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wont pull up a skier when hot |
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aquaman766 
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Joined: May-02-2010 Location: Niagara F, N.Y. Status: Offline Points: 30 |
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 Topic: wont pull up a skier when hotPosted: May-27-2025 at 8:08pm |
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My 1993 Nautique hesitates and backfires when pulling up a skier. Once the skier is up it runs fine. It only does this when the engine is hot. So the first skier gets up no problem but the second has trouble. If I back off the throttle quickly and then reapply quickly it will pull the skier up. My thought is carb trouble but it works fine for the first skier. It seems after the temps build under the engine cover it starts to fail. Could it be a bad coil? The boat has always been reliable. It has a 351 ,Holley carb, Mallory distributor
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Jonny Quest
Grand Poobah 
Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 3070 |
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Posted: May-27-2025 at 11:31pm |
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When was the carb rebuilt last? Hesitation or bogging is often a symptom of an accelerator pump circuit that is failing. Heat can also affect the carb. The carb and gasoline like to be cooler rather than warmer. If it was my boat, I'd start with the carb.
As far as the coil -- I've seen a bad coil do strange stuff when it gets too warm, so that is a possibility. I'm sure that others will join the conversation and provide additional insight. JQ
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2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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75 Tique
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Joined: August-12-2004 Location: Seven Lakes, NC Status: Offline Points: 6138 |
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Posted: May-28-2025 at 2:17pm |
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Not saying this is your problem, just throwing it out there for consideration. I spent a month last fall and a couple weeks this spring chasing a "carb" problem. Even put on a different (not new, just different) carb and boat misbehaved similarly with both carbs. The second carb ran good for an outing or 2 but then started failing just like the first one. Decided 2 bad carbs was not likely, so I dug a little deeper. Here are my lessons learned. - a bad coil can have symptoms very similar to carb/fuel problems. Big dips when accelerating, back firing, stalling, hard starts. Running fine at lower and higher RPM but really disliking that 2000-3000 rpm range. Running great at the dock, failing under load. - a coil having 2 good ohm readings does not necessarily mean the coil is good. There can be other problems not reflected in the resistance of the coils. - coil problems can be very intermittent. You might get one whole good ski outing in. You may get one whole good set in, but have it fail for the next guy. (I did not experience this, but I have read, as Rob mentioned, that a coil, once hot, may fail. Tho in your case, if it was going to fail with heat, I can't see why it would take 45 minutes to get that hot vs a few minutes for the engine to reach operating temps. (See comment on "intermittent" failure) After multiple efforts cleaning the first carb and one effort cleaning the new one, I researched the coil impacts. Bought a new coil and everything is good. I was quite relieved to have a $35 fix vs a $700 fix. (that's cheap enough that its almost worth trying it as a "start throwing parts at it" solution. Something I abhor and try to avoid.) |
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aquaman766
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Joined: May-02-2010 Location: Niagara F, N.Y. Status: Offline Points: 30 |
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Posted: May-28-2025 at 7:18pm |
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Thanks guys. I will start with a coil then get the carb rebuilt if needed.
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aquaman766
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Joined: May-02-2010 Location: Niagara F, N.Y. Status: Offline Points: 30 |
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Posted: June-16-2025 at 6:00pm |
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I just wanted to let you guys know that my problem was a bad ignition coil. I swapped it out and we skied this morning. It ran great, pulled strong and idled smoother. I guess the heat build up under the engine cover made the coil whack out. Thanks for the help. This site has never let me down.
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pjsmoreno
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Joined: April-25-2016 Location: Liberty, Mo Status: Offline Points: 211 |
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Posted: June-23-2025 at 10:05am |
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Great information guys! Thanks for the info.....
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