| Author | Message | ||
     Vincent |
Does anyone know what the silver solenoid is that is connected to the throttle butterflies via a cable on the opposite side of the engine? I ask this because, when I did the Diag check, I found the TPS to range from 2% to 80%. I was loosing 20% @ WOT because the solenoid was impeding the full travel of the butterflies. I am assuming that this is for the rev limiter or am I mistaken? | ||
| Dalton_gang |
The rev limiter studders the ignition.(I`ve been there a lot) It seems to work like the msd systems on cars. I would guess that the solenoid is for the fast idle during warm up but if it is acting like a stop @ wot I`d say we need to do some adjusting or something. I`m checking mine tomorrow. | ||
| Vincent |
its free to move toward open throttle and doesnt seem to activate any time that i can tell. A rod moves in and out of the solenoid freely but mine has a bit of resistance on it which prevents the flies from opening all the way. If by chance it does activate, it is designed to close the butterflies by pulling the cable attached to the flies. There isnt really any adjustments needed. The arm that moves in and out of the solenoid has a little to much resistance on it for some reason. Its hard to explain really. It is a safety of some sort im sure. | ||
| Baggermike |
Vincent had the same problem and turned out to be that silver tube the vent hose that goes into the filter housing was hitting it and once I pulled up the hose in the hole then I would hit 100. I also wd 40 everything. Mike | ||
| Blake |
That is likely the Thanks Sly for the information.  (Message edited by blake on April 10, 2008) | ||
| Slypiranna |
This is called the throttle soleniod...strickly there for noise emission. It very slightly controls the blades angle during the noisy spot under accel and releases it according to dba limits. I disconnected mine over a month ago/at the throttle body linkage, not the soleniod...and I like the response better. Working on a sub resistor to 86 this weight for good without throwing a code...as it will if you simply remove it! I wondered how long it would take you all to wonder about this! | ||
| Smoke |
mine was similar after dealer maintenance. just didn't feel right while opening throttle rapidly. there was some drag in the cable where it went through the forward mount on the r/h side in front of the silver can. adjusted mount and it is all good now. i like the idea of removing it and installing resistor. tim | ||
| Xb9 |
My understanding is it is called an 'Idle Air Control (IAC)' and the ECM uses it to adjust idle speed since there is no physical idle adjustment. The '08 XB's have it too. From the PDI Document: IDLE SPEED ADJUSTMENT Idle speed is monitored and controlled by the Electronic Control Module (ECM) and the Idle Air Control (IAC). There is no need to check or adjust the idle speed at set up. (Message edited by xb9 on April 09, 2008) | ||
| Xb9 |
I don't think it is wise to remove it. | ||
| Vincent |
Thanks for the info guys. My problem was similar to smokes but adjusted mine and it still hung up a bit. I much like the idea of deleting it myself and will surely do so if it is just for emissions. I hate the fact that we cant even reference a book to verify what is what. It doesn't help when you get conflicting responses which is nobody's fault but BMC's. Either way, Its already disconnected at the linkage and it seems to idle fine and it runs much better now that I get full travel. Thanks for the help everyone. Cant wait to get my hands on a damn manual....... | ||
| Blake |
Sly, Where did you obtain that information? | ||
| Slypiranna |
Blake, I am assuming that you mean what it is called and what it is there for? The following answer has nothing to do with what I am doing to it and by no means was recommended...NOR have I recommended it herein. So, with that out of the way and with very great hopes that no one is to get into any trouble... answer...Certified HD/Buell 1125 tech. PM me if you need to go further on this please. | ||
| Xb9 |
now that is scary  | ||
| Slypiranna |
Your scared over nothing. No drama meant and no drama wanted here. I was just answering Blake...with respect and regard to what has become warning sign from what I've read "here". While I'm used to stepping on my #^$!...it's not something that feels good to do so...so I try to look down now. | ||
| Blake |
I can happily confirm the accuracy of Sly's explanation. The thing is for passing noise emissions testing and may be safely removed with the only ill-effect being an error code reported by the ECU. Word is that many motorcycles now use similar and even much more extravagant schemes in order to defeat/pass various specific noise emissions tests, some devices are used by some manufacturers the exhaust tract as well; they only activate at the prescribed noise-test engine speed and throttle combinations required. I dig it! Very Smokey Yunick! ![: ]](http://www.badweatherbikers.com/buell/clipart/proud.gif) (Message edited by blake on April 10, 2008) | ||
| Xb9 |
I see it now on the wiring diagram, it's called an 'active intake solenoid'. The IAC is on the left side of the throttle bodies. My bad. I need to study more. Apologies to Sly for the scary post. | ||
| Jos51700 |
Rev limiters drop fuel, and occasionally, spark, when "stuttering" the engine. Just dropping spark (as carb'd motors do) sends lots of unburnt fuel out the exhaust, thus killing lots of baby whales. | ||
| Blake |
Yes, but how does that effect the contact patch? | ||
| Ccryder |
Contact patch, CONTACT PATCH!!!!!!!! Where's the darn teflon tape when you need it????????????????????? Time2 go home and pack for Tellico Plains. Wer'e outa here....... | ||
| Dtx |
So your saying this is something we can take off and (maybe) gain a little more zip?  Not that the bike needs it. Stock power is amazing.  Ironically, a few days ago I thought about posting a question on here about the smoothness of the throttle. Compared to my XB, it seems it is a bit harder to rotate. This could be the reason. Last weekend I went on a 4 hour ride and I gotta admit, by the end of the ride I was tired of holding that thing open. It's just not as "light" as the XB throttle. Maybe I should lube it up like Bagger said. (Message edited by dtx on April 10, 2008) | ||
| Baggermike |
I rode a couple hundred miles today and what I do is unscrew one of the cables to the point the throttle will stay right were you put it but still will go to idle if you just twist it back, it is like having a friction lock and on the highway I could ride far just sitting and not holding on, I also was getting gas mileage in the 40's and would say probably 42 mpg averaged at 60 mph, I was going slow for a reason. | ||
| Xb9 |
I removed the cable to the 'active intake solenoid' this evening, but left it there with the wiring intact. My observations: 1. Throttle is easier to rotate ( I also noticed stock there was more effort to twist it or hold it in a position than my XB. Now it feels about the same. That's a nice plus since my hand was cramping up bad on a 330 mile ride last Sunday) 2. Seems alot smoother cruising in the 3-4K range where before it would be a bit jerky like the fueling wasn't right. 3. No trouble code set after a 20 minute ride. | ||
| Dtx |
Sweet! We may have unlocked something here. XB9 - Any pics or details on the procedure? When I first bought my bike I took the airbox off to see those awesome throttle bodies. I didn't take off the base, though. Started to, but then realized without the service manual (and having a brand new bike) I didn't want to "tear into it" too much. I am guessing once the air box and base is off, the procedure is pretty simply and straight forward... | ||
| Slypiranna |
DO NOT DISCONNECT AND REMOVE THE SOLENOID ITSELF JUST YET/ELECTRICALLY! While Blake may have confirmed what I wrote in this thread...it simply just does NOT throw a simple record of trouble code. FACT>and I don't care to hear what anyone else "thinks" on this one. That is the reason I'm working on the proper load sub resistor to take its place. Be patient and don't get overloaded on making more hp here. This is a minor, very minor loss in weight/gain in throttle control that we are talking about. If you must do something, disconnect the cable ONLY at the t/body and tie wrap it outta the way. Leave the noid alone for now until further r/d is completed. I promise to post the finds. | ||
| Vincent |
Real easy to disconnect, just follow the cable around the front of the engine to the left side, the left as if you were sitting on it, to the belcrank linkage. Pull on the cable as this will cause slack by pulling the solenoid arm out. When you have the cable with enough slack (cable should be approximately 90 degrees in reference to belcrank or perpendicular) slide it out of the slot. Be sure to stick the cable out of the way of moving throttle parts. Do not disconnect the electrical connector as this will throw a code. All this needs to be done with ALL the airbox components off. | ||
| Slypiranna |
...concerning my last entry above, what I should have said instead of I don't care what anyone thinks about this... Correction...I don't want assumptions, I want to know facts concerning this electrical deletion...which we soon will. Just doing my best to even correct myself in how I "sound" or am perceived in my wording. Thanks, m&m | ||
| Dalton_gang |
I`m starting to think that Jos51700 may be right about how the rev limiter works. Had the air box cover and filter off today and tried to get video of the atomized fuel getting sucked into the throttle bodies. (couldn`t get enough light in there)When I got into the rev limiter it sounded a lot like fuel starvation. Does anyone know for certain how it works? I`m also wondering if the inlet for the airbox is big enough to satisfy the demand of the giant throttle bodies. Looks like it`s about 5 1/2 sq inches on the inlet air duct and the throttle bodies are well over 14 sq inches. There has got to be some serious air velocity running through the air duct and vacuum being contained in the air box. I`m starting to think that the air box needs some holes drilled into it. | ||
| Dalton_gang |
Also I`m taking Sly`s advice and disconnecting the throttle solenoid cable. | ||
| Baggermike |
Dalton I also seen it and here is my .2c worth, I think they did this for noise I took off the inner air box cover and the plastic around the gas filler hole, the other night I gave it a healthy does of throttle and came up on me and my head went down and the noise coming from the intake hurt my right ear and I am hard of hearing, sounds bad ass now, almost like I added an exhaust on the bike. I wonder what it sound like riding by? Mike | ||
| Sheridan_bueller |
So does this 'mod' gain anything other than noise?? Noise is good but power is better. I'm just wondering, I don't recall reading the result of disconnecting the solenoid other than the noise. JJ |
