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Another thought.
Some Yam models having an IAC valve also have what Yamaha calls the Variable *****ing System (VTS). A switch tells the ECU to raise or lower the idle RPM in 50 RPM increments, in which case I presume the ECU sends a ground to the valve to tell it to open or lower a tad. I think.
If the valve were not responsive as it should be, maybe the RPM change would not occur as it should. Could VTS be used as a trouble shooting procedure for the valve? A crafty fellow like our very own Mr. Fairdeal could quickly prove this theory to be busted, plausible or confirmed.
Some Yam models having an IAC valve also have what Yamaha calls the Variable *****ing System (VTS). A switch tells the ECU to raise or lower the idle RPM in 50 RPM increments, in which case I presume the ECU sends a ground to the valve to tell it to open or lower a tad. I think.
If the valve were not responsive as it should be, maybe the RPM change would not occur as it should. Could VTS be used as a trouble shooting procedure for the valve? A crafty fellow like our very own Mr. Fairdeal could quickly prove this theory to be busted, plausible or confirmed.
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