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overheat at idle

yamaha 40/60 jet asked on 8/7/2019 8:19:33 AM
2010 yamaha overheats at idle only
ECM controls idle speed , so cannot bump up idle rpm
i can cheat rpm at throttle body stop and bump up idle 150 rpm and no more overheat, but ecm will adjust idle speed control valve in a couple minutes as it tries to fix the higher rpm that i just cheated and it will overheat again
New waterpump, new t-stat
Cannot find restrictions in passages
Old impeller looked like new
Baffled !!!

 

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