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1987 Mercruiser 5.0LX, been running great but when on the
1987 Mercruiser 5.0LX, been running great but when on the water yesterday engine died when idling down at the ramp. Cranked, but would boat fire up. Got it on the trailer, inspected for loose wires, e… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
18,952 satisfied customers
I have a nagging problem that has been in place since I
I have a nagging problem that has been in place since I bought this boat in 2010. I am the third owner. The problem is, the Mercruiser I/O V8 idles roughly, stumbles, then dies when in gear after it i… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
18,952 satisfied customers
Loss of rpm at cruise speed. Twin 4.3lx .Synchronizer
loss of rpm at cruise speed . Twin 4.3lx .Synchronizer fluctuates about 50rpm.noticeable difference in throttle position. seems to run ok. Plugs, wires ,cap and rotor replaced 3 yrs ago … read more
Jason
Jason
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Vocational, Technical or Trade Scho
18,952 satisfied customers
Boat motor got wet (drain plug). 1999 Mercruiser 5L ran
boat motor got wet (drain plug). 1999 Mercruiser 5L ran bilge. boat turns over and over but won't fire. pulled plugs and distributor cap, then turned over to make sure no water in cylinders. tested an… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
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I'm ***** ***** I have a Mercuiser EFI 500 system I am adapting
I'm ***** ***** I have a Mercuiser EFI 500 system I am adapting to a truck with a big block Chevy. I see the PCV valve in the intake lower half that connects with a hose to 90 deg fitting on the drive… read more
Jason
Jason
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Vocational, Technical or Trade Scho
18,952 satisfied customers
2005 Mercruiser 5.0 MPI. The boat sat a year and the
2005 Mercruiser 5.0 MPI. The boat sat for over a year and the gas was not drained. We drained most of the gas, added new gas, stabilizer and made sure the battery was fully charged. It turns over and … read more
Tan
Tan
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Good morning, I have a 1980 Mercruiser 228 that runs fine
Good morning, I have a 1980 Mercruiser 228 that runs fine when the weather is warm and dry, but when the weather turns cool and damp, it will start and run for a while, but if I shift into neutral and… read more
Jason
Jason
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Vocational, Technical or Trade Scho
18,952 satisfied customers
I have a 2002 Mercruiser 5.0 MPI here in NY that I just put
I have a 2002 Mercruiser 5.0 MPI here in NY that I just put back in the water for this new season yesterday. It started up fine and ran perfectly smooth for about 20 mins when all of a sudden it just … read more
Jason
Jason
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Vocational, Technical or Trade Scho
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GOT WATER IN CRANKCASE AGAIN ALREADY REPLACED UPPER AND LOWER
GOT WATER IN CRANKCASE AGAIN ALREADY REPLACED UPPER AND LOWER ADAPTER PLATE GASKETS NOW GETTING WATER IN BREATHER HOSE AND AIR CLEANERXXXXXEFI 1700 CC… read more
Charles
Charles
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Hello, I have a 1998 Chaparral 19.6 with a 350 mercruiser.
Hello, I have a 1998 Chaparral 19'.6 with a 350 mercruiser. It has started backfiring or sputering after it wams up. The spark plugs, plug wires, ignition module, cap and rotor, fuel filter, coil, hav… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I own a 2005 yamaha fx110 waverunner. Mistakenly, I added
I own a 2005 yamaha fx110 waverunner. Mistakenly, I added an extra quart of oil in the beginning of the season. I ran it that day and noticed black smoke/stains on the back of the machine near the pum… read more
John White
John White
Marine Mechanic
Vocational, Technical or Trade Scho
306 satisfied customers
Got a 1996 230 sea ray with 5.7 mercruiser is that 260hp Doesnt
Got a 1996 230 sea ray with 5.7 mercruiser is that 260hp? Doesnt seem to be if so , and I got a little oil coming up the pcv line to air filter, any ideas. thanks… read more
Master Tech
Master Tech
Service Manager/Technician
Vocational, Technical or Trade Scho
1,167 satisfied customers
SeaRay Sundancer 270 7.4 mercruiser has fuel, cranks but will
SeaRay Sundancer 270 7.4 mercruiser has fuel, cranks but will not start. engine ran great all day...35 miles perhour for one hour. I powered down through a 5 mph zone...upon acceleration the engine di… read more
Dominick
Dominick
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Vocational, Technical or Trade Scho
1,009 satisfied customers
I have a 2000 1950 Bayliner Capri runabout with a 135 HP Mercruiser
I have a 2000 1950 Bayliner Capri runabout with a 135 HP Mercruiser I/O. It has started making a clicking noise that seems to be on the starboard side of the engine after running for about 5 minutes a… read more
Master Tech
Master Tech
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Vocational, Technical or Trade Scho
1,167 satisfied customers
I have a 2007 Mercruiser 4.3. Had trouble starting it and it
I have a 2007 Mercruiser 4.3. Had trouble starting it and it flooded completely after trying for one hour to start it. Changed the plugs and tried again wouldn't start. The next day I added fuel stabi… read more
briggs archer
briggs archer
master marine mechanic
Associate Degree
374 satisfied customers
I have a 2005 Mercruiser 5.7l 350 MAG MPI SN ow343552. The
I have a 2005 Mercruiser 5.7l 350 MAG MPI SN ow343552. The engine decal calls for AC plug 41-932, some literature calls for AC 41-993. Why the difference? What would be the best plug, should I use som… read more
mercmastertech
mercmastertech
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i have a 1992 wellcraft 196 eclipse with a 4.3LX mercruiser.
i have a 1992 wellcraft 196 eclipse with a 4.3LX mercruiser. it is hard to explain the problem, but i will try. i had it out on the lake today about half throttle and i went to full throttle and a few… read more
ROCKET
ROCKET
MASTER CERTIFIED TECH
Vocational, Technical or Trade Scho
426 satisfied customers
I have a 4.3L Mercruiser engine with a sterndrive. Recently
I have a 4.3L Mercruiser engine with a sterndrive. Recently I was winterizing my boat like I've done for the past several years. I had the flushing attachment over the water pickup and was running the… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
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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

747 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

18,952 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,399 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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