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5.7 Mercruiser with electric fuel pump will start with
5.7 Mercruiser with electric fuel pump will start with throttle up in neutral, but dies when throttle is backed down to idle. I cleaned the fuel line recently. The pump is shaking a little and making … read more
Blake P
Blake P
Certified RV & Marine Technician
132 satisfied customers
Have 1996 mercruiser 7.4 carbureted engine that starts great
Have 1996 mercruiser 7.4 carbureted engine that starts great and runs good to about 2200 rpm. Struggles to get above this level. If I back down near idle I can get it to 3000 rpm before it quickly fal… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
I have a 2004 four wins horizon with a 5.7 liter 350 I
I have a 2004 four wins horizon with a 5.7 liter 350 I changed plugs cap rotor fuel filter and still won't run above idel with out stalling out any other ideas… read more
Jason
Jason
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Vocational, Technical or Trade School
20,534 satisfied customers
I have a 1988 Hurricane 19 ft. deck boat with a Mercruiser
Hi: I have a 1988 Hurricane 19 ft. deck boat with a Mercruiser Alpha 1 4.3 L engine. My problem is that the engine starts and runs fine up until about 3,400 to 3,700 rpm, but if I try to push beyond t… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
my 2005 mercury 75 hp 4 stroke run s and revs like a swiss
my 2005 mercury 75 hp 4 stroke run s and revs like a swiss clock in neutral but bogs in gear. will accelerate to 4900 rpm but at that number will bog and fall off - only way to keep it from dying is t… read more
Charles
Charles
Certified Mercury Tech
5,629 satisfied customers
my boat is giving off a popping noise. i changed the fuel/water
my boat is giving off a popping noise. i changed the fuel/water filter but its still doing the same. any ideas? 1999 searay mercruiser 5.7 L thunderbolt… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
Guys I have a problem with my df250 outboard. I cant get it
Guys I have a problem with my df250 outboard. I cant get it to rev above 3200 underway. If I try to push it up... it shudders and the revs totally die, once I back off the throttle it picks back up. A… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
1,805 satisfied customers
I have a 4.3 Mercruiser on a 20 ft boat and lately have been
I have a 4.3 Mercruiser on a 20 ft boat and lately have been experiencing engine hesitation problem after the engine warms up. It does not want to go above 3000 RPM. When engine co;d no problem gettin… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 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 1998 Bayliner boat with a 3.0 Mercruiser inboard/outboard
I have a 1998 Bayliner boat with a 3.0 Mercruiser inboard/outboard engine. It will start up and run at idle position. Then when I get it up to 1100 or more rpm's it will die. It will run for as long a… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
i change the spark plug roter and cap fuel/water filter and
i change the spark plug roter and cap fuel/water filter and it seem there is no gas when im putting it in gear and having a hard time starting the engine (mercruiser 5.7 liter 1988 alpha one with thun… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
hi my mercruiser mcm 5.0l with approx 90 hrs on it after 3
hi my mercruiser mcm 5.0l with approx 90 hrs on it after 3 month layup will not rev out i have changed the fuel filter and plugs but no improvment any surguestion shaun… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
2000 model 5.7L throttle body Chapparel. It starts and runs
2000 model 5.7L throttle body Chapparel. It starts and runs fine until I turn off for 10-15 minutes. It will try to re-start and then shut down. I have replaced fuel pump, filter, feeder hose, anti-sy… read more
gearheadII
gearheadII
Bachelor's Degree
138 satisfied customers
Hello i have a 1997 br210 searay with a 5.7 efi. it runs
Hello i have a 1997 br210 searay with a 5.7 efi. it runs great. but will not start after it is hot. it acts like a vapor lock not getting fuel. is this a common problem ? an is ther a fix? Customer… read more
gearheadII
gearheadII
Bachelor's Degree
138 satisfied customers
I have a 1984 johnson 150hp v-6, when i have it full throttle
I have a 1984 johnson 150hp v-6, when i have it full throttle it will not go fast at all. I stop put it in neutral rev it up then it will go. Once i slow back down i have to do it all over again. I al… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
i have a mercruiser 5.7 , just put new haed gaskets on it,
i have a mercruiser 5.7 , just put new haed gaskets on it, changed fuel filters set the timing, but i can not get the rpm,s out of , and cant get the boat on a plain. what can i do to improve this ???… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
i have a 5.7 liter merc engine fuel injected. when i hit the
i have a 5.7 liter merc engine fuel injected. when i hit the gas it cuts in and out. when i pulled the air cover and watched it while runnig it seems like one side of the carbureator is not shooting a… read more
Dominick
Dominick
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 satisfied customers
I own a 1986 searay sedan bridge with twin 350ci 5.7 L ...
I own a 1986 searay sedan bridge with twin 350ci 5.7 L engines. the problem I have is with my port engine. It runs great @ 3000 rpm for ten minutes then begins to stall . If I drop the rpm to neutral … 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

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

Dominick

Dominick

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

John White

John White

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

Jason

Jason

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20,534 satisfied customers

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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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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