2000 Ski Nautique Throttle Issues
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=42898
Printed Date: November-15-2024 at 6:26pm
Topic: 2000 Ski Nautique Throttle Issues
Posted By: DefectiveDave
Subject: 2000 Ski Nautique Throttle Issues
Date Posted: June-06-2018 at 2:54pm
I have a 2000 SN with the GT-40 engine. Today I had an issue with throttle/engine that I'm trying to narrow down before I start replacing parts. The boat ran well with no issues for 3 sets of slalom and then on the 4th set starting misbehaving. These are the symptoms.
1) Very slow hole shot and then getting up to course speed. It was taking the boat 5-10 seconds to drag me out of the water and then another 10 seconds to get to course speed. We tried disengaging perfect pass and controlling the throttle by hand to make sure that perfect pass wasn't the issue and the problem remained.
2) Significant hesitation of the engine when traveling at course speed. It would suddenly lose and then regain throttle within a second, sometimes several times within a second. The problem seemed to be worse at 36 MPH vs 34.2 MPH. The speed didn't change much and the hesitant wasn't major, but it was noticeable. We disengaged perfect pass and this issue also persisted. I observed the perfect pass throttle control directly to make sure it wasn't actuating.
Things we've checked or done so far:
1) Checked propeller (good)
2) Checked transmission fluid (good)
3) Checked engine oil (good)
4) Restarted the boat several times (no effect)
Is there anything common that might be causing these behaviors that I can look into first? Any rational order I should test solutions to cost effectively solve the problem? I greatly appreciate any help!
P.S. The boat had half a tank of gas and a friend is insisting that I may have water in the gas due to condensation overnight and I need to use STP. This doesn't seem quite right to me, but I'll try anything. Thanks!
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Replies:
Posted By: dgabler
Date Posted: June-06-2018 at 3:41pm
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fuel issues (bad gas/flow impeded/filter) is my first thought.
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Posted By: woodyelc
Date Posted: June-06-2018 at 4:09pm
When was the fuel filter replaced
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woodyelc
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Posted By: DefectiveDave
Date Posted: June-06-2018 at 4:30pm
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I replaced the fuel filter and the LPFP year before last. Is it time again?
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Posted By: woodyelc
Date Posted: June-06-2018 at 5:45pm
Yes We do it every year. Check for water in filter can. Pump could be getting weak. Need to check fuel presser.
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woodyelc
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Posted By: Bri892001
Date Posted: June-06-2018 at 6:29pm
Definitely read through this thread:
http://www.correctcraftfan.com/forum/forum_posts.asp?TID=25584&title=poor-mans-gt40-diagnosis" rel="nofollow - http://www.correctcraftfan.com/forum/forum_posts.asp?TID=25584&title=poor-mans-gt40-diagnosis
There are a few things that can cause this sort of problem. A fuel filter is one of them.
One common ailment is the infamous "little tube in the Fuel Control Cell." This can get a crack and cause these sorts of problems. That's not the only possibility but one of the cheaper and more common possibilities.
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Posted By: Bri892001
Date Posted: June-06-2018 at 6:30pm
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Also, I would add "GT-40" in the title of this thread. You'll be more likely to get some of the gurus to weigh in.
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Posted By: DefectiveDave
Date Posted: June-08-2018 at 12:57am
Thanks everyone. I'm unsure how to change to topic title.
I'll hopefully be able to take apart the FCC this weekend and see if the tube is cracked or otherwise damaged.
Also, if I remember correctly, the valve to check the pressure on the boat was damaged by the previous owner and I finished it off last year. I'll need to replace that before I can check the pressure.
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