| Author | Message | ||
     Tpoppa |
I had 03XB9S that I rode for 34k. Overall it was bulletproof. I sold it and bought a 05 XB9SX with 4k(stock except for a K&N) that has been...not so bulletproof. On my 03, the idle was always constant between 1050-1100, on the 05 the idle moves from 900-1300. It seems like the ECM is constantly hunting for the correct rpm. Does this mean there is some underlying issue or is it a difference between the 03 & 05 ECMs? What would cause the ECM to 'hunt?' an exhaust leak? intake leak? BTW, the 05 has new Iridium plugs and a recent TPS reset. Neither has made any difference with the idle. | ||
| Ochoa0042 |
have you talked to the previous owner? has this just started to happen, or always has been since you've owned it? | ||
| Rpm4x4 |
My 05 XB9sx does not hunt at all and has been bulletproof as well. I have almost 22k so far. My idle rests solid at 1050rpm. | ||
| Brumbear |
the only thing I can think of offhand is a small vacum leak or a loose timing plate or fuel pressure issue everything else is sensor adjusted as far as I know | ||
| Tpoppa |
I've put about 4k on the 05. The idle issue has been there since I got it. It seems to run just as strong as my 03, but doesn't accelerate as smoothly from 3k-4k. I tested for intake leaks per the manual with propane. I don't believe the intake is leaking. | ||
| Andymnelson |
Most common causes for a "hunting" idle: - intake leak - incorrectly set TPS (or a bad TPS, but that's much more rare) - "gummed-up" intake. If the bike sat even for 1 winter with bad fuel that was not Stabil-ized, then it can ruin everything. This happened to a buddy of mine recently- he bought an '07 Uly with similar problems. Ran a can of Sea Foam through the intake and all is well. That stuff is a miracle worker- I would seriously try it...it's not too much money for something that could fix your problems. | ||
| Blake |
Try adjusting the idle down? | ||
| Tpoppa |
--Start up idle around 1100. I assume managed by cold start enrichment in the ECM. --After 1 or 2 minutes, it idles between 900-1000. --At normal operating temp it idles between 1050-1300. Basically, at 1 stop light it idles just fine, at the next it'll be a 1300. It continues to 'hunt' with no rhyme or reason that I can figure out. I may give the Sea Foam a shot. The previous owner was not motorcycle savvy. I wouldn't be surprised if it was stored incorrectly. | ||
| Blake |
Try adjusting the idle down? | ||
| Blake |
I only ask because of reading about a number of cases just like yours that were resolved by adjusting the idle down. It sure won't hurt to try. The "sea foam" I don't know. Seems like a potential risk for the O2 sensor. Might remove it first to be safe. | ||
| Tpoppa |
I've adjusted the idle quite a few times. Actually, been bringing an allen wrench with me on rides to adjust it down when it jumps to 1300. But then the idle will be to low half the time.. It seems that the ECM is hunting, but what would cause that? Input to the O2 sensor like a lean condition (although I'm not seeing other signs of running lean). Possibly an O2 sensor going bad? | ||
| Froggy |
I would lean towards an intake leak. | ||
| Ez_rider |
If you have ECM Spy, check the indicated engine temp while running at idle (after fully warmed up). I had the same symptoms, and it turned out to be a loose temp sensor on the rear cylinder. As the indicated temp fluctuates (due to a loose sensor), the ECM adjusts the mixture and idle, thus causing the idle speed to "hunt" and fluctuate. Not just a "theory", this really happened to me. | ||
| Tpoppa |
EZ, I do have ECM Spy and I can check the temp. Do you recall how much the temp would fluctuate? | ||
| Ez_rider |
It was all over the place. I don't remember the exact amount, but the needle was jumping wildly, very noticable, probably 50% or so. The temp indication should be rock-steady and not bounce more than a couple degrees. | ||
| Aptbldr |
My '04 XB12 intake seals were leaking when hot at 4500 miles. AFV went to 128+/- relentlessly; waiting for me to catch on. Throttle bore clean? Butterfly valve clean & lubed? Throttle cables clean, lubed & properly adjusted? | ||
| Blake |
Bad TPS reset. | ||
| Ulynut |
Could also be a throttle cable gone bad. Frayed or lack of lubrication causing the cable to hang up inside the sleeve. | ||
| Xoptimizedrsx |
The Idle. Its 90% a hunt from the fuel map as its in closed loop allowing the ego to correct the fueling. one goes one way the other the other. so its constantly bouncing. its real easy to see this on the daul wide bands. There is a few fixes. First start with a tps reset. Next take the bike out for a ride with an Allen key on hand. Once you are up to temp stop and set the actual rpm to 1000 rpm. Now dont worry about the deg. If the fuel is still bouncing. you can look at the ego value. if its below 100 you are rich if above you are lean. now open the fuel map. click the ICON keys (key). check the direct cell box the Yellow cross hairs. you will notice the ecact idle cell you are at. now id it on the line between 900/1000 do this. go to the 1000 rpm all the way at the top right click it. Now click edit make it 1200. you will see the line fall back to the center of the 900 row now. this is your direct Idle fuel cell. front and rear. you can adjust the fuel a little at a time till its ego value is at or bouncing 98 to 102. your done. copy this fuel and add 4 points to it on the front. thats the avg i see from the 6 different pipes i have. I did all my test with Daul wide bands. now to lock the 1200 set rpm into the ecm burn the eeprom from the eeprom page before you do anything. This simple stage gets you the fuel at Idle set. you can over set the tps to the next cell up to check its ego value also. then back the ego down when done. once this is all set feather the surrounding cells to the direct cell values you set. the above sets this to the Stioch of 14.7. If you want a different way you can. you can un-check the idle closed loop in the configuration page. Then burn it in from the eeprom page. this allows the Idle to now be open for a complete different value. but dont get carried away with low afr values. Hope this helps you guys. mike | ||
| Tpoppa |
--Throttle body is clean (now) --Throttle cables are moving freely. --I reset the TPS again. --I added fuel system cleaner at the last fill up. Still no improvement with the idle. If I can't find any mechanical issue that is causing this, I'll try the ECM fixes that Mike provided. In addition the the idle issue on my 05. The fuel mileage isn't quit as good as my 03. The 03 was consistently between 48-50 mpg, even for aggressive riding. The 05 will get 48 mpg for riding around town, but for aggressive cornering it drops to 41-43 mpg. Any ideas??? | ||
| Tpoppa |
If the fuel is still bouncing. you can look at the ego value. if its below 100 you are rich if above you are lean. I checked this in ECM Spy and the EGO value was bouncing between 104 & 110, so I am lean, at least at idle. The bike is stock except for a K&N, so what could be causing the lean condition? --Intake leak? I checked this with propane, per the service manual & it seemed ok. --Exhuast leak? --O2 sensor going bad? I'm kinda stumped on this one. | ||
| Bumblebee |
Mine had the problem, the problem was traced to a defective TPS connector. My Techno Research VDST Scan Tool gizmo helped locate the problem. This is what I have: http://www.technoresearch.com/Products/VDSTS-Motor bike/VDSTS_Motorbike_Features.htm It has paid for itself many times-just in TPS resets alone! | ||
| Tpoppa |
BB, That is an interesting thought. I am not getting any codes. I dont't have VDSTS, but ECM Spy checks --TPS Shorted (+) --TPS Shorted (-) Is that the same thing? Is there any way (other than replacement) to check if the TPS, O2 sensor, etc is going bad? |
