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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
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I have a SeaRay 375 Sundancer with twin Mercruiser MX 6.2 MPI
I have a SeaRay 375 Sundancer with twin Mercruiser MX 6.2 MPI petrol engines. In spite of comprehensive maintenance the problems are endless. How about other owners experiences? Barry Cager… read more
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we bought a used 2002 searay 185 bowrider 3 weeks ago and it
we bought a used 2002 searay 185 bowrider 3 weeks ago and it has an inboard 4.3 MPI mercruiser. on saturday after taking the boat out we noticed going over 3000rpm's a warning signal would sound. it w… read more
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Hello, I have a Mercruiser MPI 350. I have had a problem with
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Tan
Tan
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hi my boat has a 5.7 litre mercruiser tow sports motor, my
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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
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JUST BOUGHT A USED 2004 SEA RAY 260 SUNDANCER WITH THE MX 6.2
JUST BOUGHT A USED 2004 SEA RAY 260 SUNDANCER WITH THE MX 6.2 MPI HORIZON. HAD A CHECK ENGINE ON THE STARCRAFT MONITORING SYSTEM COME UP. OIL LEVELS GOOD AND THE ENGINE TEMP IN 150 DEGREES AND DOES NO… read more
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James
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today went on a cruise with my 400 sundancer. it has twin mercruiser
today went on a cruise with my 400 sundancer. it has twin mercruiser 7.4 mpi's. ran it up to about 3800 rpm, ran great. back it down to 1200 and was cruiseing and at some point the port oil pressure w… read more
Dominick
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i have an 04 5.0 mpi with 70 hrs low oil psi alarm
i have an 04 5.0 mpi with 70 hrs, last weekend i got a low oil pressure alarm then the gauge read 0psi I shut it down & chceked the oil it was fine when i restarted the gauge read somewhere around 50 … read more
Ted G.
Ted G.
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I have a MerCruiser 6.2 MPI engine, and we took it out yesterday,
I have a MerCruiser 6.2 MPI engine, and we took it out yesterday, and it started overheating almost imediately when we got into the water. I ran it on shore for about 5- 10 minutes due to a low batter… read more
Ted G.
Ted G.
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I have twin 05/06 mercruiser 8.1 HOs on a 40 ft Meridian.
I have twin 05/06 mercruiser 8.1 HOs on a 40 ft Meridian. A month ago I went out and the over speed alarm went off on the stbd engine just as I was leaving the marina. I had just started to partially … read more
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Jeremy R.
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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
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I have a mercruiser 5.0l 220hp. My oil pressure stays at 40
I have a mercruiser 5.0l 220hp. My oil pressure stays at 40 psi while running or before the oil heats up but when I have the engine idoling my oil pressure drops to 0 and my alarm goes off killing the… read more
gearheadII
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I have a mercriuser 350 mag mpi the guardian alarm was activated
I have a mercriuser 350 mag mpi the guardian alarm was activated after starting the engine I ran it for several minuets and every 60 secoonds 2 beeps sounded. I turned the engine off and when I restar… read more
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Meet the Experts:

Ted G.

Ted G.

Rigger, Diagnostician

2,678 satisfied customers

40 years boating, Safe boating instruct., Offshore Race promoter, Failure Analysis, Expert Witness

Dominick

Dominick

Marine Mechanic

1,009 satisfied customers

25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified

John White

John White

Marine Mechanic

306 satisfied customers

11 years experience working on outboards, inboards, sterndrives & pwcs

Jason

Jason

Marine Mechanic

23,066 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,409 satisfied customers

40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

Jeff G.

Jeff G.

Marine Mechanic

4,730 satisfied customers

42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance

Captain Dave

Captain Dave

Marine Mechanic

2,672 satisfied customers

USCG Licensed Captain, 20+ Years Boating, Fishing, Maintenance and Repair Experience

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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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