eric_mil

UPDATE: Well, after getting the stock tube and a new IAT sensor, the issue still isn't fixed. I'm not sure what I did to get the bike running normally for a few minutes but it seemed like heating up the IAT sensor (telling the engine the air was warmer) made it run normally. Maybe it was just a coincidence. This is where I'm at.. So far I've replaced the fuel pump and fuel pressure regulator, in line fuel filter, spark plugs, fuel injector orings, intake and exhaust manifold gaskets, vacuum cap on the throttle body, O2 sensor, IAT sensor, and I already reset the TPS through my limited use ECM Spy. I'm replacing the TPS next to see what that does since I see other Buell owners with similar issues with a bad TPS. Could also be the engine temp sensor in the cylinder head or maybe a bad injector but both injectors activate normally through ECM Spy. I will update this post again when I figure it out.

The short ram intake tube that was installed on my bike was made for the carbureted engines which didn't have IAT sensors. If you run into this problem, here's the cheaper alternative I was talking about with the stock air intake tube. http://www.badweatherbikers.com/cgibin/discus/discus.cgi?pg=next&topic=47623&page=455522

Thanks to Disclaimer's help almost 6 years later, I was able to figure out the issue with my X1! For those of you that may find this post looking for an answer like I was, try this repair first. Here is what I found.. I just recently got the bike and this just started happening when the weather got colder here in TX. My X1 has an aftermarket K&N filter with short ram air intake tube. The issue with the tube though is it doesn't have a hole for the Intake Air Temperature (IAT) sensor, so the previous owner zip tied the IAT to the frame. And since there is no Mass Airflow sensor, this input is very important that it's accurate. With it zip tied to the frame, it was seeing ambient temp which is much lower than intake temp when it's freezing outside, especially at idle. So, I put a cloth over the sensor and held it in my hand to warm it up and after about a minute the ECM started to adjust everything back to normal and my bike ran great! As soon as I took my hand off and it started to change temperature again, it started to run crappy again but still much better than it was IF it even stayed running. It may be that the sensor is faulty too like in Disclaimer's case, so I am buying the stock intake tube with the bung for the IAT and using the K&N filter with a new IAT sensor. Also, if you look at the Forcewinder intake kit, it still utilizes the IAT sensor in the actual intake, so they knew what they were doing but it's $350 so I will make my own version for now.

Hey Guy, I see this post is from 5-6 years ago but I'm having the same exact symptoms with my Buell X1 now. I was wondering if you ever figured out what the issue was. I have been jumping through hoops trying to figure this one out and any help would be greatly appreciated. My email is ebm5046@gmail.com. Thanks, Eric