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FJR Motorcycle Forums
Technical & Mechanical Problems
Gen II - Strange Cold Start Issue
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<blockquote data-quote="Denver_FJR" data-source="post: 1217116" data-attributes="member: 19217"><p>This ^^^.... and I pulled my hair out too!</p><p></p><p>While not frequently reported, a few of us have been caught with marginal batteries and seen these symptoms. Bike appears to start fine and battery passes static voltage tests but low RPM throttle response and idle is erratic. My theory is with a marginal battery, during startup the voltage drops to a level that somehow corrupts something in the ECU. I'm guessing in your case the cold weather at Big Bend may have reduced battery capacity enough to trigger it. After you warmed up the bike and charged the battery a bit, then shut off ignition (clearing ECU) and restarted, the battery capacity was now enough to prevent problem.</p><p></p><p>You could check the sensors using the dash DIAG utility to confirm it's not a sensor gone bad, but they're pretty reliable (other than the TPS which there was a bad batch). If it's not happening now, wouldn't worry too much about it but as the battery ages I expect it will become more frequent.</p></blockquote><p></p>
[QUOTE="Denver_FJR, post: 1217116, member: 19217"] This ^^^.... and I pulled my hair out too! While not frequently reported, a few of us have been caught with marginal batteries and seen these symptoms. Bike appears to start fine and battery passes static voltage tests but low RPM throttle response and idle is erratic. My theory is with a marginal battery, during startup the voltage drops to a level that somehow corrupts something in the ECU. I'm guessing in your case the cold weather at Big Bend may have reduced battery capacity enough to trigger it. After you warmed up the bike and charged the battery a bit, then shut off ignition (clearing ECU) and restarted, the battery capacity was now enough to prevent problem. You could check the sensors using the dash DIAG utility to confirm it's not a sensor gone bad, but they're pretty reliable (other than the TPS which there was a bad batch). If it's not happening now, wouldn't worry too much about it but as the battery ages I expect it will become more frequent. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Gen II - Strange Cold Start Issue
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