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We have two merc 7.4l in our Sea Ray. Do you know if they
Hello we have two merc 7.4l in our Sea Ray. Do you know if they have a Guardian mode? … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I have a 2006 Mercruiser 496 350 hp 5.0 L engine... it has
I have a 2006 Mercruiser 496 350 hp 5.0 L engine... it has recently had a tendency for the temp to slowly creep up above 160 temp to close to 175...especially when I slow down from cruising at 2000 RPM plus. Also, my water psi reads about 8.9 psi in idle and around 37 psi at 3000 rpm. … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
My 1985 sea ray 340 sedan bridge mercruiser 454 7.4
my 1985 sea ray 340 sedan bridge mercruiser 454 7.4 starboard engine wont go over 2000 rpm's under load, but in nuetral it will go to 4000 rpms … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I have a 2000 Mecury Optimax EFI Saltwater 150HP motor that
I have a 2000 Mecury Optimax EFI Saltwater 150HP motor that randomly will rev up to 2000-2500 rpms while sitting at idle then back down to it's normal range. This can happen a few times in a minute th… read more
Charles
Charles
Certified Mercury Tech
5,752 satisfied customers
You have helped me in the past so I thought I would come
Hi Jason, you have helped me in the past so I thought I would come back and seek more advice from you. I launched my Rinker 342 on Friday and a problem that was happening at the end of last season of … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
We have a 2007 Sea Ray 320 with 6.2L 377hp mercury MPX
We have a 2007 Sea Ray 320 with 6.2L 377hp mercury MPX inboards. We noticed that the starboard engine was sluggish to turn over and ran rough when it did. We had local mechanic look at it and noticed … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
Is 110 to 120 psi on a 2002 V6 Mercruiser with 590 hrs acceptable or not? Tired of politic
Is 110 to 120 psi on a 2002 V6 Mercruiser with 590 hrs acceptable or not? Tired of political answers. It is in a Four Winns 180 that is sound except for sunbeaten upholstery. This boat needs to do 25 … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,507 satisfied customers
My boat Is a 2006 crowneline with a 350 mpi. I have had the
My boat Is a 2006 crowneline with a 350 mpi. I have had the boat worked on by two different mechanics. The boat gets a solid alarm at 4100 rpms and the computer reduces power. The boat is having low w… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
Hi Tan,Long time without news. Lets talk about my 1996 searay
Hi Tan, Long time without news. Let's talk about my 1996 searay 33 ft with 2 eng. mercruisers 7.4 l. The red light marked "Transmissions" of my port engine is on. I checked transmission oil wich is cl… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,507 satisfied customers
I currently have a 2000 sea ray 410 sundancer with 7.4 mercruiser
I currently have a 2000 sea ray 410 sundancer with 7.4 mercruiser horizons with 700hrs. A recent compression test showed cylinder #5 on the port engine @ 80 PSI while all others were in the 130-140 ra… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,507 satisfied customers
2000 Sea Ray 260 cruiser with a Mercruiser 7.4 mpi. When under
2000 Sea Ray 260 cruiser with a Mercruiser 7.4 mpi. When under load engine rpm hits 2600 and hangs there until the boat is about to plane then it as if something switches and rpm gains as normal. The … read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
I have twin 7.4L 454Mag MPIs (year 2000) with 500 hours.
I have twin 7.4L 454Mag MPI's (year 2000) with 500 hours. New boat owner (2 months). Port engine has been prdoucing a bluish-gray smoke through the exhaust - much more so than the starboard engine. Ye… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,507 satisfied customers
One of my engines is overheating at a slow rate. The raw water
One of my engines is overheating at a slow rate. The raw water cooled engine temperature normally sits at 175 degrees, but has been increasing slowing (over past 8 months) to 200 degrees at present. R… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I recently bought a 1997 29ft Sea Ray with twin 4.3L engines.
I recently bought a 1997 29ft Sea Ray with twin 4.3L engines. One of the power steering pump hoses has been disconnected from the power assist unit and I can not figure where both sets of hoses attach… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
2,715 satisfied customers
I have 8v92TA s in my boat. They were just overhauled and now
I have 8v92TA s in my boat. They were just overhauled and now the maximum rpms are 200 less than they should be. Could it be an injector problem even though the mechanic tells me they are all working?… read more
Diesel Boat Doc
Diesel Boat Doc
High School or GED
120 satisfied customers
I HAVE A 1998 37 SEARAY WITH TWIN 7.4L MULTIPORT FUEL INJECTED
I HAVE A 1998 37' SEARAY WITH TWIN 7.4L MULTIPORT FUEL INJECTED ENGINES.I'VE HAD THE BOAT A LITTLE OVER A YEAR AND THE ENGINES HAVE BEEN RUNNING GREAT. THE VOLT METERS HAVE ALWAYS READ A LITTLE HIGH W… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,507 satisfied customers
i have a 1989 340DA sea ray with twin 7.4 carb. while out
i have a 1989 340DA sea ray with twin 7.4 carb. while out on the boat last night.. about 40 mins into the cruise heard a "bump" behind myself (starboard engine) sounded like someone closing a cabinet.… read more
capt ron 1959
capt ron 1959
Owner/Marine Mechanic
Vocational, Technical or Trade Scho
348 satisfied customers
My starboard engine (Yamaha Jet Boat) will only last a few
My starboard engine (Yamaha Jet Boat) will only last a few seconds at 5k rpm then shuts down or goes down to 3k rpm or below. I understand that it must be overheating. I think that water is flowing th… read more
Joe
Joe
Owner Kingsland Auto & Marine Services
Vocational, Technical or Trade Scho
1,396 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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