Hello guys, roughly a year ago my Buell began giving the o2 inactive error while going more than 80kph, so because the sensor was old I thought that was the cause of the problem and I replaced it with a Bosch 12014 without looking much more into it.(My Buell is a xb12xt from 2008 with 42000km with k&n filter and stock exhaust.)
This only did so much because it still gave the error (not as much as before) and the bike was still running bad, it lacked power and accelleration and got way too hot making the bike go into thermal protection at 280°C while crusing at more than 120 kph.
So I bought the ECM bluetooth doungle to log my ride and when I opened them up in MLV I saw that the AFV was set to 76 and the o2 sensor when the bike got up to speed reduced its maximum output from 0,67 to 0,55.
After numerous hour of research I got to work and here what I've already done:
-checked and grinded clean the ground contact with the alu chassie and with the engine.
(this raised the voltage of the o2 sensor noticeably (avrg: old 0,58 / now 0.78)which explains the 02 inactive code)
-injectors cleaning and Ohm check
-TPS and AFV reset
-ignition leads Ohm check
-spark plugs replacemet vxu24 denso
-compression ckeck both 155psi
-repositioned the ecm
-o2 sensor ground and lead Ohm check
-fixed the ground wires on the steering neck that were cut off
But this didn't solve anything other than raising the o2 sensor voltage and increasing the afv to around 80% with the stock map
While the throttle body was disassembled for cleaning I snuk an endoscope into the cylinder and saw that the piston was covered in black soot in both cylinder and alsothe intake valve where all dirty
rear cylinder
front cylinder
front valve (same as rear)
Another thing that might be worth to point out is that when the cooling fan turn on the clt sensor temperature increase of 9°C, I don't know if it is adjusted by the ecm or it's the cause of some sort of electrical problem, that might affect also the o2 sensor and the tps.
Also the bike seem to sneeze a little from the intake valve but this sounds goues down at about 3000 rpm.
Furthermore yesterday during one test drive with and eeprom that had decelleration fuel cut off enabled (I wanted to try what it was about) while crusing at highway speed the engine died for like 2 sec and came back to life only to repeat this at 5/10 sec intervals for as long as I didn't slowed down.
I've looked through the msl file and noticed a few spikes of the tps voltage to the equivalent of WOT so after that the ecm considered it a deceleration and completely tuned off the fuel making it starve. But this only occured at over 100 kmh
The bike with the closed loop/open loop learn disabled and afv locked to 100 runs like a champ!
It has more power and acceleration and also runs a loot cooler, while crusing in the summer (30°C ) at 140kph the clt sensor reached 240°C and during normal use it stays at around 210°C (this reading is probably biased so take it with a grain of salt).
With this in mind I think that this promlem is more electrical than mechanical but I'd love to see if someone can point me in the right direction, because at this point I don't really know what to look for.
Thanks for reading through all of this but I'm desperate for a solution and wanted to give as much info as I can, sorry
Let me know if I should also upload some maps and logs.
This only did so much because it still gave the error (not as much as before) and the bike was still running bad, it lacked power and accelleration and got way too hot making the bike go into thermal protection at 280°C while crusing at more than 120 kph.
So I bought the ECM bluetooth doungle to log my ride and when I opened them up in MLV I saw that the AFV was set to 76 and the o2 sensor when the bike got up to speed reduced its maximum output from 0,67 to 0,55.
After numerous hour of research I got to work and here what I've already done:
-checked and grinded clean the ground contact with the alu chassie and with the engine.
(this raised the voltage of the o2 sensor noticeably (avrg: old 0,58 / now 0.78)which explains the 02 inactive code)
-injectors cleaning and Ohm check
-TPS and AFV reset
-ignition leads Ohm check
-spark plugs replacemet vxu24 denso
-compression ckeck both 155psi
-repositioned the ecm
-o2 sensor ground and lead Ohm check
-fixed the ground wires on the steering neck that were cut off
But this didn't solve anything other than raising the o2 sensor voltage and increasing the afv to around 80% with the stock map
While the throttle body was disassembled for cleaning I snuk an endoscope into the cylinder and saw that the piston was covered in black soot in both cylinder and alsothe intake valve where all dirty
rear cylinder
front cylinder
front valve (same as rear)
Another thing that might be worth to point out is that when the cooling fan turn on the clt sensor temperature increase of 9°C, I don't know if it is adjusted by the ecm or it's the cause of some sort of electrical problem, that might affect also the o2 sensor and the tps.
Also the bike seem to sneeze a little from the intake valve but this sounds goues down at about 3000 rpm.
Furthermore yesterday during one test drive with and eeprom that had decelleration fuel cut off enabled (I wanted to try what it was about) while crusing at highway speed the engine died for like 2 sec and came back to life only to repeat this at 5/10 sec intervals for as long as I didn't slowed down.
I've looked through the msl file and noticed a few spikes of the tps voltage to the equivalent of WOT so after that the ecm considered it a deceleration and completely tuned off the fuel making it starve. But this only occured at over 100 kmh
The bike with the closed loop/open loop learn disabled and afv locked to 100 runs like a champ!
It has more power and acceleration and also runs a loot cooler, while crusing in the summer (30°C ) at 140kph the clt sensor reached 240°C and during normal use it stays at around 210°C (this reading is probably biased so take it with a grain of salt).
With this in mind I think that this promlem is more electrical than mechanical but I'd love to see if someone can point me in the right direction, because at this point I don't really know what to look for.
Thanks for reading through all of this but I'm desperate for a solution and wanted to give as much info as I can, sorry
Let me know if I should also upload some maps and logs.
