Let's revisit the "bog" issue

[NM]

Has anyone really pin pointed why the Pro's will randomly bog out like someone hit the kill switch?
I have heard many arguements, but nothing definitive.

I think the fuel pump is borderline on these sleds, and others have mentioned exhaust valves, injectors, throttle position switch, throttle position sensor, etc.

Let's get this figured out before this fall.

 

[Rick!]

Testing a grass dragger last night - codes say TSS. Putting in a new one tonite and re-running.

UPDATE: TSS took care of cut out thingy, now rolls over dead at 8600. Good thing it only has to go 600 feet.

 

[NapaMatt]

I think a huge Player in this Was Throttle Slack.. In Is there any.. or not enough or Too Much.. From Factory..

Tighten it up a tad.. Bog Goes Away!!


My .02

 

[black swan]

mine was due to the TSS being out-of-calibration, ....too tight or too loose...not sure.
dealer did the re-alignment, bog GONE!!..would cut out at 1/2 to wot, or when getting off throttle.

Dealer order new throttle block, but have yet to need to install it.

 

[mnrmkrb]

I had the problem also, my dealer did the normal thing injectors, kill switch that sort of thing.I live in MN and go out west 5-6 times a year and it would only act up 3-4 times per trip, so hard to reproduce.In Feb ordered a SLP pipe and Power Comander 5 mapped by SLP went out twice in March and 1 time in April it has not happened since.I talked to a respected moter guy that does alot of work on skidoos.His thought was that Polaris may have had a lean map to meet emissions and SLP does not have the same emission requirements.Just some thoughts

 

[08Alaska800]

New injectors took care of my bog.

 

[NM]

I find it interesting that so many different solutions remedied the same problem. I think that replacing the injectors could not fix it. A injector is a simple device that opens and closes with electrical pulses. They can become contaminated and work poorly, but it doesn't seem like a feasible fix. I think that something else has to be adjusted when the injectors get changed that solves the problem. I am leaning towards the TSS. It is reasonable to think that the shop must set throttle cable tension every time they have the throttle bodies out, and they must pull TB's to change injectors. This is just a theory of course.

 

[TurboMatt]

I find it interesting that so many different solutions remedied the same problem. I think that replacing the injectors could not fix it. A injector is a simple device that opens and closes with electrical pulses. They can become contaminated and work poorly, but it doesn't seem like a feasible fix. I think that something else has to be adjusted when the injectors get changed that solves the problem. I am leaning towards the TSS. It is reasonable to think that the shop must set throttle cable tension every time they have the throttle bodies out, and they must pull TB's to change injectors. This is just a theory of course.

NM, did you experience this problem with your sled? stock,before boost-it, after boost-it, still??????

 

[NM]

NM, did you experience this problem with your sled? stock,before boost-it, after boost-it, still??????

We only rode it one day in stock form and I do not believe it bogged at all.

Of course when we were going through the tuning process there were some runability issues, but we pretty much have them taken care of.

The problem is that we can run it up the same hill 19 times and it will run perfect, then for some reason the next pass it will die like someone hit the kill switch, then only recover after all speed is lost. This is an example of course.

I rode with a stocker last spring, and his did it at least 8 times a day. I know it is common.

 

[SNOWMANN]

Injectors for mine, started randomly around 400 miles, by 500 I couldnt even ride it was so bad, so not very random.

 

[MORSNO]

Could it be the rev limiter caused by not having enough clutch weight and over reving on the top end causing it to bog? Changing out the weights is easier and cheaper than injectors if that is the cause.

 

[AKSNOWRIDER]

NM, From some initial testing I did on mine for clutching I found you could easily get both a full throttle and even a part throttle bog if you are even a touch to light on clutch weight..polaris has the rev limiter set really tight on the pro, I found if you hit even (guage has shown anything from 7900 to 8150 when it bogs yet memory says 8300+, meaning the guage isnt registering quick enough to keep up with the motor) 8350 on the memory record feature you will most likely get a bog under a full throttle climb in deep snow if you unload the track at all(say a bump mid hill)..I was able to isolate this down to an over rev issue by simple stopping and adding 1 gram of weight(and reproduce it by removing the 1 gram again(mtx weights)..I also found I could induce this same bog at part throttle on a packed trail if i was light on weight(wouldnt even try to run past half throttle), on a ride where I had clutched the sled for the higher elevation we would be riding but unloaded at quite a bit lower elevation...polaris says the limiter comes on at 8500..I think it starts feathering in at about 8400..thus when you are clutched a little light you can hit the limiter when you unload the track suddenly...I have also noticed in certain snow conditions that I can get an exhaust induced bog when sidehilling with the exhaust against the hill(have only been able to do that on 2 rides..but it was consistant both times)could side hill all day with the exhaust on the high side but as soon as it went to the hill side it would dead bog if you tryed to pull more then about 3/8 throttle..have a extension i built for the exhaust deflector but havent put it on the sled yet..hoping that cures it(our edge chassis would do the same thing until we lengthened the deflectors on them as well)
As for the injector caused issues..I agree, not likely since most any malfunction would be pretty consistent and not so hit and miss as most of the reports you hear about, I agree it is most likely the tss causing the issue and as part of the injector change its getting reset...thus fixing the issue....mike

 

[m8sandman]

mine would run up to 7200 and then lose power, bog, until 6500. could do it all day long, found a blown powervalve base gasket. changed that and the injectors and ran spot on. never another bog. did the work myself, nothing else was touched to solve mine...

don't think all the "bog" issues are caused from the same issue or have the exact same symptoms. they are all just getting put in the same catagory. like peeps hitting the rev limiter, how can you not know your over revving your sled??? wouldn't this be the first thing you would check after changing weights? seems pretty easy to look at the tach and see the power loss happens only when your r's are too high or at the very end of the rpm limit... especially with the memory feature in the tach. i know i watch mine constantly or after the problem suddenly appears after you've changed something. seems the first thing to do would be to put it back the way it was and see if the problem still exists. but seems some would rather fight the new problem than to trouble shoot it!!! this is what i'd call the self induced bog!
think the varied amount of fixes for the same claimed problem is proof in itself.

 

[Snow Snake]

I had the same problem the bog you are talking about is like hitting the kill switch and you really hope you are not standing up when it hits. My dealer found water in the TPS wiring harness, the next time it was the throttle safety switch the time after that it was the kill switch. Every time I would go pick it up from the dealer it would run great for a half of the day to all day but the problem would come back. There was never a code that would come up and by the time I would get it to the dealer it was working fine. It would always start out the same with a real rough idle or die at an idle. Polaris did come up with the idea of adjusting or replacing the TPS and after that it started working.
Now it won’t hold its RPMs, it will pull as low as 7200, the dealer said he as a couple others that are not turning the RPMs and is working on it. Most of the sleds he has set up have the same set up and are working great, anybody have any ideas?

 

[F-Bomb]

It appears as if there are several mysterious actions that are all causing some sort of intermittent interruption that we feel as a BOG. Mine did it as a bone stocker several times and a few of them were in pretty hairy situations as well as a couple times in super deep powder in the flats (bad news to get stuck when there is no gravity to assist you).

Still did it after we messed with clutching and checked all the standard stuff like TPS, codes, wiring, ect ect.

I don't claim this to be the fix all but on our demo sled I installed the Power Addiction 13.6 head and the sled has never bogged, hiccup'd, or stuttered SINCE. So who knows?

 

[m8sandman]

take a look at your base gaskets on your powervalves, if you see oily goo you've blown the base gasket. like i posted above did this and the injectors and mine has never bogged once since. i'm leaning more towards the blown base gasket on the powervalve being the cause. they open right around 7200 and with the blown gasket they would have never held any pressure to push the valves open and i'm sure when the computer see's they are not opening it shuts either the ignition or fuel off until it hits 6500 and then enables the system again. mine got progressively worse until it was happening everytime you hit 7200. i'm sure that was the gasket leaking more and more until it just could not hold any pressure at all. in the pic you can see it has "pushed" the gasket out of its seated position...