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My smartcraft system is showing a check engine symbol and
My smartcraft system is showing a check engine symbol and bell symbol at 4000 rpm … read more
Ted G.
Ted G.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
2,678 satisfied customers
4 beeps. Hold on, still typing. 1998 optimax. 4 beeps.
1998 optimax. 4 beeps. replaced oil resevoir. works. bypassed by jumper anyway. as for the fuel. drained the gas tank, added new fuel. cleaned out the fuel filter. opened the vapor separator drained out all the fuel. still same symptom. one other symptom. when running at 1800 rpm, (more than idle obviously) , it smokes. not sure if it is related problem.… read more
Charles
Charles
Certified Mercury Tech
5,752 satisfied customers
I received a constant beep from the warning buzzer on my 250
I received a constant beep from the warning buzzer on my 250 Pro XS. Oil levels and water pressure appear spot on. I did have cranking battery issues and had to move connections to my trolling motor b… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I was coming in the other day and the 150 optimax gave me
I was coming in the other day and the 150 optimax gave me 4 alarm beeps. Looked it up the manual and 4 alarm beeps every 2 minutes means : 1) Fuel filter has water in it. 2) Oil cap has a crack in oil… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 satisfied customers
I have a 2002 150 efi mercury smart craft. the last two weekends
I have a 2002 150 efi mercury smart craft. the last two weekends I have been having trouble with my alarm going off. It's a steady beep as soon as you turn the key . The first weekend it would quit af… read more
Charles
Charles
Certified Mercury Tech
5,752 satisfied customers
Mercury 135 optimax idles fine but if I try and go fast the
Mercury 135 optimax idles fine but if I try and go fast the continuous alarm will sound and the engine looses all power even at full throttle. Good stream of water coming out of the engine suggesting … read more
marinedoc
marinedoc
Lead Technician
Vocational, Technical or Trade Scho
73 satisfied customers
2001 Mercury 150 Optimax port engine overheats at low RPM,
2001 Mercury 150 Optimax port engine overheats at low RPM, ok at higher RPM. Replaced water pump and thermostate. Ran fine for about 20 hours. Now warning horn goes off after about 30 minutes at low s… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
2 yrs ago bought used boston whaler 255 conquest with twin
2 yrs ago bought used boston whaler 255 conquest with twin merc 150 optimaxs - coast guard was 1st owner-dodge dealer in mobile bay was 2nd-800+ hrs-motors run great-heats at idle and below 5 lbs of w… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have a 50HP EfI 4 stroke ELpt big foot engine on my pontoon
I have a 50HP EfI 4 stroke ELpt big foot engine on my pontoon that is a 2002 model year. It starts great and idles well but after a few minutes of running at speeds of 3000 rpm or more, a warning tone… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have an Optimax 2007 150HP. It has a continuous beep when
I have an Optimax 2007 150HP. It has a continuous beep when going about 1500-2000 RPM's. It slows down, but if I speed up between 3000-4000 RPM's it goes away. There is oil in the tanks, I cleaned the… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 satisfied customers
Hello, How are you I have an older Mako 17 w a Merc 150 Outboard.
Hello, How are you? I have an older Mako 17' w a Merc 150 Outboard. I live in the Mountains of NC. At the beginning of the winter we had an early frost. I didn't winterize the motor at that point. The… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 satisfied customers
I have a 2006 sun tracker party barge with a 90 hp optimax.
I have a 2006 sun tracker party barge with a 90 hp optimax. today when I put it in the water and ran it for about 15 minutes or so there was a lound peirceing alarm that came on and off again in the c… read more
Jason
Jason
Associate Degree
210 satisfied customers
After realizing too late what that alarm meant when i turned
After realizing too late what that alarm meant when i turned the ignition on, it meant low oil, I continued to run my twin Mercury 150 optimax engines for several hours. Do they cut off when the oil i… read more
Scott
Scott
Marine technician
Vocational, Technical or Trade Scho
543 satisfied customers
merc optimax 150 year 2000. The problem is I have no power
merc optimax 150 year 2000. The problem is I have no power when the alarm is on. I don't know if the alarm is for oil or overheating. Checked water coming out of motor is okay-no overheating. The moto… read more
ROCKET
ROCKET
MASTER CERTIFIED TECH
Vocational, Technical or Trade Scho
426 satisfied customers
I have a 2001 mercury 40 hp 4 stroke EFI outboard motor. only
I have a 2001 mercury 40 hp 4 stroke EFI outboard motor. only problem is that when returning to slower speed or idle speed after runing up to about 4500 rpm ....when returning to slower speed I get a … read more
joshua.mathis
joshua.mathis
High School or GED
14 satisfied customers
I have a 2006 150 Merc Optimax. My oil reservior attached to
I have a 2006 150 Merc Optimax. My oil reservior attached to the motor leaks oil whenever I run the motor over idle. I was thinking of siliconing the cap to keep it from leaking until I can get it to … read more
The jet ski mechanic
The jet ski mechanic
Vocational, Technical or Trade Scho
18 satisfied customers
I have a 5.7 300hp and it taking in water at approx 3000 rpm
I have a 5.7 300hp and it taking in water at approx 3000 rpm and above. replaced motor last yr and had the same problem with old motor. new motor is reconditioned, also after finding out new motor was… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
I have a 2004 Mercury Optimax 135 HP Very low hrs. Why am I
I have a 2004 Mercury Optimax 135 HP Very low hrs. Why am I having trouble keeping water pumps in this engine. Dealer says it's normal for this model ?… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
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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

22,043 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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