starboard runing cold!
 

Port motor gets temp just fine, starboard never gets about 105. Pretty much just sits there.
I feel its not the gauge, for two reasons. One it bounces when the key is turned, and most importantly as rich as the motor is running I KNOW it is running in cold mode!
Transom is black :( and i can smell the excess fuel :(

Everything visually looks fine, connections etc.
Getting water, all the manifolds are cool to the touch so that is all fine
I have not heard any alarms? should Ieven get one? Whould the codes show?
Could a thermo stat stay stuck open?
What are the thoughts here?
Btw, 1999 Stock Merc 502 mpi's

Guess its time to find the scan tool :( or software

thermostat

Sounds like your thermostat is stuck open. Better open than closed