||
| Treadmarks |
Morning fellas, The dreaded stumble... If everything else is in good order (timing mechanically straight up, no intake leaks, good plugs and wires) then it can only be a fuel or timing issue. There is a difference between a 3k stumble and an off idle hiccup. You have to identify exactly which it is. I have had both with different maps. In the beginning I thought I had a 2500-3000 stumble, but it was actually an off idle hiccup. By the time I recovered and looked at the tach, it was higher than the hiccup occurred. Next time it happens, identify where your throttle position is and exactly what rpm it occurred at. Park the bike and leave it running with a fan on the heads to keep it cool. Connect to your pc and load the new version of ecmspy. Fetch your fuel map from the ECM. Select the fuel map tab. Uncheck the group cell feature and check the blue dot feature. This will allow you to see exactly which cell the motor is using when the engine is running. Now slowly duplicate the throttle position and rpm where you had your stumble or hiccup. With my setup, my hiccup was just off idle, so I followed the blue dot as I duplicated the hiccup. This showed me exactly which cell was the problem. Add fuel just to that cell and burn it to the ECM. Switch bike off, restart it and take it for a test ride and notice any changes. If the problem did not go away, repeat above procedure until situation improves. Not all issues are fuel based as timing may have an impact, as well as air temp and engine temp. My square idle my also have an impact on the off idle hiccup due to the fat idle to lean map transition. The square idle is normally lower than the factory idle and intake reversion may also be an issue. This weekend past, I changed my cells as indicated above. The motor sounded perfect in the garage. Went for a two hour test ride, both on and off road and could not induce a stumble no matter what the situation was. I tried pulling off from a stop with no throttle, some off road idling in first while using the brakes to load the engine and dozens of pulling out in traffic...no stumble or hiccup at all. I let the bike cool completely and tried to start it...It barely started and was way too rich. It would barely run in the areas I adjusted. The cold start fuel enrichment was now way off.  I am working with my tuner to identify a solid solution for the issues. It looks like I will need to set up the fuel map to eliminate the hiccup when the engine is up to temp, then adjust my percent cold start enrichment map to maintain good cold starts and drivability. I am open to any suggestions from those that are more familiar with maps, eeproms and ecmspy. TM | ||
| Uly1080 |
In my tinkering, I've only noticed a hiccup when the AFV becomes skewed as a result driving down hill in overrun for extended periods, rain, etc. I've often reset the AFV after such riding conditions, allow everything to re-learn, and then BAM! no hiccup/sneeze/cough to be seen/heard/felt. | ||
| Classicbuells |
I'm impressed that you can see it like that in ECMSpy. | ||
| Rotorhead |
I have a stock 06 ECM and a race ECM and they both do the hicup at 3000+-100 RPM. It seems to do it in the closed loop operation. I'm going to logg while i ride to try and capture the hicup under driving conditions. I have tried to reproduce it on the side of the road and at a dealer but couldn't do it when the bike wasn't under load. BTW the dealer did the "Yup the Buells do that don't know why? Let me know if you figure it out.". I tried to do it at lunch but the warm up on the way home the engine got to warm to produce the hicup. It may be the AFV thing and adjusted on the way home also. only a good data logging will give me a good answer. Anyone know how to read the data log? or a instructional paper on how to? | ||
| Blake |
Sounds like your bike has issues. Maybe a TPS reset is indicated or a leaking intake manifold seal. | ||
| Rotorhead |
The hicup isn't a issue just something to farkel with and maybe fix. The bike has always run like a charm and wouldn't trade it for anything else. I think there is shall we say rider performance preference that every rider is looking for. For me I'm looking for smooth predictable delivery of the massive low end torque and HP. To get ride of the hicup @ 3000 RPM would keep the wife from head butting the back of my helmet when it does happen. | ||
| Nipsey |
I don't have the hiccup - 06 with race ecm, 07 airbox and Remus. Have not done anything with EMC Spy other than look at the pretty graphics. Bike pulls strong and smooth from just about 2500 RPM until that annoying rev limiter thingy.... |
