97 580zr EFI injector question? - Snowmobile Forum: Your #1 Snowmobile Forum

ZRNUT · 12-11-2012, 07:30 AM

I'm still dealing with the high fuel consumption from last season. I've already went through the clutching and rebuilt the skid I've put new boots on the fuel rack. I'm leaning towards the injectors. I've swapped out the complete fuel rack and now i'm wondering. Does the symbols on the fuel injectors mean anything in regards to the symbol on the ECU?
Could the fact i switched out the injection system be my poor fuel mileage?
I've bought the adjustable reg from KC Cats and i still can't get any where near the mileage that i get from my other sled which is the exact same. When we ride together i will be almost dry and the other sled will have more than a half of tank left.
I'm stumped i do ride harder but not to that extreme. I'm going maybe 60 miles on a tank and that's on a good day it's been as bad as 50 miles already.

Grudman · 12-11-2012, 10:04 AM

Something not right. Yes the injector color has to match the ecu color. Mine are yelow dots. I get about 90 miles to a tank on mine. Sound like something is slipping clutch.

How many miles on the sled how the compression?

Does it seem to have lost power.

ZRNUT · 12-11-2012, 11:43 AM

I rebuilt motor on both sleds neither have more than 1k on them. There is no slipping that i can tell since this sled will pull the skis off the ground. Like i said in my original post i've rebuilt both drive and driven and the skid was rebuilt last season. But thanks for the info on the injectors. I'm going to look at them tonight to see what there are in regards to my ECU. I know the ECU is a triangle.

**RJ Gleason** · 12-11-2012, 12:17 PM

Compare engine rpm to the other sleds at a set speed, say 45mph, and see if they are the same or how close they are.

This will tell you if you might need to make some clutching changes or maybe just a gearing adjustment.

ZRNUT · 12-11-2012, 12:57 PM

I will check that out as soon as i can. but i know from last year before i put them away my engagement rpms were almost equal on both. I never checked the running speed though. This has been a trial and error thing for last two seasons now. I have tried all kinds of stuff but nothing is making a difference.
I can't even use this for any ditch bump'n since there aren't enough gas stations around.

**kccats** · 12-11-2012, 04:07 PM

The speed / RPM will also tell you if they have the same gearing? Are both sleds 580 efi's? Most symbols I've had were the Black squares!

ZRNUT · 12-12-2012, 06:10 AM

KC yes both 580zr's i looked last night and my ECU has a triangle on it but the Injectors have squares on them. Didn't find any color on them like Grudman say's there are. These just have a symbol on them. I will check the RPM to Speed ratio on Friday, I'm off of work so it will be daylight out. But I'm not understanding what or why Cat would build each fuel rack with a different symbol on the injectors. It would make more sense to have all the injectors work in any rack wouldn't it? I thought the ECU controlled the amount of fuel being supplied all the injector did was deliver it. .

**RJ Gleason** · 12-12-2012, 08:20 AM

But the symbol identifies the orifice size and the ECU must match or it will not meter correctly which can cause over fueling or even a lean condition.

ZRNUT · 12-12-2012, 10:45 AM

That could be where my problem is then.
I checked the injectors in my other fuel rack that was in the sled originally and they were squares also. So are you saying i should go to my local salvage place or the dealer Ouch! That could be expensive and but two injectors that have the Triangle on them?

**RJ Gleason** · 12-12-2012, 11:50 AM

Yep!

**kccats** · 12-12-2012, 08:09 PM

OK well I have several sets! I'll have to go see which I have! Check and see what each of yours are?

Grudman · 12-12-2012, 08:43 PM

Maybe zr were little different. Mine has a yellow dot on the ecu and the injector has the same color.

1996 Arctic Cat ZR 580 EFI Snowmobile Fuel Injector Injection | eBay

cant find a 97 injector on line!

**kccats** · 12-13-2012, 06:52 AM

The ZR, EXT and Pantera would all have different and possibly different between years! There are 3 different Black square, Yellow circle and a triangle!

**RJ Gleason** · 12-13-2012, 07:17 AM

Doesn't matter what year the injector came from, just that the symbol on it matches the ECU.

Try here.
Al's Snowmobile Parts Warehouse - Snowmobile Parts, Snowmobile Parts, and More Snowmobile Parts

ZRNUT · 12-13-2012, 08:17 AM

I looked at the dealer here locally. Wow. $319 ea I might be better off buying an ECU that matches my injectors. I have a couple of buddies looking into some possible used ones. I'm going to the Sled Salvage place here today to see what they have,. Fingers crossed.
I will be testing out the Speed to RPM's on Friday so that might also be some of the issues.

ZRNUT · 12-13-2012, 08:22 AM

Quote:

Originally Posted by kccats

OK well I have several sets! I'll have to go see which I have! Check and see what each of yours are?

Both my sets are the squares. When i originally bought this sled it was running as a 1/8th mile drag sled. So i'm wondering if they had purposely put that injectors in there knowing it dumped excess fuel. So when i had the issues with the fuel rack i pulled it and bought the one i did to match not knowing that the had to match the ECU. Would that make Sense to you?

**RJ Gleason** · 12-13-2012, 12:14 PM

If Al's has them, you could possibly get them cheaper is you offer to send the ones that you have [core].

ZRNUT · 12-13-2012, 01:17 PM

Quote:

Originally Posted by RJ Gleason

If Al's has them, you could possibly get them cheaper is you offer to send the ones that you have [core].

I checked Al's has a price of $320ea.. What i'm thinking of doing is just buying an ECU with the Square on it to match the injectors. I can get just the box for about $75 here at the salvage place. But do i need to change out the Sensors also or do theses swap out with any ECU? The way the rest of this has went it won't surprise me if they are locked to a certain ECU also.

Grudman · 12-13-2012, 05:06 PM

Arctic Cat ZR 600 Mountain ZL Snowmobile Throttle Bodies EFI Injector Sled | eBay

Here is what you need. 3005 077 injectors.

or

http://www.ebay.com/itm/Arctic-cat-I...42230b&vxp=mtr

**kccats** · 12-13-2012, 08:06 PM

If all yours are square whats the problem?