Catalyst 858 Mid-Range Misfire

[Snagg]

I'm getting a low to mid-range misfire. It's not a bog but a definite misfire. Only been on the sled 4 times due to dismal snow conditions. First ride it ran flawless then the second time out I noticed it happening slightly. Third ride it stated out minimal then became constant. Cruising at 5500 to 6000 RPM is where it is worst. Hammer the throttle and it pulls through it and hits peak RPM no problem. Idles fine as well. After the third ride I went straight to my dealer. He had it for several days. Checked out everything and ran it in the shop but couldn't replicate the issue. They suspected the throttle safety switch which they claim is very twitchy on these. They showed me where to unplug it to eliminate that as a possible cause and sent it home with me. Just took it out again and still does the same thing. This time I brought my stock muffler (was running an HPS) and also swapped that off to make sure it wasn't doing some weird stuff. Only other changes I've made are clutching with a Speedwerx kit and billet cover. Can't see how any of that could cause the issue so haven't reverted it back to stock yet and the dealer isn't concerned about it either. Ran it on my stand at home and runs perfectly but of course it's not under a load.
I just dropped it back off at the dealer this morning and they'll look it over once again. He basically said if they can't figure it out to take it out and run it till it pops a code or I guess blows up. Doesn't instill a lot of confidence. Wracking my brain thinking about what it could be....maybe TPS or stator? TPS might cause an issue in a particular band like that maybe. Any ideas out there?

 

[go-on-two]

Any chance your running a lightweight Lithium battery?

 

[Old & slow]

Do you have the reflash? Also spark plug caps have been an issue

 

[Snagg]

Any chance your running a lightweight Lithium battery?

No electric start on mine.

 

[Snagg]

Do you have the reflash? Also spark plug caps have been an issue

Had the reflash done before my first ride. I actually put new caps on yesterday (The Polaris ones which actually look almost identical) after I ran it on the stand. The bummer is we always have snow here in town (Anchroage, AK) and this year we are down to a skiff in the yard. Usually, I'd run it up and down the street to give it a realistic test. Now I have to load it up and drive 60 miles to test anything out.

 

[Snagg]

This all makes me remember my F150 that I had that would start to misfire under load. To make it pop a code you had to drive uphill and get it misfiring consistently then finally it would do it. The tech at the dealership indicated it might be a similar situation. Coils just don't make a lot of sense to me though since it's doing this at partial throttle under relatively light load...flat across the parking lot. You'd think it would be progressively worse the more throttle/load you put on it which is what's so puzzling to me.

 

[arcticridr]

Any chance your running a lightweight Lithium battery?

So what's the supposed deal with LIPO batteries???? Just put one in my 858 Friday rode 65 miles Saturday ran like a striped azz ape !!! and it almost starts just by thinking you are pressing the button way better than with the OE battery!!

 

[go-on-two]

So what's the supposed deal with LIPO batteries???? Just put one in my 858 Friday rode 65 miles Saturday ran like a striped azz ape !!! and it almost starts just by thinking you are pressing the button way better than with the OE battery!!

Just qurious is all, i'm trying to eliminate possible reasons why my sled is doing the same thing as Snaggs, mine misfires and runs very poorly from 6000-6800rpm, then goes into code #1342 has happened a lot...running the best fuel in our area of shuswap BC.

 

[go-on-two]

I tried running with my TSS unplugged and still had the misfiring and code #1324, which is knock sensor. So what gives, it does it at most elevations as well, does seem worse the lower i go.

 

[go-on-two]

I'm getting a low to mid-range misfire. It's not a bog but a definite misfire. Only been on the sled 4 times due to dismal snow conditions. First ride it ran flawless then the second time out I noticed it happening slightly. Third ride it stated out minimal then became constant. Cruising at 5500 to 6000 RPM is where it is worst. Hammer the throttle and it pulls through it and hits peak RPM no problem. Idles fine as well. After the third ride I went straight to my dealer. He had it for several days. Checked out everything and ran it in the shop but couldn't replicate the issue. They suspected the throttle safety switch which they claim is very twitchy on these. They showed me where to unplug it to eliminate that as a possible cause and sent it home with me. Just took it out again and still does the same thing. This time I brought my stock muffler (was running an HPS) and also swapped that off to make sure it wasn't doing some weird stuff. Only other changes I've made are clutching with a Speedwerx kit and billet cover. Can't see how any of that could cause the issue so haven't reverted it back to stock yet and the dealer isn't concerned about it either. Ran it on my stand at home and runs perfectly but of course it's not under a load.
I just dropped it back off at the dealer this morning and they'll look it over once again. He basically said if they can't figure it out to take it out and run it till it pops a code or I guess blows up. Doesn't instill a lot of confidence. Wracking my brain thinking about what it could be....maybe TPS or stator? TPS might cause an issue in a particular band like that maybe. Any ideas out there?

I have the same issue, my dealer is going to change the voltage regulator?

 

[Mafesto]

What is your exhaust temp when this is happening? Low/mid throttle without varying throttle position under low load can create a lean condition.