ECU Issues
I have a 08 M1000 SP, I just purchased after 15 years riding Polaris, still own a 900 RMK that I would like to drive off a cliff, bad support and engineering on poo's part. I drove up to our cabin @ 1000-2200 the temp was @ +10F to +5F my first ride and it never ran on both cylinders for 45-50 miles mag side plugs drenched. The next day I drove back to the cat shop altitude 450 and we looked it over and didn't find much, it was around 16F to 18F and it seem to run on two cylinders. I went back to the cabin and it had dropped temp again around 8F to 4F the sled again was flooding the mag side would not run.
After the weekend I brought the sled back to the dealer and we tested the fuel pressure and found it towards the high end 45.5 psi. We installed a adjustable fuel regulator and dropped the fuel pressure to 42.9-42.8psi. I took the sled for a rip and it ran good. Now the test was to bring it back to the cabin and try it out at a higher elevation the temp was around 10F and altitude the same as above 1000-2200 ran great for three days then the temp dropped below 5f to -2f sled ran on one cylinder again mag side fouled.
Brought into dealer and he has a twin to mine his was doing the same thing at cold temps. Cat was notified and scheduled a trip to Alaska to do some testing on our sleds, since they said they didn't here of these issues in the 48's they showed up on the 14th and have been testing @ close to sea level and 3500', I am @ work on the north slope right now so I have heard just a little bit. My sled was hooked up with test equipment and ran at the above altitudes but the cold snap is gone, needless to say the found them to be rich. I was also told the only other place this problem has been noticed was Japan!! just notified in the last couple of day's on that one. My dealer is installing a O2 sensor on his sled and they are going out today and do some more testing. Another thing that has not been mentioned is the different kinds of refining of gasoline, here in AK we have a lot more light ends in our fuel (butanes, hexanes etc) in the states not as much light ends are found and in some places ethanol is blended. I would think this is a important thing when building fuel curves in the ECU?? I am new to the fuel inj thing, but from what I have seen is that there are four main things the ECU is looking at TPS, air temp, exhaust temp, and barometric pressure to adjust how long the fuel injectors pulse. So if the 87 octane in AK is burning @ a higher egt then the 87 in the 48's this would explain the ecu pulsing the injectors to long at low to mid and flooding the cylinders and along with air temp and fuel pressure it was magnified even further, that’s why when we dropped the fuel pressure it ran better, but when the air temp dropped to around 5 and below it fell back on its face. I am just thinking out loud here, so if I have got off track I do not mind constructive criticism, just trying to put the puzzle together and it looks like you guy's in the 48's are having some similar problems. I have to give it to my dealer and to cat, never received this kind of service with Polarass.
a few seconds after I've shut her down at times.
