m_stock10506
Well-known member
This is the result of working on my R1100RT, and a friends R1100R. My 1100RT has always been a smooth running bike. I have always performed my own maintenance and valve checks and throttle body syncing was always done very carefully.
Last year the bike developed a pronounced surge and additionally the bike would stall when the clutch was disengaged suddenly, and the idle was very irregular. Valve adjustment and throttle sync didn’t help. I’m sure that I tried a few other things as well. I tried removing the cat code plug, which helped the run issues a lot, but I didn’t like that as a long term solution. Removing the CCP causes the bike to run richer which made me consider how else to approach that.
Raising the idle voltage of the TPS will cause the ECU to make the mixture richer. When I checked the TPS, the idle voltage was 331 mv, which really threw me because when I previously checked it was around 360. I adjusted the setting up to 385 mv, and checked it carefully and repeatedly. I have ridden the bike twice for about 275 miles, and it was transformed. The surge is just about gone, I don’t have to hold the throttle to keep from stalling. Running performance seemed to improve on the second ride. Gas mileage seems to be unchanged. I might bump the TPS up a little bit more, but the ECU has an upper limit of 400 mv before it throws a fault.
My friends 1100R was a much more involved problem. He had terrible running issues, and an incompetent independent tech did some really bad work. But in the end adjusting the TPS idle voltage brought his bike back to smooth running.
Based on the difference between the 2.2 and 2.4 ECU (1100/1150), I have no idea if this adjustment will apply to the 1150 bikes.
Last year the bike developed a pronounced surge and additionally the bike would stall when the clutch was disengaged suddenly, and the idle was very irregular. Valve adjustment and throttle sync didn’t help. I’m sure that I tried a few other things as well. I tried removing the cat code plug, which helped the run issues a lot, but I didn’t like that as a long term solution. Removing the CCP causes the bike to run richer which made me consider how else to approach that.
Raising the idle voltage of the TPS will cause the ECU to make the mixture richer. When I checked the TPS, the idle voltage was 331 mv, which really threw me because when I previously checked it was around 360. I adjusted the setting up to 385 mv, and checked it carefully and repeatedly. I have ridden the bike twice for about 275 miles, and it was transformed. The surge is just about gone, I don’t have to hold the throttle to keep from stalling. Running performance seemed to improve on the second ride. Gas mileage seems to be unchanged. I might bump the TPS up a little bit more, but the ECU has an upper limit of 400 mv before it throws a fault.
My friends 1100R was a much more involved problem. He had terrible running issues, and an incompetent independent tech did some really bad work. But in the end adjusting the TPS idle voltage brought his bike back to smooth running.
Based on the difference between the 2.2 and 2.4 ECU (1100/1150), I have no idea if this adjustment will apply to the 1150 bikes.