'07 Idle Issues

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Phyllis Newman

New member
I agree with Scorpion07 that you may be onto something. This crossed my mind when I sprayed some WD-40 into the IAC orifice recently (before changing the IAC motor) and out dripped some dark goop. You would think the oil would lubricate the IAC plunger and make it work better, but maybe this isn't the case and it accumulates and thickens in time.

I have the SE breather, presumably the same as yours. You could unplug the rubber nozzles that divert the oil into the throttle body, then use some rubber hose to channel it to a hole and fitting in the AC backplate for routing outside the AC area. OTOH I wonder if adding hoses to the interior of the AC might interrupt the airflow and reduce performance. I know that just the shape of the velocity stack as air enters the throttle-body makes a big difference, so it wouldn't surprise me if the presence of objects like hoses might have a downside. The way it's made I don't know how you would re-channel it otherwise.

OTOH, if breather blow-by is the culprit that's causing the IAC motors to give problems over time, we could just resign ourselves to changing it out every few years when the problems first start occurring. It only costs $45 MSRP ($29 at Zanotti's), and with the right tools that will fit in that tight area the IAC motor can be changed out fairly quickly without much ado. If that's all that's required I will just leave it alone and plan on this as a regular maintenance item like the manifold seals were for my old Evo.
 
That's the idea of the breather nozzles inside the SEAC, which is to stop the puking. It does stop it, but I wonder if it's at a price. Your '06 may use the same IAC motor as well as the ame TB and AC setup, but I don't recall hearing about IAC problems with '06s or any other models. A friend has an '06 RG and he's had no idling problems (yet). I wonder when the IAC was first introduced and if earlier models use the same part number. The '07 is 27658-06, which means that part was introduced in '06. It might've also been an '06 Dyna part number since they started using the O2 sensors, six-speed tranny, etc. before the touring bikes had them. If you have a parts book for your '06, what is the part number for the IAC motor?

OTOH maybe the '07s had a batch of bad motors and the newer ones will last longer. That's the optimist in me, but another voice is telling me this isn't going to happen.
 
I wonder, since this problem does not seem to exist on all 07's, that the SE AC may be the common denominator? Is it possible that it directs the oil spray straight into the IAC orifice when under vacuum?
I also have the SE AC setup on my bike, and the idle problems tend to manifest itself after high speed riding. Presumably when crank case pressures are at their highest, and therefore dumping more oil into the intake.
Just a little more food for thought....
 
Hello: No I dont have parts book . A friend of mine just by and he has a 06 fatboy stock other than the SE air cleaner, has no idle problem. The only difference is 88" opposed to 97" ? He runs the same speeds as I do asked if he had looked at his throttle body latley and yes it was clean . As soon as I figure out the best way to go Ill order one and try it . Aftermarket has different breathers setups- denniskirk.com , jpcycles.com . Ill see if I can find the p\n for 06 IAC.
 
The nozzles on mine are at about 10 and 2 o'clock (see photo), while the IAC port is at 12 o'clock. As the air is channeled into the throttle body you'd think it would tend to follow a straight path, but maybe not. I don't see how the oil could move up that quickly to enter the IAC port, which is only an inch or so from those points, although it obviously does since I definitely saw some dark gunk drip out when I sprayed some brake cleaner and WD-40 in the port. Obviously it's coming from somewhere, and the breather is about the only place it could come from.





My problem was mostly high-idle when cold, which makes me think the IAC motor was sticking. It would only rarely have a rough low-idle, but never actually died on me, and that was always after starting when not completely cold, like after sitting for an hour or less. I don't recall it doing that while riding, like idling after stopping for a red light.
 
I'm still getting the feeling this is related to oil spray and the IAC.
Another question has to be asked though - why doesn't it effect the air sensor(?) below and to the left of the IAC? I would imagine that sensor would be VERY sensitive to any oil droplets? Which may explain your high idle at start up???
It's pretty lame that we have to contemplate this crap when I'm positive Harley engineers know the answer!
 
Interesting thread and after reading I mayt be in a different situation. I am using TTS for tuning ECM.

I am no expert but my expierence tells me programs for an ECM or high speed packaging equipment whichI work with the programs either work or they don't. IE if this is an on/off intermittent problem it probably is not program problem. Just my .02. I would be guessing IAC bad or dirty after checking volts at idle setting and TPS volts like the bulletin.

I have had a high idle once in a while nothing as high as I have read here but with the TTS program yiou have to stop for the idle speed setting to really reset or home posistion. If mine idles above normal setting if I just stop and let idle it will settle down to nromal speed and probem is gone. This does not happen often so I have not really worried about it. I have checked Idle volts on TPS.

Will be following to see what you find and is the fix.

Seems some of you are having more of an issue then I have had.
 
First off I keep calling that 07 dyna a 97" and yes it is 96" . If the blow-by is taken out the IAC , I would think it is coating the IAT sensor as well as holden back the throttle body blades. The map sensor and the TP sensor is in there to. Im going to see if I can get to the IAT sensor and see what it looks like !
 
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