You can add mine to the list of affected bikes after taking a few more longer rides.
What is the year of your bike, current mileage and city/state in which you live?
2007, 3,800, Springdale AR
stock exhaust, no CO mods, no PC or other fuel mods.
Has your bike surged at altitude? If so, have you noticed any pattern as to a particular altitude the surging occurs?
I was going uphill on a long grade following another vehicle. When it started I was in 5th gear running about 55 mph around 1500 ft msl. After climbing about halfway up the hill, throttle response seemed sluggish. Opening the throttle further had no immediate affect, then after a short delay, the power came back as suddenly as it had gone (my wife asked if I was trying to throw her off the bike.). It felt to me like the engine was being temporarily starved of fuel. Took about a half mile to find a safe place to pull over. Topped the hill around 3000 ft and pulled over while going down about 2/10 mile later, but the bike appeared to fix itself on the way down. Has done a few times since the first episode under similar conditions.
Conditions the first time: about 20 minutes riding two-up since last shut down, 85-90 deg temps in river valley changing to 75-80 in the Ozarks. Humidity was around 70%. Probably done around 40 miles that morning before the incident with a stop for fuel about 15 miles before the surging incident.
Have you experienced surging while changing altitude of 1000' or more without shutting motorcycle off?
Yes, see above.
Have you experienced surging riding at a steady elevation? If so, what elevation?
No.
When you experienced surging did you try turning bike off/on? If so, did it correct the problem?
Yes and no. I turned the bike off shortly after the problem appeared, but the bike was acting normally when I shut it off. Other times I have experienced surging under similar conditions without shutting off, and surging also disappeared.
Have you contacted the dealer regarding the problem? If so, what has the dealer done to help resolve the problem?
No and nothing. After reading all of the posts where the dealers were told to bump the CO settings I figured it would be a waste of time, especially since the problem has only occurred about 10-15 times.
Has your bike surged at altitude? If so, have you noticed any pattern as to a particular altitude the surging occurs?Surged several times while riding the Blue Ridge Parkway from approx. 1,500 feet to approx. 3,800 feet altitude. Throttle must be locked or only have minimal changes. Downshifting two gears and working the throttle WFO several times caused the ECU to read new settings and corrected the issue. Tested this theory twice more in the same area and verified all the above as valid.
I think this may hold the key, every time this problem has occured on my bike I was riding at steady throttle while climbing, then hesitated/stumbled when more throttle was fed in. The problem for me is not the hesitation itself, but the sudden and somewhat unpredictable return to full power immediately following the hesitation. Hasn't been a big enough problem that I'm willing to leave the bike with a dealer, especially since there does not appear to be a solution as yet.
Is it possible to replace the 2007 ecm with one from a 2006? I only ask this because someone mentioned the they are different part numbers, indicating to me that there were changes made. The sensers appear to be the same for 06/07 models, so it would appear they would be interchangable. Since this particular problem doesn't seem to affect the 06 models nearly as much, it would seem that whatever was changed in the ecm was a step in the wrong direction.
David
