MoldTheClay
Well-known member
Some background: Warning, lots of information.
I was previously having a strange issue when my engine was very cold during the winter where the idle would fluctuate while the engine was cold. This problem would go away after the engine warmed up usually, so I didn't pay it much mind.
Some weeks later I heard a strange twitchy buzzing noise when my power was on but the ignition had not yet been pressed and the bike started. I pulled everything off until I could see the intakes and saw a twitch in my sub throttle body butterflies. I had no idea if this continued while I had the engine running or not, as I didn't want to start the engine with the air box off and potentially inhale debris into my engine. At that moment it seemed harmless, so I left it at that. Bike ran fine enough so didn't bother with it much.
Well NOW the strange idling is happening while the engine is hot on a warm/hot day like we've been having. Not sure if it will go away again when the weather cools but this made me look into it a bit more. I pulled off my left fairing to look at where my throttle cables connect to my throttle body. That servo twitch also controls a small nub that nudges the throttle open a little bit. The purpose of that little arm (I'm guessing) is to open the throttle enough to keep the bike warm on command from the ECU until it is at proper operating temp. It looks like there is either noise in the wires causing that signal to fire erratically, a failed sensor causing inconsistent information and the ECU is trying to correct for that, or angry spirits are haunting my throttle body. Honestly, I'm at a loss.
Any hints where I might look to solve this? If I hold the throttle down hard enough in the closed position the bike idles beautifully and holds proper idle. The fluctuation is 100% caused by a signal causing that little nub to bump the bottom end of the throttle around when I am idling.
when I am at operating rpm everything seems to run totally fine however. No effect with my riding whatsoever. That strange signal has me worried though, especially since it now also occurs when the bike is hot.
I was previously having a strange issue when my engine was very cold during the winter where the idle would fluctuate while the engine was cold. This problem would go away after the engine warmed up usually, so I didn't pay it much mind.
Some weeks later I heard a strange twitchy buzzing noise when my power was on but the ignition had not yet been pressed and the bike started. I pulled everything off until I could see the intakes and saw a twitch in my sub throttle body butterflies. I had no idea if this continued while I had the engine running or not, as I didn't want to start the engine with the air box off and potentially inhale debris into my engine. At that moment it seemed harmless, so I left it at that. Bike ran fine enough so didn't bother with it much.
Well NOW the strange idling is happening while the engine is hot on a warm/hot day like we've been having. Not sure if it will go away again when the weather cools but this made me look into it a bit more. I pulled off my left fairing to look at where my throttle cables connect to my throttle body. That servo twitch also controls a small nub that nudges the throttle open a little bit. The purpose of that little arm (I'm guessing) is to open the throttle enough to keep the bike warm on command from the ECU until it is at proper operating temp. It looks like there is either noise in the wires causing that signal to fire erratically, a failed sensor causing inconsistent information and the ECU is trying to correct for that, or angry spirits are haunting my throttle body. Honestly, I'm at a loss.
Any hints where I might look to solve this? If I hold the throttle down hard enough in the closed position the bike idles beautifully and holds proper idle. The fluctuation is 100% caused by a signal causing that little nub to bump the bottom end of the throttle around when I am idling.
when I am at operating rpm everything seems to run totally fine however. No effect with my riding whatsoever. That strange signal has me worried though, especially since it now also occurs when the bike is hot.
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