Intermittent Check Engine Light

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Oct 26, 2018 | 10:02 PM

#11

Seasoned HDF Member

Joined: Mar 2012

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From: Centennial, CO

Quote:

Originally Posted by fxdx1985

What specifically am I checking on them and what was your issue?

I changed wires to an aftermarket brand that was supposedly compatible with the ion sensing system. I started getting exactly what you’re describing. Changed them to the SE wires and the issue went away.

Oct 28, 2018 | 02:07 PM

#12

fxdx1985

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Road Master

Joined: Dec 2016

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Quote:

Originally Posted by F86

I've named the phenomenon "Cam Apnea." Sort of like sleep apnea, except instead of your breathing stopping for a moment, the front cam would stop turning for a fraction of a moment, then spring forward to where it should be (I mean a REALLY brief interruption). Once I changed the cam chain, everything came back to normal and the light never reappeared. I'm not exactly sure of everything that can trigger that light on a carbed bike, but my theory was the Cam Position Sensor. I don't know why it didn't throw the light at lower speeds, but maybe the issue didn't fully present itself until engine speeds and/or temp was above a certain point!

This does sound very spot on. I’ll have a look, thanks!