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Old 01-22-2010, 12:15 AM   #1
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Fuel designation connector

Hi everyone, I have a question about the Fuel designation connector on my
New used 99 ZL600 EFI

From my understanding if you connect it (the yellow wire), you will lean out the air/gas mixture, and if you disconnect it, that will richen the mixture. And the reason for this option is for when you use oxygenized gas containing up to 10% ethanol.

Now my question is, will 92 octane with up to 10% ethanol allow me to keep this plugged in or will there still be a concern about detonation? In other words, will the higher octane rating compensate for the ethanol mixture?

My goal is to lean the motor out as much as possible, without detonation for maximum performance.

Thanks.

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Old 01-22-2010, 08:02 AM   #2
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Higher octane will not make up for the ethanol. Keeping wire hooked up you should be fine, just be careful in cold weather running ( 10 F. or less). Just my .02
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Old 01-22-2010, 08:07 AM   #3
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X2. Run it plugged in!
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Old 01-22-2010, 09:35 AM   #4
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I guess I will try to run it plugged in on 92 octane with ethanol, and I will just keep a close eye on my spark plugs, like I would if I would use a smaller jet in a carburetor.

I am wondering, when they say engine damage can result from plugging it in with an oxygenized gas , our they talking about pre detonation from having to lean of a mixture with ethanol gas, or is there another concern that I am not thinking of?

What effect dose the colder weather have?


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Old 01-22-2010, 11:05 AM   #5
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I don't know that I would take the advice of "leave it plugged in" Plugged in is for regular gas, so if you are using ethanol gas, you could run too lean.

That being said, I have often been tempted to leave mine plugged in as my EFI seems to run rich (Fairly dark colored plugs) But then I remind myself that it doesn't foul plugs, and that plugging it in MIGHT get me 2-3 more MPH and it just doesn't seem worth it.

So, my advice would be leave it unplugged
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Old 01-22-2010, 11:16 AM   #6
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Unplugged ! 10% ethanol in almost every gas station . & Run 87 ~ That is what it calles 4
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Old 01-23-2010, 09:55 AM   #7
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SnowHo, I did some research on this and all my manuals say the same, up to 10% ethanol connect, over 10% disconnect. I have a combined 12,000 miles on my 4 EFI cats ranging from 1999-2002 all 4 with wires plugged in, never any issues. Hope this helps.
This is What the service manual states:

Quoted directly from the 2003 Arctic Cat service manual:
Recommended Gasoline for EFI models.
"The recommended gasoline to use in these snowmobiles is 87 minimum octane regular unleaded. In many areas, oxygenates(either ethanol or MTBE) are added to the gasoline. Oxygenated gasolines containing up to 10% ethanol or up to 15% MTBE are acceptable gasolines. Do not use gasolines containing methanol.
NOTE: When using the recommended gasoline(above), the Fuel designation connector at the ECU must be connected.
NOTE: When using oxygenated gasolines (over 10% ethanol or over 15% MTBE), the Fuel designation connector at the ECU must be disconnected.
When using ethanol blended gasoline, it is not necessary to add a gasoline antifreeze since ethanol will prevent the accumulation of moisture in the fuel system.
Do not use white gas or gasoline containing methanol. Only Arctic Cat approved gasoline additives should be used.

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Old 01-27-2010, 05:23 PM   #8
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I need snow before I can try anything.

I am going to plug it in and watch a new set of spark plugs. But if the overall performance is just a few MPH faster than I will probally leave it unpluged.

Unless the spark plugs look good, because right now with it unpuged the spark plug looks rich.
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Old 11-08-2010, 05:06 PM   #9
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 Quote: Originally Posted by SnowHo View Post
Fuel designation connector

Hi everyone, I have a question about the Fuel designation connector on my
New used 99 ZL600 EFI

From my understanding if you connect it (the yellow wire), you will lean out the air/gas mixture, and if you disconnect it, that will richen the mixture. And the reason for this option is for when you use oxygenized gas containing up to 10% ethanol.

Now my question is, will 92 octane with up to 10% ethanol allow me to keep this plugged in or will there still be a concern about detonation? In other words, will the higher octane rating compensate for the ethanol mixture?

My goal is to lean the motor out as much as possible, without detonation for maximum performance.

Thanks.
how did u make out did it work ??? im havin trouble findin the correct wire color !!!
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