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  #1  
Old 15th July 2007
DG_Sportster's Avatar
DG_Sportster DG_Sportster is offline
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Default WTF? Why is my IAC cycling when the bike is off?

Here's a strange one.....

If your familiar with injected Sportys, you know that when you cut the key or kill switch off, you get a gurgling sound from behind the air cleaner. No biggie, i assume this is normal.

Now imagine my surprise when i came out yesterday to install my shocks ( key still in the house ) a full 48 hours after it had last ran, and the bike is sitting there making this same noise every 20 seconds or so! After a few minutes it quit, but i decided to investigate.....

...and that's when my red-flag-o-mater went up! This noise is, in fact, the Idle Air Control motor cycling from full open, to close, to full open again when the engine is killed. As i said, the noise occurring when killing the engine is undoubtedly normal.
What doesn't seem "normal" is having this event happen with the bike off, and not having been touched for 2 days! No, the ignition switch wasn't in "ACC" either.

I can't see why Harley would program the HDSFI to do such a thing, yet at the same time, i can't see anything but a bad ECM causing such a thing, yet the bike starts and runs just fine.

Is my bike possessed?

Calling the dealer resulted in ZERO info....they had never heard of something like this ( go figure ).

If someone out there has the injection service manual, you sure would ease my mind if you told me this was normal behavior for H-D injection.

Much thanks for any info someone might have.
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  #2  
Old 15th July 2007
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LilHog59 LilHog59 is offline
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Whenever I shut my bike off, I always hit the kill switch first and then the ignition key second. I was told this when I purchased the bike by the mechanic delivering and explaining the controls and operations. I have never heard of the sound that you speak of when I shut the bike off, I get no gurgling sound or maybe I just can't hear it. I would take it back to the dealer and get it checked out.
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  #3  
Old 15th July 2007
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Muttley Muttley is offline
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Can't state chapter and verse (without digging the manual up) but I saw a statement to the effect that you should ALWAYS shut the engine down using the run/stop switch before turning the key off.
And no, I can't recall hearing any gurgle.
That said, I can't imagine that changing this order would cause the thing to cycle on and on.
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  #4  
Old 15th July 2007
Krayven Sumhead Krayven Sumhead is offline
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Weird things start happening if the 'kill' switch isn't used.
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  #5  
Old 16th July 2007
Facade Facade is offline
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I never mess with the kill switch, ever. Never needed to on the Buell, the old sporty, or the procession of other bikes I've had in the last 25 years. It is for when you crash, not daily use.

That "warning" was also in the carb version manual.

I just assumed it was to do with safety, stopping the engine whilst you still have your hands on the bars.

I can't believe that HD's wiring is so dodgy that you need to switch it off twice!
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  #6  
Old 16th July 2007
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i usually always use the kill switch, but have used the key instead before also
and ive never heard a gurgling sound, and theres no reason to have it still breathing when its dead (ignition off)
yes your bikes possessed, i,ll perform an exorcism soon, HD charges for this but mines free.
you dont have Gremlins you have Demons!
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  #7  
Old 16th July 2007
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Quote:
Originally Posted by LilHog59 View Post
Whenever I shut my bike off, I always hit the kill switch first and then the ignition key second. I was told this when I purchased the bike by the mechanic delivering and explaining the controls and operations. I have never heard of the sound that you speak of when I shut the bike off, I get no gurgling sound or maybe I just can't hear it. I would take it back to the dealer and get it checked out.
Ditto, The kill switch on the injected sporty's is really like the power switch for the fuel pump, it says right in the owners manual to first turn on the key then turn on the kill switch. Same goes when shutting down, first the kill switch, then the key. Why Harley made it this way is beyond me, but a lot of things they do don't make any sense to me. I've never heard a gurgling sound either.
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  #8  
Old 16th July 2007
doxbike doxbike is offline
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Quote:
Originally Posted by bell883c View Post
Ditto, The kill switch on the injected sporty's is really like the power switch for the fuel pump, it says right in the owners manual to first turn on the key then turn on the kill switch. Same goes when shutting down, first the kill switch, then the key. Why Harley made it this way is beyond me, but a lot of things they do don't make any sense to me. I've never heard a gurgling sound either.
ditto here
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  #9  
Old 16th July 2007
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DG_Sportster DG_Sportster is offline
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Perhaps it would be better to describe it as a sound similar to an injector firing. It's very faint....
I want to make it clear that it's not the noise when shutting the key off that concerns me....it's always done that once. It's the fact that it seems to do this repeatedly when it takes a notion...with both switches off!

An update of sorts....

On the suggestions above, i went out to the bike yesterday ( which had not been fired for 24 hours at that point ) and, with the ignition key not even in the bike ( i checked to be sure it was in the off position ), i flipped the kill switch on the bars to the "off" position. Imagine my delight when this event seem to set off another round of IAC cycling. I tried everything....starting the bike, and THEN killing it with the run switch then cutting the ignition off....rocking the kill switch back and forth....etc.
This session lasted for approx. 30 minutes, but i might have stopped it myself...

Truth be told, i was timing the whole thing to see how long it lasted, as a nice round number of minutes might indicate this was intentionally programed in by HD, stupid as it would be. Right around the 30 minute mark, i was looking inside the left cover where the fuses are, and I noticed some sort of oxidation looking build-up which my be dried soap from washing it. This lead me to poke and prod, and while tapping on the two relays, the IAC cycling suddenly stopped. As to weather or not this was due to my actions, or that fact that these little episodes last exactly 30 minutes, i can't say for sure.....

Honestly, this is starting to look like an electrical issue...and you know what kind of nightmare those can be, especially for the idiot mechanics at the dealer.

I'll try and duplicate it again today.

Anyone got anymore info?

Much thanks to all.
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  #10  
Old 16th July 2007
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chrishajer chrishajer is offline
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You had me up until "idiot mechanics at the dealer."

Good luck with your problem.

-Chris
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