CB1100 Idle speed instability problem

[dave]

I haven't kept up my posts to this thread because there is another thread on this exact same topic that I've been updating. To keep it short: My idle problem (1,500 RPM) returned, and stayed. Disconnecting the Engine Oil Temperature (EOT) sensor completely cured the high idle speed, but caused difficult cold engine starting, and the check engine and hot engine warning lights came on. I replaced the EOT sensor with a new one, but this did nothing to cure the problem. I tried disconnecting the battery (for 10 minutes) to see if this would reset the computer, but this didn't help either. I replaced the battery today (because it failed to restart my bike in an intersection that I turned the motor off in because I was tired of the 1,500 RPM idle), and magically my bike is running perfectly again. I only rode it for about 10 miles (at the low speeds / stop-and-go conditions that usually cause the problem), because it was beginning to rain, but it returned to a nice 1,050 RPM idle at every stop. I am NOT saying the new battery cured the problem because the high / low RPM condition has come and gone before, but I'll keep this thread posted if it returns again.