2009 Buell XB12SCG, Runs rough when warm

[Milborg]

All right, with proper compression and intake popping, I would suspect timing.
The 2009 has a new crank position sensor on the front of the crankcase and no mechanical timing adjustment possible.
Maybe the crank position sensor or its terminal/plug/connection to the ECM is bad?
I can se that Cooter is at it already.

 

[Skibum41061961]

I am going to try and answer to everyone's post.
It has been colder and uglier weather here recently, we have started the bike a couple of time but it will not hold idle, it will stay running so long as we give it throttle. If we give throttle and hold it, the bike will pop out of the exhaust similar to my last post. If the RPM begins to drop and we open the intake, we get some popping coming from the intake. Ive looked at the injectors through the intake with a mirror and found no gas or drips. When we hook up a fuel pressure gauge inline between pump and injector, it holds 49psi. Also we had previously noticed that as the IAC opens up the bike seems to run worse and smells rich. As if the ECM is opening the IAC to lean out an insanely rich condition? We are also talking with IDS to see if they could give any insight.

buellstorm,djung We have added the extra grounds as well as cleaned off the existing grounds and cleaned the point of where the subframe meets the frame, no change.

der_jones We have changed the "Min engine temp" to 130*F but considering the bike will not even idle we did not notice any effect of changing the parameter.

Cooter, we have yet to hit the *CPS with a heat gun. Our thought is that considering the change in temperature between my previous post (outside temp approx 70*F) and now (temp closer to 40*F). We assume that if hitting the *CPS with with heat would make it run worse then realistically in this colder weather the bike should run better? We will still be hitting with the heat gun though just to see if anything does change.

Millborg, in my older posts when I said the TPS would change to 8 when running rough, I was mistaken or this issue is no longer happening. The TPS remains at 4-4.5 when the bike idles, on the logs and screenshots where you see the TPS changing, this one of the techs twisting the throttle.

My 2008 Buell Ulysess runs fine in most conditions. IN the Winter I taped off the oil cooler the the air scoops to the rear cylinder. My Yamaha FZ-07 makes more and more power the colder it gets. The Buell though I don't recall any issues at idle, it bogs if the temps are below 45 or 40-F I was guessing that besides the engine being too cold do to being air cooled I guessed there are no tables for such cold weather in the ECU. Ask IDS about this as I am curious to know the answer too. You could always do a compression test. I suppose you don't have bad intake valve seats and the wrong cam timing.

 

[cvc]

Did you take a break for Christmas?
Reading the entire thread the last post stating minimum engine temperature said that you set the value to 130 F not C. Then if all sensors are checking out you should do a wiggle test. Try before the bike reaches the temperature that it’s been giving the trouble if a wire is opening once hot it’s still compromised cold just no symptoms.

 

[34nineteen]

Resetting AFV will not remedy anything. AFV will, almost imidiately, be adjusted again according to EGO.

but it will indicate if running at 100 AFV will make the bike run correctly. Its not a remedy but a diagnostic.