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FJR Motorcycle Forums
Technical & Mechanical Problems
Misfire at steady cruise
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<blockquote data-quote="Smerkal" data-source="post: 990012" data-attributes="member: 29283"><p>Just got my first FJR. 2006 AE model. I've wrenched on everything from cars to airplanes to truck and boats, but this is my first fuel injected bike. it seems pretty straight forward as far as fuel injection goes.</p><p></p><p>I've noticed that when idling, running at steady RPM (any) in neutral or running at steady cruise (light load, any speed) the exhaust has a constant misfire/burble sound. At times I think I hear a ping as well but can't get it to do it consistently. When idling, it sometimes sounds like the ignition misfires against the compression and you get a hard miss. I've done the usual:</p><p></p><p>TB Sync</p><p></p><p>Plugs</p><p></p><p>Checked for vacuum leaks</p><p></p><p>Messed with CO settings</p><p></p><p>Fresh fuel</p><p></p><p>Injector cleaner</p><p></p><p>No codes</p><p></p><p>Ground spiders are clean and tight, no damage. Ground voltage drops are acceptable</p><p></p><p>Main harness connectors are clean and tight</p><p></p><p>The bike is stock other than a horn and add on lights. It came with StainTune exhaust but I removed that to be sure it wasn't the source of the issue. It runs strong under acceleration all the way to red line, but as soon as you put it under light load it stumbles around.</p><p></p><p>I'm planning to get an oscilloscope from a friend this afternoon and look at the crank sensor, injectors, TPS, etc to see what I can ascertain. Any suggestions?</p></blockquote><p></p>
[QUOTE="Smerkal, post: 990012, member: 29283"] Just got my first FJR. 2006 AE model. I've wrenched on everything from cars to airplanes to truck and boats, but this is my first fuel injected bike. it seems pretty straight forward as far as fuel injection goes. I've noticed that when idling, running at steady RPM (any) in neutral or running at steady cruise (light load, any speed) the exhaust has a constant misfire/burble sound. At times I think I hear a ping as well but can't get it to do it consistently. When idling, it sometimes sounds like the ignition misfires against the compression and you get a hard miss. I've done the usual: TB Sync Plugs Checked for vacuum leaks Messed with CO settings Fresh fuel Injector cleaner No codes Ground spiders are clean and tight, no damage. Ground voltage drops are acceptable Main harness connectors are clean and tight The bike is stock other than a horn and add on lights. It came with StainTune exhaust but I removed that to be sure it wasn't the source of the issue. It runs strong under acceleration all the way to red line, but as soon as you put it under light load it stumbles around. I'm planning to get an oscilloscope from a friend this afternoon and look at the crank sensor, injectors, TPS, etc to see what I can ascertain. Any suggestions? [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Misfire at steady cruise
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