Subscribing.

 

bump up.

 

UPDATE: Went to Sturgis with my 07 SG....had intermittent idle issues the whole way there and back. Stuck at high idle, low idle/die out. Both happened at random times

Last week I opened the air cleaner assembly back up.

Took the advice of the guy who told me to clean the IAC oriface, but this time cycle the run/off switch as you spray it out. So I did that.

Oiled both the throttle and idle cables where they enter behind the IAC body as well...just in case they were getting hung up.

For almost a week it ran great. No idle lower than 950...steady there as well. No high idle and the bike ran great.

Took it home for lunch today, and the idle went to 5-600 at a stop light....and wanted to die, but didn't. It's baaaaaack!! DAMNIT!!!!!

Cleaning the IAC must enable a good working mechanism for a tad, but I am clueless now. Bad IAC? I am considering asking my local dealer to just swap out the IAC - becuz I want it done. If I tell them what is wrong and it's intermittency, they are likely to not even try fixing it, or do something random.

I want to love this new bike as much as my old one, but now once again I am just frustrated with it.

NOTE: You can almost tell when the problem is going to happen - when it is going to low idle, because as you decelerate, small backfiring occurs. That does not happen when the idle will be steady at 950 rpm after a complete stop.

I HATE THESE TYPES OF ISSUES

 

Replace the TPS...

 

Where and what is the TPS??

 

Throttle Position Sensor. While looking at the trottle body it is on the left side opposite of the throttle cable assy. It has an elec connector on it and I believe 2) t-15 torx tamper proof screws and cost about $28. About a 15 min job. In the middle of this thread there are some tips and tricks to R&R it.

 

My train of thought on this issue, after dealing with it for 4 years, is this:
First off, I used to be a throttle blipper on decel, to keep the rpm's up for spirited downshifts. I noticed after a particular speed run on the Dragon, that my bike started to drop rpm's at idle, as well as after any high rpm downshifts, like coming off the E-way. So I stopped doing it and started shifting at lower rpm's. Seemed to help.
Next, since I started downshifting at a different rpm on regular downshifts, it also all but eliminated the issue. And when it does happen, I just wait for the oil to remove itself from the sensor and things get back to normal.
I've cleaned my IAC once and it helped for a while, but the low idle still came back. It wasn't until I changed my riding habits that it became less of an issue.
What I think happens, is the downshifting or heavy decel creates less vacuum and because of that, the oil mist which is probably also more concentrated because of crank evacuation, has more time to linger around and affix to the IAC, thus interfering with the sensors ability to do its job. Add the different Venturi flow from the non stock air filter (SE) and the problem seems to get exacerbated. It's a hunch? And I may be off on the too little vacuum (might be too much), but I think this problem is at least partly the reason they changed the throttle configuration in 08. Since it's a non-repaireable problem in the long run. Other then venting the crank vent outside the intake, which of course would be completely outside of the EPA regulations. So the MoCo is stuck saying it doesn't exist, or finding a half hearted solution. Either way, since this thread is still alive and kicking, it seems to be a widespread 07 specific problem.
Anyway, thats my take on the whole deal.
BTW - I've got nearly 60K miles on my bike and she seems to run better then ever now, as if everything is finally in sinc and worn in harmony.
Now that I said that though - the bottoms gonna fall out of her!

 

The above comment makes me want to bet a six-pack on the TPS, as it can cause all sorts of weird issues from misfiring at cruise, high and/or low idle, and popping. Considering how inexpensive it is, I would go ahead and replace it. If it fixes it that's good, but if not you're only out about $31 and some quality time bonding with your bike. The inside Torx screw is hard to access with conventional Torx wrenches, so I would recommend replacing it with a similar Allen or hex screw.

For those who've been following this thread, I replaced my TPS in June 2011 and all my issues disappeared. But as of about two months ago I've been having an intermittent issue with high-idle (1300 rpm), now happening about once per week, erratic AFR's (rich at idle, lean at roll-on), and 6-10% TP at idle--but only on warm (not hot) starts. It goes away after I turn the engine off and restart. I can watch ECM parameters like AFR and TP on my Power Vision display, and as of last week I decided to also monitor TP and MAP voltage. When the problem happened again Sunday I found that both looked normal. I'm not sure what to conclude from that but I'm still thinking about it. I'm probably going to change the TPS again, though.

To the good fortune of owners of newer TBW bikes, there is no mechanical IAC or TP, so they don't have to worry about it.

 

Been a long time since posting in this thread early on. Anyway I tried cleaning the IAC, cleaning only lasted a little while and problem returned. Replaced the TPS, no luck there. Finally bought a new IAC valve, lifted the tank and replaced it. Original was pretty gunked up. So far after 1000 miles or so the idle problems have disappeared.

 

They can be dis assembled and cleaned and re greased.