Merc 250 Verado Fuel increase

[alldodge]

The starboard motor has the higher psi and FMS was replaced more than a year ago. Starboard is doing fine other than the low voltage alarm which is another issue

Both cowls have paint along with stern of boat. Will take more pics but on my way to sisters in KC MO, will ne back late Tuesday

 

[alldodge]

I'm at my sister's in KC until late Tuesday, appreciate communication and will respond after that

 

[muc]

Something that popped into my head, it doesn't fit with the vibration you experienced. But might be something that could effect the unequal fuel burn.
Your engines have software called ARO --- advanced range optimization.
This will adjust fuel and spark when certain parameters are meet.
When this is operational it won't be felt by the operator or show on the Smart Craft screen, It's only visible with a scan tool.
Next time your at your boat, maybe connect the Tech Mate and look for something along the lines of "lean burn control state".
Maybe one engine is going into ARO and the other isn't?

 

[alldodge]

Well I messed up a bit, searching for NGK LKAR7C-9 which is part number 93961 I would up with LKAR7C-8 and doesn't list NGK

Looking at plugs it list -9 has 9mm gap (0.035) and -8 has 8mm Gap (0.031)

Going to contact amazon and get a refund