11-15-2016, 07:54 AM
My CB developed higher idle revs when being warmed up without me knowing why.
Since summer I get used to it and talked to Honda engineers about this phenomenon. One gave me the tip to ignore it and take it as being normal. There are a lot of sensors interplaying with the ECU, but which one can be the reason the higher revs? Another engineer suggested to let the ECU reset by a honda dealer and if this will not cause any change, then a new program can be played into the EPROM, which was developed to stop the low rev idle problem. It may help.
I will do the first and maybe the second step next spring. All I found out 'til now is, the engine has higher idle revs when it is cold, 1.500U/min. Then, when the machine is slightly warmed up, the idle speed sinks slowly down to 1.050. So far so normal.
After a few more km the idle speed does not return from higher revs when I close the throttle to these revs, but stays at 1.500 as being cold. But I can bring the engine to have the normal idle speed again by either use the key off mode and then start the engine again. Or I slow the machine down in a high gear, which causes less then 1.500. Then the idle speed is normal. I often use the second method. The CB is somehow a machine of mircales and wonders. And it is a standard 2013 one.
Wisedrum
Since summer I get used to it and talked to Honda engineers about this phenomenon. One gave me the tip to ignore it and take it as being normal. There are a lot of sensors interplaying with the ECU, but which one can be the reason the higher revs? Another engineer suggested to let the ECU reset by a honda dealer and if this will not cause any change, then a new program can be played into the EPROM, which was developed to stop the low rev idle problem. It may help.
I will do the first and maybe the second step next spring. All I found out 'til now is, the engine has higher idle revs when it is cold, 1.500U/min. Then, when the machine is slightly warmed up, the idle speed sinks slowly down to 1.050. So far so normal.
After a few more km the idle speed does not return from higher revs when I close the throttle to these revs, but stays at 1.500 as being cold. But I can bring the engine to have the normal idle speed again by either use the key off mode and then start the engine again. Or I slow the machine down in a high gear, which causes less then 1.500. Then the idle speed is normal. I often use the second method. The CB is somehow a machine of mircales and wonders. And it is a standard 2013 one.
Wisedrum