98 ZR 600 EFI bogging a little, using fuel and backfires - Snowmobile Forum: Your #1 Snowmobile Forum
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Old 01-03-2009, 10:24 AM   #1 (permalink)
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98 ZR 600 EFI bogging a little, using fuel and backfires

Hi all, in my second year of owning my ZR MN finally got lots of snow so we took a family trip north. Anyway here is my situation, this week the temp ranged between -5 and +5, when I start it, the first two pushes of the throttle bogs, the first push a lot then the second just a bit and then it takes off and drives ok with a few sputters at trail speeds. It also took 4 pulls to start it and it never takes more than 2. It is also using a lot more more gas than usual and then when I shut it down it backfires. We had to cut the last ride short because I could practically watch the gas guage moving down in just a few miles with no gas nearby.
I thought the EFI was more bulletproof but I guess I am wrong. Anybody know what could be wrong here? The sled has 1550 miles and got a top end factory recall rebuild at 800 miles. Other than the newer top end, it is original and stock.

Thanks,

-Jason
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Old 01-03-2009, 05:57 PM   #2 (permalink)
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I am having the same problem with my 98 powder special 600 efi.. runs good to about a quarter throttle then boggs out and will backfire from time to time.. Ok if your sled will idle start it let it idle and on the bottem of your computer theres a red light.. now like mine when i let it idle the red light blinks. count how many times it blinks thats your diagnostics its just like a vehicle its giving you a code.. now thats all I have so far with mine im just waiting on what my code means..Im sorry I dont have any more info for you.. But I thought this could help a little or at least to get you on the right track..
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Old 01-03-2009, 11:35 PM   #3 (permalink)
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I'd have to see it...
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Old 01-04-2009, 07:06 AM   #4 (permalink)
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Check your reeds! What do your plugs look like! On that code the first number of blinks like 2 then a puase the more like 3 would be a 23 code, then it will repeat or give the next one! Call your Stealler a see what it is!
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Old 01-04-2009, 08:44 PM   #5 (permalink)
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I am having the same problem with my 98 powder special 600 efi.. runs good to about a quarter throttle then boggs out and will backfire from time to time.. Ok if your sled will idle start it let it idle and on the bottem of your computer theres a red light.. now like mine when i let it idle the red light blinks. count how many times it blinks thats your diagnostics its just like a vehicle its giving you a code.. now thats all I have so far with mine im just waiting on what my code means..Im sorry I dont have any more info for you.. But I thought this could help a little or at least to get you on the right track..
let me know what you find please, I'm having the same problem
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Old 01-11-2009, 04:06 PM   #6 (permalink)
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Update

Ok, I think I figured out what is going on here. Before my last trip I had to top off the oil resovoir but I was out of the Arctic Cat greenish oil and had to use the Arctic Blue budget oil I had on hand. I forgot I had done that. My thinking is that the blue oil and the green oil are not working well together. I first cleaned the fuel injectors with the fuel additive I mentioned in an earlier post and drove a while, no more bogging but still backfiring when shutting down. I then checked the plugs and they had a lot of oil on them. I changed them out and it runs perfect, all symptoms gone and it performs with just a slightly better acceleration...for now. I did look at the computer but did not see where any flashing lights would even be. Do you have to unscrew the computer and look underneath?

-Jason
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Old 01-11-2009, 07:47 PM   #7 (permalink)
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I just picked up a 98 zr 600 efi snow pro and it runs great but will from time to time bog a little when i am crusing and hit the throttle hard. also will do that when its cold. I also picked up a zr 700 with flat slides that runs like crap and i wish it had efi - there is about 80% less crap to go wrong with efi than carbs.
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Old 01-11-2009, 07:56 PM   #8 (permalink)
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there is about 80% less crap to go wrong with efi than carbs.
Agreed, I am suprised carbs have been used as long as they have. I just want to get on and ride, no messing around with primers and trying to keep the carbed machine running on cold starts plus the throttle response is instant. I leave carb mods to more experienced riders. Unfortunatly for my wife, I couldn't find an EFI 2-up. What is the sno pro edition consits of? Adjustable shocks, opaque gas tank? Anything else?
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Old 01-11-2009, 07:57 PM   #9 (permalink)
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let me know what you find please, I'm having the same problem
I am having a similar problem, but it runs fine when it gets above a certain rpm. as for the bogging after 1/4 throttle, it may be your throttle safety switch bushings(a buck at the steeler)that was a big problem i had, now it lacks a bit of power, and lags on the bottom end, till 6500-7000rpm. now that i think about it a bit, i think im going to check my plugs after a quick ride, but those plugs are only 200 miles old(1 week)
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Old 01-11-2009, 08:05 PM   #10 (permalink)
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The led light is on the bottom of the computer and it sounds like you found out what was wrong with your sled.. Im still confused on mine but what I did find out is that if any of the sensors on the sled go out like your air intake temp sensor or the throttle position sensor crank sensor the sleds computer will go into what they call a "limp home mode" which means that you will have throttle but very little and the performance will be gone.. It also richens the oil mixture to the extreme so that your motor wont burn up from running lean..and mine is actually in the limp home mode when i start it.. and my computer led light blinks once and then starts the sequence over and the code says it has to do with my throttle position sensor.. but I havent had time to play with it yet but when I find out what is all wrong I will be sure to let you guys know...

matt
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Old 01-13-2009, 06:24 PM   #11 (permalink)
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Agreed, I am suprised carbs have been used as long as they have. I just want to get on and ride, no messing around with primers and trying to keep the carbed machine running on cold starts plus the throttle response is instant. I leave carb mods to more experienced riders. Unfortunatly for my wife, I couldn't find an EFI 2-up. What is the sno pro edition consits of? Adjustable shocks, opaque gas tank? Anything else?
it is fast, its not a 2up, and does have adjustable shocks
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Old 01-13-2009, 11:28 PM   #12 (permalink)
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and my computer led light blinks once and then starts the sequence over and the code says it has to do with my throttle position sensor..
matt
I also have an EFI machine. Loved it for 2 seasons. I had a screw back out of the throuttle position sensor and it allowed the sensor to pop behind the throttle. This put the machine in limp home mode because it couldn't detect position. Next thing I knew the stator low idle coil is fried and it won't start. This all happened in a few miles on the trails last year in the UP. I now have the stator coil replaced and it starts fine. I drove it out and it acted like it wanted to die a couple times. Not sure why yet. (Bitter cold tonight.) When I pull the cord I get one flash out of the ECU led but only once every time I pull it. It doesn't continue to flash after it is started. Is this normal? The manual makes it sound like you only get a code after you test it with an EFI analyzer.
Thanks for any info any of you may have.
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Old 01-14-2009, 01:43 PM   #13 (permalink)
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The manual that came with my ZR EFI was unfortunatly for a carbed sled. I haven't been able to get my hands on an EFI version yet. Where exactly is this blinking light. My assumption is that you open the little tool box, and the black box in there has an LED somewhere? How many miles were on the sled when the stator went out?
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Old 01-14-2009, 03:34 PM   #14 (permalink)
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The LED will be on one of the sides (usually the right side) of the ECU box.
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Old 01-14-2009, 06:45 PM   #15 (permalink)
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I own a 98 EXT. My ECU is just above the breather box. It actually says ECU on one of the stickers. It is approximately 5"x10"x2". On the rigt side (not bottom) toward the center of the sled is a small red LED light. Again this is an EXT not a ZR. Look at Alpha-sports.com. There is a picture of the ECU in the electrical section. My led is on the same side as the line leading from the "8" in the picture.
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Old 01-31-2010, 11:11 AM   #16 (permalink)
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I never did post the actual solution to my problem and I hate when threads never reveal the solution. I have seen these symptoms on here with ZR's a lot lately. In my case it was simply the usage of the Arctic Blue oil. I only finally changed back to the Arctic Cat non-synthetic 50:1 injector oil a month ago and every symptom completely went away within a few miles of driving. Even though a gallon of it is over 30$, which is of course overpriced, it was the best 30$ I have spent on this sled. Because it seemed so unlikely that this was oil brand related, this would have been step one in my troubleshooting. I just backtracked any changes I made prior to symptoms and saving money by changing oils was the last thing I had done. Luckily step one solved it. The Arctic Blue oil works flawless on my carbed sled so I guess it is still a mystery as to why the ZR prefers one oil over another.
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Old 01-31-2010, 11:20 AM   #17 (permalink)
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my sled backfires on start ups, and bogs also... i narrowed the bogging down to the TSS.. but as for the backfire im not sure.. im running arctic cat synthetic oil also
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Old 01-31-2010, 12:36 PM   #18 (permalink)
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The single biggist issue besides the stator is the fuel presure regulator! It has been my opinion that as they get older the diaphram must get stiffer and presure raises! I bet you have 40 psi! I have made up an adjustable fuel presure regulator that is cheaper than just a stock OEM replacemant!
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Old 03-07-2013, 10:24 AM   #19 (permalink)
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Originally Posted by jkust View Post
Hi all, in my second year of owning my ZR MN finally got lots of snow so we took a family trip north. Anyway here is my situation, this week the temp ranged between -5 and +5, when I start it, the first two pushes of the throttle bogs, the first push a lot then the second just a bit and then it takes off and drives ok with a few sputters at trail speeds. It also took 4 pulls to start it and it never takes more than 2. It is also using a lot more more gas than usual and then when I shut it down it backfires. We had to cut the last ride short because I could practically watch the gas guage moving down in just a few miles with no gas nearby.
I thought the EFI was more bulletproof but I guess I am wrong. Anybody know what could be wrong here? The sled has 1550 miles and got a top end factory recall rebuild at 800 miles. Other than the newer top end, it is original and stock.

Thanks,

-Jason
Hey, I had the same problem with my ZR 600 EFI. Under the handle bar mount, where all the wiring runs through, there should be a wire with the colors black, brown, and purple. Unplug it, this is the wire for your kill switch, you see older arctic cats have a safety future built into the kill switch, when the safety future wears our form years of use, then the sled stars to bog, because the turns off the machine when its flipped upside down or on its side, with this worn out, it cause the sled to bog and want to die. Simply on plugging the cable should stop this from happening. There is no need to by-pass the wires cause itís already built in hens the three wires. This means you can no longer use your kill switch and will have to use your key ever time. PS. Hope this information helps you as much as it has helped me, and if you are still having problems then I know other solutions to fix a zr bogging problem.
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Old 03-08-2013, 07:30 AM   #20 (permalink)
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The manual that came with my ZR EFI was unfortunatly for a carbed sled. I haven't been able to get my hands on an EFI version yet. Where exactly is this blinking light. My assumption is that you open the little tool box, and the black box in there has an LED somewhere? How many miles were on the sled when the stator went out?
Hey man, I found you a service manual for your zr 600, just looking out for one of my own, you know a zr driver . Anyway donít really know if itís the right one yet but if it is shoot me a message. Here is the link CLYMER ARCTIC CAT 440 550 580 SNOWMOBILE MANUAL 90-98 | eBay

Good luck
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