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5.7 gsi pefs runs great wot but runs rough as if it was
5.7 gsi pefs runs great wot but runs rough as if it was missing in idle . What would be the number one culprit , I change map sensor new cap and rotor cleaned injectors new fuel pump what else .… read more
Jason
Jason
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My 2001 yamaha 115 2 stroke was running great at the end of
my 2001 yamaha 115 2 stroke was running great at the end of last season, started up this spring ang ran great at idle. started out onto lake and upon giving gas rpm's increased and then motor started … read more
Jason
Jason
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Briggs, I have a 2000 Volvo 5.7 GSi (grey) with throttle
Hi Briggs, I have a 2000 Volvo 5.7 GSi (grey) with throttle body and carter fuel pump pack. It did not start or run and the fuel pump would not prime or run. I replaced it with an entire new fuel pump… read more
Jason
Jason
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My boat has a 1990 volvo 5.7 liter v-8 engine that is running
My boat has a 1990 volvo 5.7 liter v-8 engine that is running very rough. Its hard to start and idles erratically. When I try to accelerate it struggles to get on plane because it lacks power. when cr… read more
Tan
Tan
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i have a 1989 mercruiser 5.7. it spits n sputters as u increase
i have a 1989 mercruiser 5.7. it spits n sputters as u increase rpm. engine was rebuilt last year. i put new coil, and carb on it and ran good first day out but slowly got worse now even kinda idling … read more
Tan
Tan
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Boat starting problem I have a 1999 Bayliner Trophy with
Boat starting problem I have a 1999 Bayliner Trophy with a 4.3 mercruiser engine serial # XXXXX It has a 2 bll carb and a Thunderbolt ignition. I bought it last fall and I was told it had been in stor… read more
Tan
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I have a 2000 boat with a Mercruiser 5.7 inboard motor
I have a 2000 boat with a Mercruiser 5.7 inboard motor (engine number L393678). It runs great for 15 minutes, and then dies. After that, I can run the motor in neutral, but it stalls in gear. If I con… read more
James
James
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Vocational, Technical or Trade Scho
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I have a 1989 5.7 liter mercruiser. It will not hold rpm over
I have a 1989 5.7 liter mercruiser. It will not hold rpm over 3200 rpm. If I bring the boat up to 4000rpm it will come up on plane for only a minute or two then the rpm will drop off and almost stall … read more
Tan
Tan
MerCruiser Certified Technician
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Tan I just put my bayliner in the water ran great but when
Tan I just put my bayliner in the water ran great but when I went to put it to idle stalls and now hard to start. But when I can get it into gear quick and power up it runs fine. But as I back off it … read more
Tan
Tan
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my boat almost sank during a hurricane last fall, when high
my boat almost sank during a hurricane last fall, when high water forced it off the lift. Initailly it ran fine, but then started running rough and stalling out. I had mechanic look at it and he confi… read more
Tan
Tan
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I have a 1999 5.7 Volvo GSi with throttle body fuel injectors.
I have a 1999 5.7 Volvo GSi with throttle body fuel injectors. At the end of a great day boating, the engine started stalling out just before punch-over and fails to get on plane after a very normal s… read more
Jason
Jason
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I have a 2002 5.7 liter, I put the boat in the water and headed
I have a 2002 5.7 liter, I put the boat in the water and headed down the intercoastal ,it would not stay runing except at idol, any throttle and it would sputter and die. I changed the fuel filter, no… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
Hello, I have a problem that has been tormenting me for three
Hello, I have a problem that has been tormenting me for three weeks now. The boat runs fine at wide open throttle. When at idle It does run good when cold for about 1 minute after that it loads up, ga… read more
Joe
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My Vovo Penta 8.1 GSI Runs great from cold start. Will run
My Vovo Penta 8.1 GSI Runs great from cold start. Will run great for 10 to 15 min, then starts to run rough and dies. Has plenty of gas. One of the schrader valves on the bottom of the center fuel cel… read more
Jeremy R.
Jeremy R.
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Hi , I have a oil injcted 65 hp suzuki about a 1995 . The engine
Hi , I have a oil injcted 65 hp suzuki about a 1995 . The engine would idle just fine but when i went to accelerate it would die . i took it to the shop . They stated the carbs needed rebuild so 600.0… read more
Captain Dave
Captain Dave
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I have a 1995 Sea Ray 30 with twin 350s, 5.7L. mercruisers
I have a 1995 Sea Ray 30 with twin 350's, 5.7L. mercruisers that once they come up to temp and when they stall they are very hard to start. Its like they are not getting fuel, I've tried just turning … read more
Master Tech
Master Tech
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I have a Mercruiser 5.7 efi -01 bravo 3 , it idles great for
I have a Mercruiser 5.7 efi -01 bravo 3 , it idles great for ca 10 min then stalls , start again with no problem, stalls after 15 sec., 3 min, 15 min !!!! any idea? Also almost stalls when shifting, t… read more
ROCKET
ROCKET
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I have a 140hp Mercruiser, I think its 1975 to 1985. So we ...
I have a 140hp Mercruiser, I think its 1975 to 1985. So we were out on the boat it was pulling a skier fine and when we stopped it idled for a min or two until the person got back on the boat and when… read more
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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