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False overheating light and buzzer going into limp mode at
False overheating light and buzzer going into limp mode at speeds above 3000 rpm . I replaced impeller last year and just replaced the thermostats. Water pressure is 7 lbs at idle and 20 at speed. I c… read more
CalebA820
CalebA820
Technician
Marine technology
22 satisfied customers
I asked you a question a couple weeks back about the
Hello Charles, I asked you a question a couple weeks back about the operating temps of my 2005 150xr6. You helped me narrow down that the exhaust tuner was loose and that was probably causing my eleva… read more
Charles
Charles
Certified Mercury Tech
5,752 satisfied customers
2005 Mercury 150 XR6. Have a question about operating
2005 Mercury 150 XR6. Have a question about operating temperature. Boat was new to me last year. Did not have a temp or water pressure gauge when I got it. I installed both this year so I could keep a… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I have a 2002 mercury 150L, 150hp v6 outboard. It just
I have a 2002 mercury 150L, 150hp v6 outboard. It just started overheating one day. the water squirts out the tell tale the same rate it always has. The engine heads get up to about 185. I have replac… read more
Charles
Charles
Certified Mercury Tech
5,752 satisfied customers
I have a 1999 Mercury 150 outboard (S/N 0G826880) Last
Hi Jason, I have a 1999 Mercury 150 outboard (S/N 0G826880) Last season the engine was running hot. I replaced water pump and it ran normal. This year before launching I replaced thermostats just beca… read more
Charles
Charles
Certified Mercury Tech
5,752 satisfied customers
Recently bought a rebuilt 1998 200hp Mercury EFI and I'm in
Recently bought a rebuilt 1998 200hp Mercury EFI and I'm in the process of doing a break-in on it. Into the third hour of operation and running it on plane at 3500-4000 rpms it runs great for 15 minut… read more
Charles
Charles
Certified Mercury Tech
5,752 satisfied customers
2005 mercruiser 5 L ser.ow382183 loss of top end power
2005 mercruiser 5 L ser.ow382183 loss of top end power .after warm up engine goes into limp mode with a continues alarm .fuel pump rail pressure is 40 psi at all rpm any ideas… read more
Charles
Charles
Certified Mercury Tech
5,752 satisfied customers
I have a 2004 200hp Mercury EFI. As soon as motor heats up
I have a 2004 200hp Mercury EFI. As soon as motor heats up or I need to pull tube I can't get out of the hole without alarm going off and motor powering down. Thermostats seem fine and I have hot wate… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
2,743 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
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
2001 merc 150 carb engine. S/n 0t395869 , engine is running
2001 merc 150 carb engine. S/n 0t395869 , engine is running warm at idle speed in gear temp around 160-180 and tell tail is weak,anything above idle speed all is good,temp is steady at 140-145 and goo… read more
Charles
Charles
Certified Mercury Tech
5,752 satisfied customers
My 1988 V150 has a figure-8 shaped poppet valve cover--one
My 1988 V150 has a figure-8 shaped poppet valve cover--one larger hole where the poppet valve is and a smaller hole,both in the engine block --the small hole has a plug and o-ring that was just laying… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 satisfied customers
I have a 99 Merc 150 XR6. I have a temp warning buzzer and
I have a '99 Merc 150 XR6. I have a temp warning buzzer and an in dash temp gauge. The gauge just reads cold to hot. Starting about two years ago, then temperature gauge would creep up when at a fast … read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
2,743 satisfied customers
jeff, here is the entire story. i have pr merc offshore 200. they
jeff, here is the entire story. i have pr merc offshore 200. they have always run "hot" in my opinion gauge says 140 at idle and 190 when running. i have installed new t stats, poppet, and water pump … read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 satisfied customers
Hi, I have a F30 ELPT Serial OR109554 and have had it for a
Hi, I have a F30 ELPT Serial OR109554 and have had it for a few years with no problems. Beginning of March I took it our and after idling through a long no wake zone, tried to speed up and the alarm w… read more
Jason
Jason
Associate Degree
210 satisfied customers
Merc 150, 2005 when idling, sometimes alarm sounds. Water pressure
Merc 150, 2005 when idling, sometimes alarm sounds. Water pressure was good, oil reservoir over half full, lid appears to be tight. I had to shut engine down for the alarm to go off. Let it set for ap… read more
Jason
Jason
Associate Degree
210 satisfied customers
my waring horn comws on at times when running high power settings,
my waring horn comws on at times when running high power settings, when reducing power it stopps, most of the time it will not come back on. this usuall occurs on the first run, i noemally idel the mo… read more
Jason
Jason
Associate Degree
210 satisfied customers
Hi, I have a 1988 2.3l ford tko with cobra 400 I/O. Ive had
Hi, I have a 1988 2.3l ford tko with cobra 400 I/O. I've had this boat since new. Overheating problem within minutes of cold start up, does not matter whether it is idling or powered up. Here is a lis… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
The temp gauge indicates my1979 Volvo Penta dual ...
The temp gauge indicates the 1979 Volvo Penta dual carburated engine is running warm/hot. But the engine does not seem overly hot to the touch. How can I determine if the engine needs work or if the e… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 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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