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wakemeup View Drop Down
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    Posted: September-06-2009 at 2:38am
I've got a 99 Air Nautique with a Pro Boss 351, 310 HP motor. The boat starts fine when cold but when it is warm I have to hold the key in the start position for about 5 seconds or so before it starts. It doesn't always do this, there is no pattern. It has always started but having to "turn it over" so much before it starts is annoying. Any insight from anyone as to whats happening is appreciated.
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Wakemeup

1988 Ski Nautique

1999 Air Nautique
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jerry@vail.net View Drop Down
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Check out this thread:
http://correctcraftfan.com/forum/forum_posts.asp?TID=14377&PID=176239#176239
Is this similar to your symptoms?
Jerry
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wakemeup View Drop Down
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Mine has never stalled or ran rough after starting. The only problem is you have to hold the key in the start position way to long before it starts. Anyway let us know what the PCM guy says.
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Wakemeup

1988 Ski Nautique

1999 Air Nautique
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behindpropeller View Drop Down
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I think that is pretty normal on the 310 hp engines......

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wakemeup View Drop Down
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Originally posted by behindpropeller behindpropeller wrote:

I think that is pretty normal on the 310 hp engines......


Thats unfortunate! Everytime someone else drives the boat so I can board I have to tell them to hold the key in the start position until it fires. My friends Sanger with a Chevy Mercruser lights within 1/2 a second to holding the key in start every time. Oh well thats what I get with owning a Ford. That Chevy 350 is the best engine ever built for any application, its bullet proof.
Wakemeup

1988 Ski Nautique

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SNobsessed View Drop Down
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My 351 starts with that 1/2 second period. If your timing is set too advanced, that will make it start hard when hot. I backed mine off 1 degree (to 9) & that helped it start easier.
“Beer is proof that God loves us and wants us to be happy.”

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wakemeup View Drop Down
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Originally posted by SNobsessed SNobsessed wrote:

My 351 starts with that 1/2 second period. If your timing is set too advanced, that will make it start hard when hot. I backed mine off 1 degree (to 9) & that helped it start easier.


I'll give that a shot. Thanks for your input.
Wakemeup

1988 Ski Nautique

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gun-driver View Drop Down
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Has nothing to do with being a Ford. My GT-40 starts on the first crank every time hot or cold. Start looking deeper than the name.
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beck View Drop Down
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it could be vapor locking, my 94 sport nautique does that, we just leave the engine cover open after we use it and it starts up fine later
1994 Sport Nautique 21ft 5.8L EFI Pro Tec Injection 310HP
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8122pbrainard View Drop Down
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Brandon,
I'd wager to say it's not vapor locking (real hard to do on a boat) but rather your Pro Tech suffering from heat soak.


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beck View Drop Down
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well we do that and it works everytime lol, if we dont keep it open after using it then it doesnt start 15 minutes later
1994 Sport Nautique 21ft 5.8L EFI Pro Tec Injection 310HP
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Fl Inboards View Drop Down
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Originally posted by 8122pbrainard 8122pbrainard wrote:

Brandon,
I'd wager to say it's not vapor locking (real hard to do on a boat) but rather your Pro Tech suffering from heat soak.


Did we have protech in 99? I thought that went away in about 94. I to agree that vapor lock is probably not the cause.
I take it this is a HO carb motor? And not a GT-40.
Hobby Boats can be expensive when the hobbyist is limited on their own skill and expertise.




1993 Shamrock "fat" 20. 2008 Nautique 196 5.0
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TRBenj View Drop Down
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Originally posted by Fl Inboards Fl Inboards wrote:

Originally posted by 8122pbrainard 8122pbrainard wrote:

Brandon,
I'd wager to say it's not vapor locking (real hard to do on a boat) but rather your Pro Tech suffering from heat soak.


Did we have protech in 99? I thought that went away in about 94. I to agree that vapor lock is probably not the cause.
I take it this is a HO carb motor? And not a GT-40.


Originally posted by beck beck wrote:

it could be vapor locking, my 94 sport nautique does that, we just leave the engine cover open after we use it and it starts up fine later
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wakemeup View Drop Down
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Originally posted by beck beck wrote:

well we do that and it works everytime lol, if we dont keep it open after using it then it doesnt start 15 minutes later


I take it you just idle the boat when you are switching skiers/boarders in the open water. I am fairly new to boating but was taught to turn the motor off anytime someone was going in or out of the boat, especially around the swim step. I'm constantly turning the boat on and off.
Wakemeup

1988 Ski Nautique

1999 Air Nautique
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beck View Drop Down
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ya we just leave it run, and then you know if your out there for the weekend and you take it out, open up the engine cover and just leave it open until you use it next, let me know how that works for you
1994 Sport Nautique 21ft 5.8L EFI Pro Tec Injection 310HP
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Originally posted by wakemeup wakemeup wrote:

Originally posted by beck beck wrote:

well we do that and it works everytime lol, if we dont keep it open after using it then it doesnt start 15 minutes later


I take it you just idle the boat when you are switching skiers/boarders in the open water. I am fairly new to boating but was taught to turn the motor off anytime someone was going in or out of the boat, especially around the swim step. I'm constantly turning the boat on and off.


We still need to know if it is a GT-40 or a carb motor????
Hobby Boats can be expensive when the hobbyist is limited on their own skill and expertise.




1993 Shamrock "fat" 20. 2008 Nautique 196 5.0
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