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2008 Merc 6.2 MX MPI Starboard Engine is reaching 4000 rpm
2008 Merc 6.2 MX MPI Starboard Engine is reaching 4000 rpm WOT, Port Engine is reaching 4500 WOT (close to spec). Props tuned, filters clean. Fuel Pressure at rail Schrader valve is 40psi at idle for … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
18,744 satisfied customers
I have a 2006 searay with 6.2 mpi The port motor only comes
I have a 2006 searay with 6.2 mpi The port motor only comes up to 4500 rpm Throttle feels dead compared to starboard which revs to 5000 rpm and is Much stronger. Just had a valve job and head gasket r… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
1,766 satisfied customers
1999 Merc 454 Horizion wont turn over 3200 RPM under load
I have a 1999 37' Searay Sundancer with twin Merc 454 Horizion MPI that I have been struggling with the SB engine not turning up RPMs over 3200 WOT under load. Between 70% Throttle & WOT, port engine … read more
Expert
Expert
On our way home I found my 2000 Mercruiser MPI Horizon inboard
On our way home I found my 2000 Mercruiser MPI Horizon inboard engine would not excelerate beyond 2800 rpm. Oil pressure and temp are good. Starboard engine runs fine.… read more
Joe
Joe
Owner Kingsland Auto & Marine Services
Vocational, Technical or Trade Scho
1,382 satisfied customers
Both 496 mags will not stay running. Schared valve had little
Both 496 mags will not stay running. Schared valve had little air. Boat ran fine when docked. Yesterday starboard out lube bottle empty(strange). Alarm going beep-beep.filled bottle with lube. connect… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
I have twin mercruiser engines in my 32 boat. At idle and
I have twin mercruiser engines in my 32' boat. At idle and low rpms the engines run smoothly and seem fine. As the rpms increase to 3000 and above the starboard engine lags behind and won't make 4000 … read more
Ted G.
Ted G.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
704 satisfied customers
Hi There, I have a 2001 34 SD SeaRay with twin 6.2 MPIs.
Hi There, I have a 2001 34' SD SeaRay with twin 6.2 MPI's. My port engine has been giving me trouble since I bought the boat a few years ago. At first the engine ran fine at all times except after I h… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
18,744 satisfied customers
hello i have a mercruiser 6.2 mpi. it had a engine replaced
hello i have a mercruiser 6.2 mpi. it had a engine replaced and now it will not pass 4300 rpm, just hits a wall. i have read several places that ignition timing is a critical piece- i took it to a ser… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
18,744 satisfied customers
have a 2002 200 br searay with 5.0l mpi motor. have changed
have a 2002 200 br searay with 5.0l mpi motor. have changed pluugs, wires, cap,rotor, water/fuel filter, also pumped out all fuel, has fresh fuel. will start and idle perfect, no noticeable " burps", … read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
have 350 mag mpi horizon inboard 5.7. Engine will not start
have 350 mag mpi horizon inboard 5.7. Engine will not start but turns over.Spark and fuel ok.Fuel pump (part of fuel cooler assy) sounds likes its on when priming the ejector fuel rail during initial … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I have a 2002 320 Searay Sundancer with twin 6.2 Liter MPI
I have a 2002 320 Searay Sundancer with twin 6.2 Liter MPI V-drives with 770 hours. Left motor starts and runs fine but is dumping a lot of fuel out the exhaust which is also very aerated (Freshwater … read more
Dominick
Dominick
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 satisfied customers
I have a 2003 Mercruiser Mag 350 serial OM587340. Engine idles
I have a 2003 Mercruiser Mag 350 serial OM587340. Engine idles fine and runs well at 3000-3500 rpm for 5-10 min. Engine then bogs/hiccups and will not maintain rpms. Changed fuel/water separator and f… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
1999 mercruiser 350 MAG TPI, I am getting 32 psi fuel pressure.
1999 mercruiser 350 MAG TPI, I am getting 32 psi fuel pressure. New water seperator/fuel filter, cranks but won't run. What is the minimum fuel pressure? And can I get codes out of it with out a scann… read more
Dominick
Dominick
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 satisfied customers
I have a remanufactured (2006 ) by Mercruiser 6.2 liter 320
I have a remanufactured (2006?) by Mercruiser 6.2 liter 320 h.p. engine that I put in my tournament ski boat. It runs great in the straight away but when I turn (I run on oval courses most ofthe time)… read more
Joe
Joe
Owner Kingsland Auto & Marine Services
Vocational, Technical or Trade Scho
1,382 satisfied customers
I have a Mercruiser 6.2 mpi, 2002 year model. When running
I have a Mercruiser 6.2 mpi, 2002 year model. When running at slow speeds - 10 mph and under, and when in neutral, I get a fluctuation in rpm's. Like it is lacking fuel or air. But when running at hig… read more
Pappy's Sales and Service
Pappy's Sales and Service
Vocational, Technical or Trade Scho
586 satisfied customers
Have a 2002 Cruisers Yachts 3275 with twin Mercruiser 5.0L
Have a 2002 Cruisers Yachts 3275 with twin Mercruiser 5.0L MPI Alpha's. The port engine will stall when it has a load on it over 2400 RPM's. It sends no engine trouble light ot tone and shows no fault… read more
capt ron 1959
capt ron 1959
Owner/Marine Mechanic
Vocational, Technical or Trade Scho
348 satisfied customers
I have a 1997 33 searay. twin 454 mpi 340 hp. The starboard
I have a 1997 33 searay. twin 454 mpi 340 hp. The starboard tops out at 3200 rpms and with the computer from merc crusier shows the throttlebody is fully open. The port has all kinds of power to spare… read more
Mechman45
Mechman45
Vocational, Technical or Trade School
152 satisfied customers
I have a 2002 SeaRay 270 Sundeck with a 6.2 mercruiser FI engine
I have a 2002 SeaRay 270 Sundeck with a 6.2 mercruiser FI engine and Bravo3 drive. The motor starts and runs fine until 3,000 rpm. It will start surging and backfire and then die. It has about 220 hou… read more
Larry B.
Larry B.
Marine Service Tech
High School or GED
574 satisfied customers
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Meet the Experts:

Dominick

Dominick

Marine Mechanic

1,009 satisfied customers

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

Ted G.

Ted G.

Rigger, Diagnostician

704 satisfied customers

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

John White

John White

Marine Mechanic

306 satisfied customers

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

Jason

Jason

Marine Mechanic

18,744 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,264 satisfied customers

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

Jeff G.

Jeff G.

Marine Mechanic

4,729 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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