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FJR Motorcycle Forums
Technical & Mechanical Problems
2011 electrical/ignition problem
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<blockquote data-quote="ionbeam" data-source="post: 883434" data-attributes="member: 277"><p>Do check to be sure that the idle speed is 1,100. When the ECU sees that the motorcycle is decelerating it runs a Deceleration Fuel Cut-Off routine, couple this with low idle and it may be why the engine cuts off. If you are decelerating with the transmission in gear and the clutch engaged (locking the engine to the wheel) the force of the wheel working on the engine will keep the fire lit. A good deal of the reason most cars idle at 600 rpm and motorcycles idle at 1,100 rpm is due to light flywheel weight and lower engine rotational inertia. The motorcycle needs the extra rpm to make up for the lighter flywheel weight (and an engine with hot rod cams).</p><p></p><p>If your warm idle rpm is indeed 1,100 then more work will need to be done. I doubt that it is caused by something like the side stand sensor because the problem only shows up during a specific condition during deceleration. This is key, something in the deceleration profile is triggering the event. If the problem persists even with the idle at 1,100 rpm I wouldn't rule out a software problem with the ECU Decel routine, something that a Power Commander or equivalent may help. It would also be interesting to see what the TPS reads in the diAG mode and where the TB vacuum is at idle.</p></blockquote><p></p>
[QUOTE="ionbeam, post: 883434, member: 277"] Do check to be sure that the idle speed is 1,100. When the ECU sees that the motorcycle is decelerating it runs a Deceleration Fuel Cut-Off routine, couple this with low idle and it may be why the engine cuts off. If you are decelerating with the transmission in gear and the clutch engaged (locking the engine to the wheel) the force of the wheel working on the engine will keep the fire lit. A good deal of the reason most cars idle at 600 rpm and motorcycles idle at 1,100 rpm is due to light flywheel weight and lower engine rotational inertia. The motorcycle needs the extra rpm to make up for the lighter flywheel weight (and an engine with hot rod cams). If your warm idle rpm is indeed 1,100 then more work will need to be done. I doubt that it is caused by something like the side stand sensor because the problem only shows up during a specific condition during deceleration. This is key, something in the deceleration profile is triggering the event. If the problem persists even with the idle at 1,100 rpm I wouldn't rule out a software problem with the ECU Decel routine, something that a Power Commander or equivalent may help. It would also be interesting to see what the TPS reads in the diAG mode and where the TB vacuum is at idle. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
2011 electrical/ignition problem
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