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Author Message   Midnightrider Posted on Saturday, April 25, 2009 - 06:32 pm:        Spark-skip mode after 30 minutes of 75mph today (93-ish temp) Stopped cooled it off for 10 minutes, same thing happens again 20 minutes later. Bad fan or bad sensor?   Teeps Posted on Saturday, April 25, 2009 - 08:32 pm:        There is a fan test in ecm spy. The head temp sensor is a different matter. If it's not setting a code; without an independent head temperature reading there is really no way to be sure. Either part is difficult and expensive to replace.   Barker Posted on Saturday, April 25, 2009 - 08:36 pm:        Damhik, a bad fan should give u a 36 trouble code but I think skip spark mode comes from the head temp sensor out of range. Irrc head temp is a 14. Getting any check engine lites, got any codes?   Midnightrider Posted on Sunday, April 26, 2009 - 08:21 am:        Can't remember the DIY engine code reader. I'll do a search I just don't think its the fan - as there is plenty of air moving when I'm doing 75 Once I rode it when the first fan absolutely died. High speed was no problem, didn't get the spark skip until I got into stop and go   Gamdh Posted on Sunday, April 26, 2009 - 08:28 am:        Try here for the codes and the DIY reader http://www.badweatherbikers.com/buell/messages/327 77/64701.html   Midnightrider Posted on Sunday, April 26, 2009 - 08:48 am:        thanks says fan (36). I'll get a fan and replace it - just doesn't make sense to me that a bad fan would make it go spark/skip at highway speeds   Teeps Posted on Sunday, April 26, 2009 - 10:38 am:        Midnightrider Posted on Sunday, April 26, 2009 just doesn't make sense to me that a bad fan would make it go spark/skip at highway speeds The fan blades must turn, either by the motor or windmilling, otherwise they are a giant restriction.   Midnightrider Posted on Sunday, April 26, 2009 - 08:38 pm:        teeps - I've got a drummer plus I usually wear earplugs. I have no idea if the3 fan was running at highway speeds. I want to say it was running when I stopped and shut down - but all I really know is that I heard the fan motor running. I have run a homemade heat shield for years so I guess I'll have to pull it and see if the blades spin freely or if they are jammed   Froggy Posted on Monday, April 27, 2009 - 03:47 pm:        quote: just doesn't make sense to me that a bad fan would make it go spark/skip at highway speeds I think the lack of airflow causing the rear jug to overheat, which then causes the bike to do a skip spark, would cause your issue.   Mnrider Posted on Monday, April 27, 2009 - 04:06 pm:        My fan runs on the hwy.at times if i'm going with the wind.

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