Catalyst 858 Mid-Range Misfire

[arcticridr]

I believe speedwerx is claiming no timer with their pipe

I really like the quality of the Jaws products with real no BS gains and weight savings not that speedwerx fidges numbers just have had good luck with my Jaws exhausts on several sleds .I really like my Ceramic BMP on my hardcore cept it's almost to rat nasty even for me who like em loud !! Can't imagine that can on a stroker 858!!

 

[tenacious84]

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?

change the clutching back to the factory settings and see if the condition stays the same, fixes it, or moves to a different RPM range. this would be appropriate feedback any good dealer should be recommending. and good on you for being forthcoming in sharing that it wasn't factory components. gotta remember these vehicles are calibrated for 6K-8k feet, driving it at low elevation with aftermarket clutching could be putting it into a bad spot of the fuel calibration.

 

[600max]

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.

I am experiencing the same issue. Mine is stock exhaust and clutching. First trip out West it ran fine no issues, had the original engine calibration. Second trip out West I had the problem immediately, just as described by Snagg. I had the ECU calibration updated prior to my second trip, that is the only thing that changed. In addition to the misfire in the low to mid range it seems to vibrate more than I remember. We had 2 other 858’s in the group, both with the updated calibration and they did not have the issue, they both ran great from top to bottom. They both had Jaws cans and Speed Works clutch kits. Don’t have many hours on mine yet, maybe just a break in thing?

 

[Old & slow]

It happens going up the main groomed trail start of day and coming back to parking area, right from the bottom 1300' to at least 5000' where the riding starts to come alive. Definitly seems like detonation or lean running at about 1/4-1/2 throttle type thing. But to stay out of that rpm range you either have to go very slow to stay under 6000rpm or go like hell and have close calls with other sleds on the trail.

Have you tried octane boost or different fuel? It sure sounds like a detonation issue to me. It would be nice to try different fuel who knows maybe some one filled the premium tank with regular?

 

[go-on-two]

Have you tried octane boost or different fuel? It sure sounds like a detonation issue to me. It would be nice to try different fuel who knows maybe some one filled the premium tank with regular?

Yes i have tried premium marked fuel, syphoned that out then tried premium 91 and still did the same, syphoned that out used Chevron 94 the last couple rides with the same results. Different gas stations as well just to be able to eliminate that as a factor!!

 

[Old & slow]

Did you try a different knock sensor?

 

[tswan]

First 100-150 miles from around 6200-6400 rpm I would have a dead spot when sled was cold going up the trail it would go away when it warmed up. Have not had it since around that 150 miles. 600+ miles now and no issues.

 

[go-on-two]

Have not replaced the Knock sensor, it is definitely working cause its mis firing and going into code #1324 quite often. don't think the sensor can cause it to detonate, its designed to sense it and protect the engine by going into limp mode. Seems like it must be rediculously lean in the 6000-6800 rpm ish range, so much its nearly unrideable on certain trails where you have to stay in that rpm range.

 

[zl5600]

Have not replaced the Knock sensor, it is definitely working cause its mis firing and going into code #1324 quite often. don't think the sensor can cause it to detonate, its designed to sense it and protect the engine by going into limp mode. Seems like it must be rediculously lean in the 6000-6800 rpm ish range, so much its nearly unrideable on certain trails where you have to stay in that rpm range.

Years ago, on the 800 motors, if they were not torqued properly, they would do this. Check with your dealer.

 

[tenacious84]

Years ago, on the 800 motors, if they were not torqued properly, they would do this. Check with your dealer.

what do you mean not torqued properly?

 

[arcticridr]

I know you said you have tried several different fuels from different stations and "siphoned" it out when changing but could their be water in the bottom of the tank you are missing ??? I have a couple of "tank snakes" made by Napa filters (wix) that I put in a couple times a year overnight , they absorb all the water outta the fuel (turn blue) .When you are done with them hang them in the sun and they dry and are good to go again be surprised how much water I get a couple times a year !!! Don't believe wix has them anymore but New Pig (makers of pig mat absorbent mats) sell them might be worth a shot if all else fails cheap investment and good fuel maintenance practice !! FYI

I think by torqued he means loaded my guess !?

 

[Old & slow]

Have not replaced the Knock sensor, it is definitely working cause its mis firing and going into code #1324 quite often. don't think the sensor can cause it to detonate, its designed to sense it and protect the engine by going into limp mode. Seems like it must be rediculously lean in the 6000-6800 rpm ish range, so much its nearly unrideable on certain trails where you have to stay in that rpm range.

I was thinking the sensor was out of parameter maybe to sensitive and registering a knock when there wasn't one. It wont cause detonation but might make the ecm think there is. Remove the knock sensor inspect it for cracks etc and reinstall torqued to spec. Another thing to try would be av gas or race fuel just add some to your 91 and see if that changes anything. You could measure the squish and see if that is comparable to another one. Just spit balling ideas. Good luck and please update if you figure it out.

 

[zl5600]

what do you mean not torqued properly?

To the head. There was a specific spec. To how much torque is required.

 

[Snagg]

change the clutching back to the factory settings and see if the condition stays the same, fixes it, or moves to a different RPM range. this would be appropriate feedback any good dealer should be recommending. and good on you for being forthcoming in sharing that it wasn't factory components. gotta remember these vehicles are calibrated for 6K-8k feet, driving it at low elevation with aftermarket clutching could be putting it into a bad spot of the fuel calibration.

Did just that the other day....no issues. Ran good the whole time.
Someone else said they experienced a similar issue after going aftermarket on their clutching. They resolved it by moving weight to the heel. My weights use the set screws and already had the largest one in the heel so couldn't do that in my situation. Funny thing about all this is I had promised myself to leave it stock this season for this very reason....didn't wanna end up spending too much time tweaking and messing with stuff. Just can't help myself though.

 

[tenacious84]

Did just that the other day....no issues. Ran good the whole time.
Someone else said they experienced a similar issue after going aftermarket on their clutching. They resolved it by moving weight to the heel. My weights use the set screws and already had the largest one in the heel so couldn't do that in my situation. Funny thing about all this is I had promised myself to leave it stock this season for this very reason....didn't wanna end up spending too much time tweaking and messing with stuff. Just can't help myself though.

I'm happy to hear it helped

 

[Snagg]

I'm happy to hear it helped

Now if I could just get it to not overheat!