Reply With QuoteI would try putting in new plugs. They might be fouled. If you have ecmspy you can check your afv to see where it is at too.
I have an '07 XB12Ss that has been giving me issues. It starts up initially just fine. Then a few seconds later the RPM's drop below 1k. The engine starts to sputter and cough, then just shuts off.
The back story on how it started and what I have done so far. I took the bike up to Colorado to run around the mountains. It ran flawlessly at the higher altitudes. I brought it home to kansas (trailered it) a few thousand feet lower than what I had been riding. I tried to start it and go for a ride and I had the symptoms I described. I figured the brain just had to reset itself to the lower altitude. No luck there. After that I had to go away for work for a few months.
Since then I have replaced the TPS. TPS reset (I hope I was doing that correctly). Fault code is 21, interactive muffler control (that was modded by the previous owner, and their is no mechanical cable for it). Pulled the plugs, they look good. Today I drained the fuel (thought maybe I got bad fuel on the last fill up), put fresh full and added a fuel system cleaner. None of that stuff has made the slightest improvement.
I'm looking for any help you guys may be able to provide. Thanks in advance.
Here is a YouTube link to show what it is doing.
https://m.youtube.com/watch?v=UcDRuoVziqM
I would try putting in new plugs. They might be fouled. If you have ecmspy you can check your afv to see where it is at too.
Check for proper o2 sensor operation.
^^^^^ the above great advice plus: confirm you reset tps as per what i listed below...gentle ride mandatory. reactivate ecmspy and clear the IEV code, then reset, then go to IEV block/tab and deactivate same. perhaps this was never done and if not, it should be.
tps reset sequence:
motor should be to operating temp
obtain your 0 value. it MUST zeroed out
then and only then click "reset tps" tab.....and "confirm" tab
now turn in idle speed screw clockwise/inward to obtain reading between 5.1 and 5.5. i prefer 5.1
now bring bike back up to normal operating temp and adjust warm idle curb speed to approx. 1K
go for gentle 25 or so mile ride. by gentle i mean no redline runs, no WFO throttle, no long steep inclines, no extended idling. normal reasonably gentle riding in learn mode is the key
Thanks for the quick replies.
I had started to do the TPS reset, but didn't get very far. Between all of the start attempts recently, the battery hasn't recharged and my battery died. Hooked up to a battery tender right now, so I probably won't get another chance to work on it today.
So far on the TPS reset, I was able to clear the code that was on it. I hadn't done that before on my previous attempts. I did the reset on it. Now when you say it must be zeroed out, you're referring to the block with the % symbol. That is what I had been doing. Then the additional 2 turns. Reset TPS. Turn it back in to 5.1.
After that I started it up and it did the same thing. I was only able to start it 3 times before my battery started giving me issues.
My plugs looked good when I pulled them before. Tonight when I will go out and pick up some new plugs.
Also suggested was to check for proper O2 sensor operation. I know where it is located, but I'm not sure about checking it out for proper operation. I haven't gotten any codes suggesting an issue with it.
The video is very helpful. My first thought is a fuel supply problem. Thinking of things that would allow a good initial supply of fuel but then not be able to keep up with demand, such as dirty fuel filter or low fuel pressure.
One member had the internal rubber velocity stack come off and was sealing itself to the air box lid. Check that, doesn't happen often.
I'd try messing with the idle adjuster near left side scoop.
Then I'd try another ECM, half the time it's some kind of ECM issue. Unplug it then plug it back it first
that's correct. you mentioned your cable from air box IEV unit to muffler is missing. if that is the case there can be multiple reasons but one possibility is that the air box mounted unit failed. for that reason i mentioned deactivating the IEV feature with ecmspy. if you deactivate same you will no longer receive trouble code #21So far on the TPS reset, I was able to clear the code that was on it. I hadn't done that before on my previous attempts. I did the reset on it. Now when you say it must be zeroed out, you're referring to the block with the % symbol. That is what I had been doing. Then the additional 2 turns. Reset TPS. Turn it back in to 5.1.
Bought a bike to flip with similar issues - figured I could figure out the (I suspected) ECM issues and make a couple bucks. Found that battery ground was bad at the frame rail. Would run with throttle after startup, but otherwise just dropped RPM and stalled within maybe 10-12 seconds. That was the easiest fix/flip ever.
The stuff above is all very good and more likely your issue (though a 21 isn't something I'd be worried about), but I'd start with the easiest solution and work down. There are a number of threads on terrible stumbling/midrange that were nothing more than a bad ground.
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....and just watched your video. looks identical. check all the grounds!
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