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1998 mercruiser 7.4 MPI. Idles good, slow good, won't go
1998 mercruiser 7.4 MPI. Idles good, slow good, won't go fast. Compression is 90-120 in all cylinders. Plugs are fairly lean. One plug totally white. … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
I have a 1989 i/o when I put it in gear normally it chokes
I have a 1989 harris i/o when I put it in gear normally it chokes out and stalls if you slide it in gear real real slow just pass a certain point then you can hammer it… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
My 1989 mercruiser 2.5 l has a 3.0 l (tag 1389-9562). It
My 1989 mercruiser 2.5 l has a 3.0 l carburetor (tag 1389-9562). It starts with throttle only and runs at 2000 rpm. When you engage the drive train it dies. If you start in drive it may run, but only … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I have a mercruise 3.0 and it starts fine, but when I try to
I have a mercruise 3.0 and it starts fine, but when I try to increase speed it wants to stall out I can increase speed quickley and it will run fine, but when i slow down again it wants to stall again… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
1,739 satisfied customers
I have a mercruiser 230 hp v8 and i believe it is a 305 eng.
I have a mercruiser 230 hp v8 and i believe it is a 305 eng. When driving around 15 miles a hour the boat seems fine, but when I pick up speed it revs up the rpm's but the boat slows down and doesn't … read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
I have a 1988 stingray with a 3.0 mercruiser. The boat will
I have a 1988 stingray with a 3.0 mercruiser. The boat will run and idle fine forever. As soon as you throttle up and get going it loses power and shuts down. We have rebuilt the carburetor, new fuel … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
I have a 4.3 L Mercruiser engine that runs fine at speeds up
I have a 4.3 L Mercruiser engine that runs fine at speeds up to about 1500 rpm's, but when I get up to cruising speeds of 3000 rpm's and above, the boat will go for a short while then the engine slows… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I ask a question earlier in a previous E. But did not get an
I ask a question earlier in a previous E. But did not get an answer. Again, I am about to buy a 28' Aluminum hull cabin cruiser. it has a 3.0 L mercruise engine. Will this be sufficient power to make … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
I have a 4 cycle 4HP yamaha outboard. It starts fine, but
I have a 4 cycle 4HP yamaha outboard. It starts fine, but doesn't idle down at low speed well. At low speed, just above stall, it seems to be almost too fast to shift. It jumps into gear when shifting… read more
orcamarine
orcamarine
Proprietor
Vocational, Technical or Trade Scho
7 satisfied customers
I have a 21 ft. Bayliner Trophy without an engine. it is rigged
I have a 21 ft. Bayliner Trophy without an engine. it is rigged for a V8. I have the option to buy a 1989 Rinker deckboat that has a 5.0 L Mercruiser/outdrive. Would the engine/outdrive from the Rinke… read more
James
James
Marine Mechanic
Vocational, Technical or Trade Scho
4,111 satisfied customers
I have just had a volvo 130 h p diesel and a sx outdrive fitted.
I have just had a volvo 130 h p diesel and a sx outdrive fitted. The boat is a 27 foot 11 foot medium vee. I cruise the upper thames, speed limit is 6 knots. The problem is the boat wanders a lot and … read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
We own a 1989 Glastron with a mercruiser 4.2 l 175 hp. The
We own a 1989 Glastron with a mercruiser 4.2 l 175 hp. The engine was recently tuned up at a marina and serviced after spending 2 years in storage. Boat is in the water now. Engine will start and idle… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
I just bought a boat (1989 glastron 17 futura 4.3 merc).
I just bought a boat (1989 glastron 17' futura 4.3 merc). Wasn't able to test it prior to purchase. just took it to the lake and couldn't get it off the trailer. the engine would die when I put it in … read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
Have 4.3 LX mercruiser 1996 has New Rotor,plug wires,spark
Have 4.3 LX mercruiser 1996 has New Rotor,plug wires,spark plugs, Module, sending unit inside the distributor and cap , coil also. It has a thunderbolt ingisition. Cruises down the lake them misfires … read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
I just paid to have my 1998 mercruiser 5.7 L engine rebuilt,
I just paid to have my 1998 mercruiser 5.7 L engine rebuilt, they did a new short block and a carburator rebuild. We took the boat out this afternoon with the new short block and when you push the thr… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
i have a 3.0 liter mercruise motor on a 1983 marktwain open
i have a 3.0 liter mercruise motor on a 1983 marktwain open bow. i rebuilt the carb with the standard rebuild kit but it still wants to die when you first try to take off with the boat from idle speed… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have a Maxum 2100sr boat with a 5.0 mercruiser. The boat
I have a Maxum 2100sr boat with a 5.0 mercruiser. The boat oversteers at slow speed. When checking without motor running steering wheel has excess travel before plunger moves at back of engine. Is the… read more
Jason Forsberg
Jason Forsberg
Outboard Marine Mechanic
Vocational, Technical or Trade Scho
531 satisfied customers
I have a 1996 Mercruiser I/O 3.0 LX that wasnt used for the
I have a 1996 Mercruiser I/O 3.0 LX that wasn't used for the past 5 years. Took it in for a tune up to get it back in the water. The guy says he hears knocking and thinks the motor is shot and says 4-… read more
Joe
Joe
Owner Kingsland Auto & Marine Services
Vocational, Technical or Trade Scho
1,370 satisfied customers
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Meet the Experts:

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Dominick

Marine Mechanic

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Jason

Jason

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Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

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

Jeff G.

Jeff G.

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Captain Dave

Captain Dave

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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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