I had some problems this past week with my tundra 600 ace out in my hunting areas. I usually run in standard mode and was having the sled miss gas it seams like. Iam driving along and then for one second no power then it takes off and you hear the beep beep beep and check engine lite comes on. The engine does not stall it keeps running and immediately you can stay on throttle and it will take off.
Today it got worse. I was starting to think I was gona be walking. In standard mode or eco mode it was really acting up. I never run it in sport mode and thought switch it to that. As soon as I did it ran straight home no problem. I could not cross a field without it acting up four or five times but when I switched to sport it drove straight back to town no problem.

Anyone had this problem before?

I was thinking it was not getting fuel but if that was the case the engine would quit. That does not happen it keeps running the whole time. I don’t believe the gas is contaminated blocking the fuel system as I went through all that this past spring and had the tank flushed, fuel filters replaced including the sock in the gas tank. At that time there was contaminated gas from an old slip tank but then the sled starved for gas so much it would just quit.

Iam thinking something electronic like the mode switch itself or the command module that communicates with the throttle switch.

I know it needs to be hooked up to computer but Iam alongway from dealership.

What has your weather been like? Any rain, thaw/freeze, or really cold (-20F or colder)? Did you run it hard in light fresh powder and then let it sit for a while?

you have no oil leaks? I have had my oil pressure sensor broke before and it would do that, started out slow then happened more often within a couple of weeks. Had to wait for a new one to come in and replace it.

I have no leaks no the problem has been happening for a week or so now getting worse. I run sled in fresh power and it sits outside till the next day. At first I thought it was a fuel issue and tried premium gas and gas line antifreeze but problem is getting worse.

Have you posted in the tundra forum on www.dootalk.com? Lots of good info and people in there.

I have had a similar problem with my Skandic 600 ACE. When the check engine light comes on it will run slow or run and stop as you described. I now run 1/3 can of isoheat in each tank of gas and it is not uncommon for me to have to thaw out my machine the day after I run hard in powder that kicks up lot especially if it gets cold. I also had my beeping happen when my brake stuck from being iced up. Think that light is the (!). That one took me a while to figure out because the break would release 95% or the way. I simply pushed it back the rest of the way and was good to go.

I would take another look at the fuel filters again. Mine did that last year and I cleaned the sock replaces the filter, within 200 miles I was having the same problem. Pulled everything again, and replaced, flushed tank again and so far no problems.
Also could be related to poor ground. check them and clean them.

I had a similar experience with my 2019 Expedition 900 Ace last year. She would run just fine until it warmed up then start cutting out. If you shut it down and let it cool off, it would run fine. Had a heck of a time duplicating the issue for the Dealer. I told them it only did it after it warmed up. It didn't do it cold. Replaced the fuel pump and up and running again.

"JMO........Since I started trapping with a 1969 Olympic and have had Elans, Skandics, Tundras, Polaris and several 4 strokes. I came to the conclusion that the older SIMPLE machines were more reliable than the new electronic 4 strokes. "

Source: Trapper of the Year.

I was out yesterday running a lake full of overflow thinking about the old machines I had in the past, I just pushed the throttle harder and blew through the stuff. In the old days I would have been screwed.
My back got stiff just thinking about it.
The 900 ACE Skandic WT didn't even slow down.

Did you have your rope-along with and all your survival gear with just in case? I wonder why you bother to carry that stuff?

Something that slipped my mind, when you have the fuel pump out take the two screws out that hold the small round cap on the pump, the pressure regulator is under that. Carefully clean the mesh if blocked. Mine was completely blocked off with a black hard residue.

Get a new one.

Yes I also had a poor ground while this was happening. I double grounded the battery and that solved the problem. I think Skidoo may have corrected the issue but it seems like a few of the Skandics around 2017 were having grounding problems. Not sure if Tundras were as well.

Funny you should mention that I had to use my booster pack on my truck Wednesday, Lucky for me I had it with me for my 4-stroke (just in case) Made me laugh because I had just added it to my essential carry kit. Came out of the bush to a truck that wouldn't start. Hooked it up and it worked like a charm.

I've heard so many stories like that Im glad I went back to a two stroke. Mine will go anywhere I need to go, but I still carry the rope along! If you are close to civilization those 4 strokes are nice, but if you are remote they can really cost you a lot in time and money.

Yeah, but those 2 strokes cost you a lot of money also. I had to rebuild the secondary on my Bearcat and was using a 550 Tundra of a friends for a few days while I waited on parts. While riding around I got to figuring fuel costs in my head. I usually put about 5K on a snowmachine a year (less this year since we haven't had any winter yet). I've used that Tundra with the 550 in the past and I usually average 4-5 mpg in it. I've used some old Skandics with the 550 and I thought they did better, but I never checked mileage on them. I get 10-12 mpg in my 1100 4 stroke Bearcat, while my buddies SWT with a 900 Ace gets 19-20. Not as much experience with the 600 Ace but I've put several hundred miles on a couple Tundras with them in Wyoming and they got around 20 mpg. The only 2-stroke I've ever been around that got that was the 600 Etec; and then you're right back to the same issues as the 4-strokes, EFI, no pull start, lots of electronics.

So if we figure it out at todays local gas prices, which are cheaper than they've been in the past and a lot cheaper than most of you in the bush are paying, it is about $2.25/gal, 5000 miles a year comes out at.

550 fan 1000 gallons= $2250
Bearcat Z1 500 gallons= $1150
600/900 ACE 250 gallons= $625

That saves a guy around $1625/year, which means in 5 years he has saved enough money on fuel in the 4 stroke to buy a brand new 550 Tundra and in seven years he has saved himself enough to buy a new Skandic 900 ACE.

That doesn't even take into account the fact that on a wet sticky snow day, particularly when I'm breaking trail, I can't carry enough gas on the 550 to make a day of it, when a friend of mine used to hunt off of one regularly he would carry two 5 gallon cans, there were quite a few times when he would use both of them and have to borrow my 2.5 gallon can to make it back. . . while I went on hunting.

All that being said, the 300 fan Tundras got about as good as my 4 stroke Bearcat (06-09, older models never got as good fuel mileage in my experience) but finding one of them that isn't worn out is a real trick. I don't like the no pull start backup on the 4 strokes, and the difficulty of working on them on the trail. But I've not had one leave me walking yet (well other than the time I put my Bearcat on its top in the creek without a comealong or winch, and I've walked out from a 2 stroke I've rolled over the mountain also.)

Frankly I've seen less problems with Skidoo motors than the other brands, and less issues with their 4 strokes than their 2 strokes. But I don't like not being able to work on them with the little toolkit of 4 wrenchs and a screwdriver on the side of the trail. I sure wish they would make them easier to jury rig to get home, but I'll take the reliability and fuel mileage over the alternatives.

Did you cumulate the added cost of the injection oil? Two jugs of oil here was $96.
As we get old it gets harder to move onto new equipment that we don't understand.
Looks like Mike's problem was a bad ground, his battery ground terminal was loose and his ground to his machine was corroded. He is testing on a run today.

They have a two stroke now that gets similar fuel economy to 4 stroke and it ain't skidoo. Supertech cost about $15 a gallon.

The reason they started using 4 stokes in Sno-go's was pollution, not performance.

No doubt the 4-strokes gets good milage. The problem I have seen is that when you have a problem you cant fix, then you are paying $110 hour shop rates. That discounts any savings you have gotten in milage. My new VK540 with the heated carb gets the same or better milage as the 900 ace. I've traveled with them enough to get a good comparison. The 600 ace does get better though.