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Dec 30th, 2023
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 Boat runs fine at first then Loses power
#6648589
09/19/11 04:19 PM
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Joined: Apr 2009
Posts: 103
johnson
OP
Outdoorsman
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OP
Outdoorsman
Joined: Apr 2009
Posts: 103 |
91 Johnson with a 175hp boat starts fine and runs fine for about 15 mins or so then , start running bad . I changed all the plugs I did a compression ck they where all in the high 90s . It has new gas with seafoam , I no nothing about boat motors but it seem like when it get to a certain temp that's when it starts . So I looked and I had one of the 2 thermostat was stuck open , not sure if that would cause it to run bad or not
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Re: Boat runs fine at first then Loses power
[Re: johnson]
#6649255
09/19/11 07:33 PM
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Joined: Jan 2005
Posts: 7,487
redchevy
TFF Celebrity
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TFF Celebrity
Joined: Jan 2005
Posts: 7,487 |
Not sure, but I would suspect electrical maybe.
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Re: Boat runs fine at first then Loses power
[Re: redchevy]
#6649479
09/19/11 08:23 PM
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Joined: Dec 2006
Posts: 45,504
Mudshark
TFF Guru
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TFF Guru
Joined: Dec 2006
Posts: 45,504 |
Stator. When they are starting to fail they will show it when they warm up. That is my guess and that is what it is.
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Re: Boat runs fine at first then Loses power
[Re: Mudshark]
#6649956
09/19/11 09:52 PM
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Joined: Mar 2011
Posts: 940
goodman_fishing
Pro Angler
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Pro Angler
Joined: Mar 2011
Posts: 940 |
Ignition/coil or it's starving for fuel somehow.
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Re: Boat runs fine at first then Loses power
[Re: goodman_fishing]
#6652838
09/20/11 05:32 PM
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Joined: Apr 2004
Posts: 14,069
Stump jumper
TFF Guru
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TFF Guru
Joined: Apr 2004
Posts: 14,069 |
Stuck thermostats will make it run too cool. A motor that is over cooled will not run right. This is the reason that you have stats. Of course this summer I heard that people were having some problems keeping them cool enough with the high water temps.
2200 Bay Champ/200 Mercury Optimax
2017 Tundra TSS 4x4 Crewmax 5.7L
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Re: Boat runs fine at first then Loses power
[Re: Stump jumper]
#6654506
09/21/11 01:07 AM
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Joined: Nov 2005
Posts: 4,061
Mike Halfmann the boatmann
TFF Team Angler
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TFF Team Angler
Joined: Nov 2005
Posts: 4,061 |
Stator or thermostats....most likely stator.. Definately not fuel related. Because fuel problems start at the get go and not after running a while. These type of problems don't come and go. Stator will do what your describing. Runs great then goes to pot. Thermosts usually indicate an intermitten problem. Runs good, goes to pot, then runs good again. So back to stator. Good to start, grumpy as the day gets longer.....umph! Kind of like a couple of guys on this website.....LOL LOL
mike halfmann
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Re: Boat runs fine at first then Loses power
[Re: Mike Halfmann the boatmann]
#6657711
09/21/11 10:59 PM
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Joined: Mar 2011
Posts: 940
goodman_fishing
Pro Angler
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Pro Angler
Joined: Mar 2011
Posts: 940 |
Stator or thermostats....most likely stator.. Definately not fuel related. Because fuel problems start at the get go and not after running a while. These type of problems don't come and go. Stator will do what your describing. Runs great then goes to pot. Thermosts usually indicate an intermitten problem. Runs good, goes to pot, then runs good again. So back to stator. Good to start, grumpy as the day gets longer.....umph! Kind of like a couple of guys on this website.....LOL LOL I have had vehicles with fuel problems that would arise after several minutes of running. Debris would collect at the in-tank filter after the fuel pump has been pulling fuel, engine would stall/load up (suction would drop) and the debris would clear up for a few minutes. ..
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Re: Boat runs fine at first then Loses power
[Re: goodman_fishing]
#6657787
09/21/11 11:32 PM
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Joined: Nov 2008
Posts: 1,558
BassHunter 69
Extreme Angler
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Extreme Angler
Joined: Nov 2008
Posts: 1,558 |
Stator or thermostats....most likely stator.. Definately not fuel related. Because fuel problems start at the get go and not after running a while. These type of problems don't come and go. Stator will do what your describing. Runs great then goes to pot. Thermosts usually indicate an intermitten problem. Runs good, goes to pot, then runs good again. So back to stator. Good to start, grumpy as the day gets longer.....umph! Kind of like a couple of guys on this website.....LOL LOL I have had vehicles with fuel problems that would arise after several minutes of running. Debris would collect at the in-tank filter after the fuel pump has been pulling fuel, engine would stall/load up (suction would drop) and the debris would clear up for a few minutes. .. If the fuel line was getting clogged as your suggesting the primer bulb would be flat. So if thats not the case you can rule out fuel restriction.
Field Staff for Wicked Weights (Tungsten Done Right!)
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Re: Boat runs fine at first then Loses power
[Re: BassHunter 69]
#6657890
09/22/11 12:10 AM
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Joined: Sep 2011
Posts: 1,156
saltwaterjunky
Extreme Angler
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Extreme Angler
Joined: Sep 2011
Posts: 1,156 |
Don`t know what motor u have but my 115 johnson did that turned out to be a bad power pack,,,[sorry my bad u did say what motor u had]CRS got me again...Bill
Last edited by stuck in ftworth; 09/22/11 12:13 AM. Reason: didnt read enough
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Re: Boat runs fine at first then Loses power
[Re: saltwaterjunky]
#6664848
09/23/11 07:16 PM
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Joined: Jul 2008
Posts: 323
bwj
Angler
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Angler
Joined: Jul 2008
Posts: 323 |
I had a similar problem a couple of years ago and it turned out to be the coil.
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Re: Boat runs fine at first then Loses power
[Re: bwj]
#6664915
09/23/11 07:43 PM
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Joined: Feb 2007
Posts: 12,640
crappie-mark
TFF Guru
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TFF Guru
Joined: Feb 2007
Posts: 12,640 |
check for blown head gasket.
Last edited by crappie-mark; 09/23/11 07:43 PM.
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