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I have a 2006 MerCruiser 350 MAG MPI Horizon Engine with a
I have a 2006 MerCruiser 350 MAG MPI Horizon Engine with a Bravo Three Sterndrive (Engine Serial 0W620281). PCM is triggering Guardian Fault around 3000 RPM consistently. Used Rinda Tech's TechMate Pr… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
I have sea ray 24.5 with 5.0 mercruiseri have warm water in
I have sea ray 24.5 with 5.0 mercruiseri have warm water in bilge but it is come from hole in fibrglass trasom on port side 300ml up fom bottom of bilg … read more
Boat Doc
Boat Doc
252 satisfied customers
When i turn the key to on - a horn comes on and stays on.
when i turn the key to on - a horn comes on and stays on. when i start the engine, the horn goes off. Engine runs normally to 2000 rpm, but will not go higher, no matter what the throttle position is.… read more
Boat Doc
Boat Doc
252 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
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
I have a 2007 496 Ho mercruiser stern drive, while running
Jason I have a 2007 496 Ho mercruiser stern drive, while running the boat at high rpm she went into guardian mode. I had to drive back to the dock at 1000 rpm to keep the alarm off. I took the boat ou… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
Guardian mode on 2006 mercruiser 350 mag horizon mpi with closed
Guardian mode on 2006 mercruiser 350 mag horizon mpi with closed loop cooling. After about 30 minutes of running at any speed, it throws a continuous alarm and goes into guardian mode limiting RPM to … read more
briggs archer
briggs archer
master marine mechanic
Associate Degree
374 satisfied customers
My question is about "Block Pressure" readings and probable
My question is about "Block Pressure" readings and probable source of a water leak. I have a 2002 Regal express with twin 4.3 MPI seawater cooled MerCruiser engines with analog gauges, Bravo III drive… read more
James
James
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Vocational, Technical or Trade Scho
4,094 satisfied customers
Where does my Alpha one discharge the raw water after it takes
Where does my Alpha one discharge the raw water after it takes it in from to lake. engine running about 200 deg no sign of warmer water leaving lower unit. Is my pump not moving any water?… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
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I have a 2005 Mercruiser 5.0 on my Bayliner 210 Cuddy. Pulled
I have a 2005 Mercruiser 5.0 on my Bayliner 210 Cuddy. Pulled both drain plugs on this motor last fall, and when I started the motor this spring, it started and ran smoothly, but the freeze/cast plug … read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
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I have a 2005 Bayliner 275. Yesterday I was running for a
I have a 2005 Bayliner 275. Yesterday I was running for a solid hour at 4K rpm, after idling a 1.5 mile No Wake Zone, my boat overheated. Water Temp gauge was maxed out, alarm sounded. I turned the en… read more
Scott Martin
Scott Martin
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Vocational, Technical or Trade Scho
167 satisfied customers
I have a VIP Valiant with a mercruiser 4.3 inbd, I started
I have a VIP Valiant with a mercruiser 4.3 inbd, I started the engine with the rabbit ears and heard a squeal, took it to the lake and theengine bay filled with water. The plug was in and at first the… read more
Whitecap36
Whitecap36
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Vocational, Technical or Trade Scho
1,556 satisfied customers
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
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Vocational, Technical or Trade Scho
1,031 satisfied customers
2nd attempt with your service. The PCM unit goes into guardian
2nd attempt with your service. The PCM unit goes into guardian mode 8 minutes after opperating. Re-start and runs 8 more minutes. Replaced all sensors, checked pressure & temp. Last mech told me for $… read more
John White
John White
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Vocational, Technical or Trade Scho
306 satisfied customers
Hello again!, Tonights question is Have I damaged my newly
Hello again!, Tonight's question is "Have I damaged my newly rebuilt Mercruiser engine?" Both of my "Big block" Mercruiser engines were rebuilt last summer. During the winter I often run them while st… read more
Scott Martin
Scott Martin
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Vocational, Technical or Trade Scho
167 satisfied customers
Have a 2002 Cruisers Yachts 3275 with twin Mercruiser 5.0L
Have a 2002 Cruisers Yachts 3275 with twin Mercruiser 5.0L MPI Alpha's. The port engine will stall when it has a load on it over 2400 RPM's. It sends no engine trouble light ot tone and shows no fault… read more
capt ron 1959
capt ron 1959
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Vocational, Technical or Trade Scho
348 satisfied customers
my volvo penta 4.3 engine is overheating at high rpms. Gauges
my volvo penta 4.3 engine is overheating at high rpms. Gauges are fine, and nothing appears wrong at idle or up to about 3000 rpm. But after my spring tune up (fuel filter, oil change, new plugs, new … read more
ROCKET
ROCKET
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Vocational, Technical or Trade Scho
426 satisfied customers
last week I drained and refilled my lower unit on my merc 5.0
last week I drained and refilled my lower unit on my merc 5.0 stern drive. tonight when I checked my boat I could smell gear lube.and there was a fair amount in my bilge. how can it get in there. can … read more
Larry B.
Larry B.
Marine Service Tech
High School or GED
574 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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