Running Rich? Loads-Up at Take-off
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=31257
Printed Date: October-08-2024 at 7:19pm
Topic: Running Rich? Loads-Up at Take-off
Posted By: Jonny Quest
Subject: Running Rich? Loads-Up at Take-off
Date Posted: August-20-2013 at 12:57am
1994 Ski Nautique O/B. 5.8 Pro Boss - throttle body fuel injection.
For the last 6 months or so, the boat seems to "load up" when I'm idling and waiting for the skier. If I go from idle to W-O-T to pull up a skier, the boat seems to bog down at take off. After the RPMs run up, the boat takes off like a scolded dog.
One "trick" helps a little: If I go to neutral and rev the engine a couple of times to 3,000 RPMs and then immediately engage the transmission when the RPMs come down and then take-off, the boat seems to run much better.
The engine exhaust looks a little too dark gray/black to me and my first thought is that it is running a little rich.
Any suggestions? If it is running rich, can the TBI be adjusted? I was a wrench-turner back in the 1970's and my experience is with wheeled vehicles and carbureted vehicles, so EFI is a little "black magic" at times.
Thanks,
JQ
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Current
2003 Ski Nautique 206 Limited
Previous
2001 Ski Nautique Open Bow
1994 Ski Nautique Open Bow
Aqua skiing, ergo sum
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Replies:
Posted By: Bri892001
Date Posted: August-20-2013 at 12:49pm
Your TBI should have an actual injector that is squirting into the throttle body.
My only suggestion is that maybe this is hanging open or is gunked up somehow. Maybe gas is just dribbling in and not spraying in nice like it should.
Unless this injector corresponds to another one in the automotive or marine world, your choices could be kinda slim.
Of course, maybe it could be cleaned somehow as well with a fuel tank additive etc.
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Posted By: Jonny Quest
Date Posted: August-20-2013 at 5:59pm
Yea, clogged fuel atomizers was my first thought. I've run several fuel additives through (Lucas, Sea-Foam). No help. My sense is that the fuel atomizers are just getting old. From what I can see, the options to repair are pretty slim as parts appear to be hard to come by.
I may just opt to convert to Mallory ignition and carburetor.
JQ
-------------
Current
2003 Ski Nautique 206 Limited
Previous
2001 Ski Nautique Open Bow
1994 Ski Nautique Open Bow
Aqua skiing, ergo sum
|
Posted By: Dreaming
Date Posted: August-21-2013 at 12:07am
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JQ, have you checked your fuel pressure? if it is low, the injectors would not atomize correctly. I have a pro boss that I am working on, and might be interested in your electric fuel pump arrangement if they work and you do decide to swap out for a carb.
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