CB1100 Idle speed instability problem

[max]

Riko, thanks again for your help, having looked at all the clues we have up to this point my suspicion is that we are looking at a tps fault that creeps in over time in a small batch of bikes.

It explains why it takes some time before the fault appears and slowly gets worse.
It explains why it sometimes initiates after driving in a hot situation.
It explains why a wot reset works but only very briefly.
It explains why the kill switch reset works but only briefly.
The bad spot is still there and wears out more over time.

It may be that honda has difficulty finding the fault because their sensors give very little problems due to good engineering ( speculation ) and are not familiar with the problem.

The next problem is the diagnosis itself, even a technician with an oscilloscope would have difficulty finding the bad spot on the sensor, let alone a digital multimeter for this purpose, and because the sensor still reads mostly ok there is no fault code, the ecu does not look for a spotty reading, it only registers very low or high ( wiper broken ) voltage before it sets a code.

So the replacement of the tps or the body and do an a-b comparison is the best test i can come up with so far.

cheers max