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I follow Don's recommendation to the letter as posted...

--High traffic station
--top tier only
--87 only
--under 10% ethanol

My engine has not seen a drop of non-ethanol since new in Feb...

That's really hot, hope no engine damage occured.

Sure is and Guardian is activating to stop the abusive overspeed throttle input in neutral. You should never apply throttle above idle when in neutral.

Since I have a level 2 Mercmonitor I'm not well versed with VV, but there should be a settings menu of some kind, make sure coolant temp is set to on or selected.

:yesnod:

What is your coolant pressure at idle? Thermostat fault codes are most likely from debris in thermostats, remove/inspect/test them before running engine again.

Thermostat removal/replacement for...

Bump again!

Guys please take a moment to ensure you post your engine questions in the appropriate forum. Note there are 4 Mercury forums and 2 sticky topics in this forum to direct you to the...

^^^^This^^^^

Mercury - 3 Liter & 3 Liter High Performance

Your engine is a 3L and covered here - Mercury - 3 Liter & 3 Liter High Performance

4-stroke forum here - Mercury - 4 Stroke / Verado

4-stroke forum here - Mercury - 4 Stroke / Verado

Lapping cages from the FAQ - REED CAGE LAPPING

+1. The only thing the beep pattern tells owner is whether it's a critical (solid tone) or non-critical alarm.

Same here.

Rebuild kit should be fine IMHO.

Great to hear of your results!

The X-900 is "NLA" and BassPro does not provide battery specs for this new one in the description. :rolleyes:

I blew the gp31 pic up and the label says 772 or 773 CCA so that doesn't meet minimum...

VesselView is accurate, and that's low, you should be seeing 13.8v minimum at idle.

+1. Once the poppet opens the stats no longer control engine temp, this is why it's critical engine coolant temp reach at least 120° prior to accelerating.

Screen is probably clogged with bits of liner, if you've never replaced the pulse pump, now would be a good time to do so.

One commonality among the many recent posts on this also includes a deck fill.

Could be the neutral safety switch in the shifter. Next time it happens try jiggling the shifter handle fore and aft a little, if you can get it to start that way replace the switch.

Telltale on an Optimax is the compressor cooling outlet only. At this point, your best course of action is to have the codes read.

There are many things that can cause a 6 beep alarm, only way to know is to have codes read.

Think I still have one after going to the Smartcraft float assy will check when I get home this afternoon.