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The motor is a 90 HP 4 steoke EFI.There is an intermittent
The motor is a 90 HP 4 steoke EFI.There is an intermittent fault.The motor starts fine,put it in gear and bring up the revs...sometimes there is a 6 beep warning and the revs will not go past 2540.The… read more
Charles
Charles
Marine Mechanic
Certified Mercury Tech
5,014 satisfied customers
My motor was running good and now it started bogging and
My motor was running good and now it started bogging and won't go over 2000 rpm … read more
Charles
Charles
Marine Mechanic
Certified Mercury Tech
5,014 satisfied customers
2008 merc 225 0ptimax pro xs. Iam in guardian mode. idles
2008 merc 225 0ptimax pro xs. Iam in guardian mode. idles perfect but will not get over 1500 rpm.new ngk plugs.it ran perfect stopped and shut engine off and here we are. i ran the boat low on oil and… read more
Charles
Charles
Marine Mechanic
Certified Mercury Tech
5,014 satisfied customers
Related to my last question regarding how my ECM interprets
Hi Jason, related to my last question regarding how my ECM interprets the signal from the shift position sensor....you mentioned that the ECM will limit RPM to 3,000 when it thinks the boat is in neut… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
Ted, starting a new question for you given new information
Hi Ted, starting a new question for you given new information about my ongoing engine problem. I did not end up swapping out the throttle position sensor as a local mechanic confirmed you're thinking … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
We have a 2005 Sea Ray Sundancer with twin 4.3 mercruisers.
We have a 2005 Sea Ray Sundancer with twin 4.3 mercruisers. Both motors fire up, but one will not go out of guardian mode. We have spent thousands of dollars at 4 different marine repair shops with no… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
Engine gives an alarm and goes into guardian mode after
Engine gives an alarm and goes into guardian mode after about 10 minutes of running. Have verified that the manifold is only 120 degrees or so. Does not appear to be an overheat issue. Have replaced b… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
Fix my boat please. Boat appears to be in the safe mode.
Fix my boat please. Boat appears to be in the safe mode. Will not rev up beyond 3K. It has a 5.8 FSI (Ford 351W) Does this boat have a port for a code scanner.… read more
Expert-Repair
Expert-Repair
Owner Kingsland Auto & Marine Services
Vocational, Technical or Trade Scho
11 satisfied customers
I am trying to understand the wiring system Mercruiser trim
I am trying to understand the wiring system for a Mercruiser trim limit switch. I installed a MCM 350 Mag MPI engine in my boat that has a Volvo SX outdrive. Everything works fine, except the computer… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
I have a 2008 Mercury 250 Pro Xs. I have been having issues
I have a 2008 Mercury 250 Pro Xs. I have been having issues with motor losing power, cutting in and out like a coil is going bad. Some times it runs great hits top end with no problem and hits hums al… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
solid alarm on 2004 mercruiser 5.0 MPI only in gear. Will idle
solid alarm on 2004 mercruiser 5.0 MPI only in gear. Will idle and take fuel out of gear but put in gear and try to give it throttle and solid alarm and puts in guardian mode. shut off start right bac… read more
Noel
Noel
Marine mechanic
Diploma
44 satisfied customers
2003 Mercury 115 HP EFI Four-stroke, Saltwater, serial number
2003 Mercury 115 HP EFI Four-stroke, Saltwater, serial number # XXXXX Ran fine until I pulled another boat, now it will not run above 4000 rpm under load (in gear). Seems guardian mode kicked in and i… read more
Charles
Charles
Marine Mechanic
Certified Mercury Tech
5,014 satisfied customers
I have a 2012 mercury 115 forur stroke on a pontoon it accedently
I have a 2012 mercury 115 forur stroke on a pontoon it accedently over revved in a turn when it lost water It went to 7200 RPM and the warning sounds went off. Question is it ok not the alrms went off… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
Hi i have a 60 hp merc efi it seams like fuel starvation when
Hi i have a 60 hp merc efi it seams like fuel starvation when i go past 2400 revs at sea but when on land running in neutral in it a tank holds 4500 revs ok any idears… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
I have a 4.3L MPI engine that is showing seawater pressure
I have a 4.3L MPI engine that is showing seawater pressure of around 2.5psi. When the engine reaches 3500rpm the engine guardian engages and I get an overspeed fault. The engine is not actually over-r… read more
Jeremy R
Jeremy R
1,069 satisfied customers
I HAVE A MERCURY 150L SALTWATER EFI WITH 120HRS...IN JULY I
I HAVE A MERCURY 150L SALTWATER EFI WITH 120HRS...IN JULY I HAD A NEW INPELLER, PLUGS,FUEL WATER SEP ETC REPLACED...MY MECHANIC SAID THE BOAT WAS GOOD..WENT TO THE COAST AND HAD ALARMS GOING OFF LIKE … read more
Jack
Jack
Marine Technician
Vocational, Technical or Trade Scho
54 satisfied customers
Hello- I am investigating a recall on the exhaust systems of
Hello- I am investigating a recall on the exhaust systems of my 525 EFI merc racing engines..question is- following the replacement of the exhasts was there a rev limiting mechanism installed to restr… read more
mercmastertech
mercmastertech
Service Manager, Master technician
Technical School
249 satisfied customers
I have 2004 mercury 225 optimax that the motor started shutting
I have 2004 mercury 225 optimax that the motor started shutting down when I hit 6000 rpms. But I can run at 5500 or 5800 and it won't die at all.… read more
Mechman45
Mechman45
Vocational, Technical or Trade School
152 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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