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Alarm triggered when underway at speed
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My 2012 202io is in the shop as i type this for the same issues. Will let you know what they tell me.
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Mercury dealer got back with me and said Merc told him it appeared to be low water pressure - threshold too sensitive-and is sending to Mercury to reflash ecm ( other minor codes were low voltage and low drive lube-lube is ok). As far as being too hard to plane, we tried a 4 blade alum 20" pitch--that took 5planing down 5 mph and top speed down 5mph. I believe that I still need to reduce planing speed down 5 more mph, so I am trying a High Five 5 blade 19" pitch before I try SX Smart tabs. Anyone have any other advice? Thx
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Update on 2013 Hurricane 188 Merc 220 hp Alpha. We went with High Five 5 blade 19" prop and SX80 Tabs. It is like a different boat. Top speed went from 56 mph to 46 mph. Hole shot and time to plane greatly improved. Audible alarm issue went away with an ecm reflash by Mercury. Our boat has catalytic converters and OBD mil light and calibration needed fine tuning. Have put some hard hours on the boat and no issues. Only downside is that we have to be careful not to over rev engine.
