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Hot Engine No Start - Temp Controllers
rinker270nb
Member Posts: 207 ✭✭✭
For 3 seasons I have had a no-start when engine is warm scenario, I am finding more info on it as it is somewhat common, especially in warm water environments. This means when engine is cold, it starts right up. Turn it off and sit for a while, it won't start and I need to give it some throttle to start. This is a 2015 Merc new repower w 383 Stroker. I am reading that the temp read is to high by ECM and to change either the thermostat, Temp Sending Unit, or Therm Temp Sensor. Does anybody have experience with this or have thoughts of the best path to pursue. Each part runs about $30, easy fix if it does fix the problem. (This isn't a vapor lock issue as it starts when given throttle.) Thanks for your help here...!
Comments
make sure the filter on the IAC is clean, too. it should adjust even for that, but you may be at it's limits if it's dirty.
they get dirty just like the throttle body. they should be cleaned, but be careful not to move it around much when you do as it is possible it will lose its position map. it 'should' find it again, but... many failures are reported right after 'cleaning' them and moving the valve.
you'll know when you need to replace it. starts will become difficult without opening the throttle a little, and idling will become choppy low or too high ( <650rpm or >800rpm )
this circumstance is so common with more-than-some that it may be something that merc should look into insofar as their tables hard scripted into the ECM.