Over-fueling / Fouled Plugs / Stock Tuning - HCS Snowmobile Forums

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Old 11-27-2011, 12:24 AM   #1 (permalink)
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Default Over-fueling / Fouled Plugs / Stock Tuning

I did the first big real ride of the season on friday, as did everyone else in southcentral AK with the weekend opening and right off the getgo the sled was firing on one cylinder. I swapped the plugs and then it ran fine - 10 minutes later - firing on one cylinder again. One of the local sled shop owners was there and he recommended that I replace the stock plug caps with NGK plug caps as they seat tighter on the plug and they make better contact with the plug wires. I met him at the parking lot to get the parts and I shaved some insulation down to expose the wire a bit better and put on the new plug cap. after several minutes - same deal - misfiring. I only replaced the clutch side plug cap but swapped new plugs for both sides when needed because it seemed to be the side that was misfiring. Im home now and need some suggestions. Last year my sled did this twice and it was just a matter of throttle cable adjustment and plug changing, it was overfueling - the exhaust was rather black as well this last ride when firing on one cylinder. Im going to inspect the wires/plug caps and install new ones along with finding the right throttle adjustment. Any ideas where that should be?
NOTE: Ive recently been told that it could possibly be caused from the aftermarket exhaust can because when these sleds were built, they were tuned with stock specs and parts (obviously), but most aftermarket manufacturers test and fine tune their parts before bringing it to the market. Does anyone else have an aftermarket exhaust (pipes/cans etc.) with this similar issue?
thoughts - comments - ideas - would be appreciated
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Old 11-27-2011, 08:54 PM   #2 (permalink)
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what color are your fuel injectors? if you look from the exhaust can side of your sled in at your throttle bodys the wires to the injectors are on top of fuel rail they have a wrap of colored tape on them. either yellow, blue, or red. if they are blue or red they should be replaced. new ones will be yellow but ecu will have to be reflashed. some yellow have also failed. polaris will warenty this if there bad. but first do you have a check engine light on?
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Old 11-27-2011, 10:15 PM   #3 (permalink)
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Lol not what I wanted to read for the first ride report
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Old 11-27-2011, 10:22 PM   #4 (permalink)
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Old 11-27-2011, 11:11 PM   #5 (permalink)
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Quote:
Originally Posted by AK907FERK View Post
I did the first big real ride of the season on friday, as did everyone else in southcentral AK with the weekend opening and right off the getgo the sled was firing on one cylinder. I swapped the plugs and then it ran fine - 10 minutes later - firing on one cylinder again. One of the local sled shop owners was there and he recommended that I replace the stock plug caps with NGK plug caps as they seat tighter on the plug and they make better contact with the plug wires. I met him at the parking lot to get the parts and I shaved some insulation down to expose the wire a bit better and put on the new plug cap. after several minutes - same deal - misfiring. I only replaced the clutch side plug cap but swapped new plugs for both sides when needed because it seemed to be the side that was misfiring. Im home now and need some suggestions. Last year my sled did this twice and it was just a matter of throttle cable adjustment and plug changing, it was overfueling - the exhaust was rather black as well this last ride when firing on one cylinder. Im going to inspect the wires/plug caps and install new ones along with finding the right throttle adjustment. Any ideas where that should be?
NOTE: Ive recently been told that it could possibly be caused from the aftermarket exhaust can because when these sleds were built, they were tuned with stock specs and parts (obviously), but most aftermarket manufacturers test and fine tune their parts before bringing it to the market. Does anyone else have an aftermarket exhaust (pipes/cans etc.) with this similar issue?
thoughts - comments - ideas - would be appreciated
Yours is a 11 isn't it? Hopefully my 12s not gonna do that first ride lol
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Old 11-27-2011, 11:27 PM   #6 (permalink)
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Yours is a 11 isn't it? Hopefully my 12s not gonna do that first ride lol
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Old 11-28-2011, 12:21 AM   #7 (permalink)
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2012's have bosch fuel injectors. no problem with them. 2008-2011 use a different supplier i can,t remeber the name. there were some injector failers with a run of them. problem is some 2011 got them and polaris doesn't know how many or the specific sleds. what i under stand with the color coding is they are flow tested and given a color code. yellow flows the least red the most. the ecu has to be programed to these different colors. so you can't just change a red for a yellow injectors without a reflash. that tells me the injectors are all over the place. if you get new injectors they are only yellow now. the other problem is its a mechainical problem not electrical. so it doesn't show up on the digital wrench. if you are having fuel related issues? fouling plugs,stalling,hesitating,stumbling,running rich, lack of performance,etc. i would suspect the injectors. take it to a dealer they have to do a bunch of test to rule out other problems before they replace them. i'am not trying to scare anyone just passing on what i've had happen and know about. from what i've seen its over fueling and not burn downs. i think the injectors are either sticking or flowing fuel when they shouldn't?
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Old 11-28-2011, 03:47 AM   #8 (permalink)
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Quote:
Originally Posted by northstarrick View Post
2012's have bosch fuel injectors. no problem with them. 2008-2011 use a different supplier i can,t remeber the name. there were some injector failers with a run of them. problem is some 2011 got them and polaris doesn't know how many or the specific sleds. what i under stand with the color coding is they are flow tested and given a color code. yellow flows the least red the most. the ecu has to be programed to these different colors. so you can't just change a red for a yellow injectors without a reflash. that tells me the injectors are all over the place. if you get new injectors they are only yellow now. the other problem is its a mechainical problem not electrical. so it doesn't show up on the digital wrench. if you are having fuel related issues? fouling plugs,stalling,hesitating,stumbling,running rich, lack of performance,etc. i would suspect the injectors. take it to a dealer they have to do a bunch of test to rule out other problems before they replace them. i'am not trying to scare anyone just passing on what i've had happen and know about. from what i've seen its over fueling and not burn downs. i think the injectors are either sticking or flowing fuel when they shouldn't?
yea this is basically what the dealer explained to me last year as well but they were able to avoid tinkering with the injectors by adjusting the throttle. i'll take a look tonight.

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Originally Posted by 2010rmk800 View Post
Yours is a 11 isn't it? Hopefully my 12s not gonna do that first ride lol
yes it is. yea hopefully no one else has this issue.
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Old 11-28-2011, 10:43 AM   #9 (permalink)
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What kind of can are you running? I've recently come across a guy whos MBRP can gave him engine issues..
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Old 11-28-2011, 02:31 PM   #10 (permalink)
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Quote:
Originally Posted by northstarrick View Post
2012's have bosch fuel injectors. no problem with them. 2008-2011 use a different supplier i can,t remeber the name. there were some injector failers with a run of them. problem is some 2011 got them and polaris doesn't know how many or the specific sleds. what i under stand with the color coding is they are flow tested and given a color code. yellow flows the least red the most. the ecu has to be programed to these different colors. so you can't just change a red for a yellow injectors without a reflash. that tells me the injectors are all over the place. if you get new injectors they are only yellow now. the other problem is its a mechainical problem not electrical. so it doesn't show up on the digital wrench. if you are having fuel related issues? fouling plugs,stalling,hesitating,stumbling,running rich, lack of performance,etc. i would suspect the injectors. take it to a dealer they have to do a bunch of test to rule out other problems before they replace them. i'am not trying to scare anyone just passing on what i've had happen and know about. from what i've seen its over fueling and not burn downs. i think the injectors are either sticking or flowing fuel when they shouldn't?
Phew.. Lol good to hear for the 2012s
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