200 ox66 idle

[GW267000]

I have twin ox66 200’s. The port engine on muff will idle at around 14 even after wormed up, while the starboard will idle at around 9 after warm up. Ox sensor on starboard will run up to and vary from .11 to .14 while the port will run up to and vary from .070 to around .077. The starboard has always done this so while doing maintance (new impeller,thermo stats,pressure valve,ect) cleaned both OX sensors and changed which motor they were on will same results. After running to the fishing grounds each motor has always idled correctly under load. Does this sound like something to be concerned about?

[rodbolt17]

O2 sesnor output CANNOT be correctly checked on the muffs.

[GW267000]

Did not know that. Just looking for a reason for a higher idle.How would you do a safe check while under way? Thanks For the reply.