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I have a mercruiser mag mai going into guardian mode and the
I have a mercruiser mag mai going into guardian mode and the dealer scanned it but there was no fault codes… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
2001 5.0 mercruiser water pump sheared off motor, temp only
2001 5.0 mercruiser water pump sheared off motor, temp only went to 175 but motor would only run low rpm, is that guardian mode or did I hurt the motor … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
I have a 2014 Mercruiser 5.7 fresh water cooled. It
I have a 2014 Mercruiser 5.7 fresh water cooled. It overheated yesterday. I put a gallon of coolant in tonight and ran it. It stayed at 160-170 at dock idling for 15 minutes. I took it for a ride and … read more
Jason
Jason
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Vocational, Technical or Trade School
18,955 satisfied customers
2005 Mercruiser 350 MAG MPI Horizon, engine SN ow370674,
2005 Mercruiser 350 MAG MPI Horizon, engine SN ow370674, transom SN ow461799, Bravo*****SN ow285790. Engine starts and runs fine at the dock. As soon as I shift into drive (fwd or rev) and rev above i… read more
Charles
Charles
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I have a 2008 496 mag with a B1 that i got stuck on a
Hi, i have a 2008 496 mag with a B1 that i got stuck on a sand/mud bar today and now it has a constant warning beep and very reduced power. i turned off and started it again and no beep until i got on… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
Background. mercruiser 6.2 mpi 377 . bravo 3, ser 0w004265,
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Jason
Jason
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Vocational, Technical or Trade School
18,955 satisfied customers
Engine SN: OW673430, mercruiser 5.0 MPI, drive serial num OW927662.
engine SN: OW673430, mercruiser 5.0 MPI, drive serial num OW927662. use boat in saltwater, engine is open cooled system using seawater for cooling. Temp are running between 185 and 205 on gauge on boa… read more
Tan
Tan
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Certified Marine Technician
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2004 cruisers yachts 340 express with mercruiser 8.1s Horizons.
2004 cruisers yachts 340 express with mercruiser 8.1s Horizons. I have Mercury Smartcraft. Alarm went off Saturday with wtaer pressure indicator and engines went into guardian mode trying to figure ou… read more
Jason
Jason
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I have twin 454 Mag MPI Horizon engines in my Carver 405. How
I have twin 454 Mag MPI Horizon engines in my Carver 405. How do I winterize them in the water?… read more
capt ron 1959
capt ron 1959
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Vocational, Technical or Trade Scho
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I have a 2004 Mercruiser Mag 496 with about 245 hours on it.
I have a 2004 Mercruiser Mag 496 with about 245 hours on it. Lately I have been getting 2 beeps per minute alarm. For a while the beeps stop but then come back. I connecetd a Rinda Mercruiser Scan too… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
Hi there I have a 5,0 Mercruiser MPI with a alpha one drive
Hi there I have a 5,0 Mercruiser MPI with a alpha one drive with seawaterpump in it. I would like to modify the seawater system and install an engine mounted drivebelt driven seawaterpump. Can I use t… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
2004 8.1 horizon - overspeed alarm after operation at 1,500
2004 8.1 horizon - overspeed alarm after operation at 1,500 + rpm. replaced crank sensor, still getting alarm. oil prssr good, water psi good, no heat, rpm constant, transmission feels fine, prop chec… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
I have a Mercruiser 350 MAG MPI, having problems with a constant
I have a Mercruiser 350 MAG MPI, having problems with a constant beep at 3000+ RPM and it going into Guardian Mode. I've changes the cap, rotor, plugs, wires, impeller, oil, checked all connections, b… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
I have a mercruiser SN 0L610962 V8 5.7 l I have now the problem
I have a mercruiser SN 0L610962 V8 5.7 l I have now the problem that if I do a fast reducing and increasing of speed I got an alarm. The alarm also comes when I run on XXX rpm and for ? reason I have … read more
Jason
Jason
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Vocational, Technical or Trade School
18,955 satisfied customers
I just bought a used 2002 SeaRay Sundeck 220 with the 6.2 mpi
I just bought a used 2002 SeaRay Sundeck 220 with the 6.2 mpi mercruiser and Bravo III outdrive. We love it. However, at about the 4th or 5th hour of the 7 hours of engine time we have logged since th… read more
James
James
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Vocational, Technical or Trade Scho
4,094 satisfied customers
I have a 2005 Sea Ray320 Sundancer-T-VD 350 Magnum MPI Horiz
I have a 2005 Sea Ray320 Sundancer-T-VD 350 Magnum MPI Horizon-300hp-224kw-the circulating pump on the starboard engine stopped working and antifreeze leaked out of the hole as it was designed to do-w… read more
Jeremy R.
Jeremy R.
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2007 Formula, 496 with fresh water cooling has low water pump
2007 Formula, 496 with fresh water cooling has low water pump pressure. 60 hrs.total engine time, replaced impeller, transom grommet OK. Brass housing looks to have heated up but no scoring or burn ma… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
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I have a 2006 Mercruiser 5.0 w/ Bravo III. The engine stalls
I have a 2006 Mercruiser 5.0 w/ Bravo III. The engine stalls at idle after being run 30 minutes or so. The engine will not start again until it has apparently cooled down. I have hade the entire fuel … read more
capt ron 1959
capt ron 1959
Owner/Marine Mechanic
Vocational, Technical or Trade Scho
348 satisfied customers
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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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