11.26.2012

taking a few steps back.

Spent part of Thanksgiving night and the first half of Sunday in the garage digging around on the Buell. On Thursday, I swapped in the loaner ECM and reset the TPS, the bike fired up and I took it for a test ride. About 2 miles away from home, the fuel light came on so I decided not to go too far. After exiting the freeway on to surface streets, I thought I felt that same slight surge or hesitation. Almost like some invisible force is pushing back against the bike. Thinking it was all in my head, left over paranoia from the break down, I kept riding and decided to fill up the frame.

With a fresh 3.something gallons of 93 octane sloshing around betwixt my legs, I headed towards home. The slight surge/hesitation/stumble I felt before was back, now growing stronger with every minute that passed. It became an almost "bucking" sensation from the bike that was not reflected in the tach. Like it was missing or not firing on both cylinders. The CEL (check engine light) did not come on, nor did the bike throw a code via ECMSpy. Keep in mind, this is with the loaner ECM. So, now it has acted up with both ECMs after the TPS reset.

After I stumble the bike home(that's another good description of how it feels, a stumble) I decided that I must have done something wrong. So, on Sunday, I set out to reset the TPS and AFV again. It was much warmer and the bike acted up much faster than on Thursday night. Plus, after all the test running, the Uly peed precious high octane gasoline all over the floor. Clogged fuel vent? Could that be it?

Perhaps a more basic issue? A sensor feeding the wrong data back to the ECM? TPS? CPS? PBS, wait, what? What about a fuel issue? Both injectors test fired properly. It seems to act up once it's up to running temp. What about a plug wire?

On lunch today, I'm headed towards South-side Harley Davidson to pick up plug wires. I would rather support American Sport Bike but I want to rule this out now (and not pay for shipping).



Here's a video of the Uly running (poorly):

video


**UPDATE: The issue was caused by a failing TPS Sensor!**


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