Thanks a million!
Differences between 2003 & 2005 XB9
- Thread starter DSophia
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Thanks a million!
Maybe it’s a bad tps. It is a mechanical sensor and the bike is only 15+ years old. It wouldn’t hurt to investigate. I’ve heard stories of the throttle shafts breaking so it’s worth a look.
Installed a brand new TPS, no change. The fuel mixture is definitely effected past 40% since the engine wants to die instead of leveling off, right? Would the oxygen sensor effect the fuel mixture based on the throttle position?
Have you checked fuel pressure? It’s not uncommon for the fuel pumps to start flaking out at this point. The gauge is relatively cheap from Buelltooth.
Or maybe your injectors are plugged and only able to flow enough for low power applications.
You could switch to open loop and bypass the o2 sensor. Upaero would be happy to talk about that.. or you can read about it on the Buelltooth webpage
Or maybe your injectors are plugged and only able to flow enough for low power applications.
You could switch to open loop and bypass the o2 sensor. Upaero would be happy to talk about that.. or you can read about it on the Buelltooth webpage
AFV isn't affected that fast. If the issue is in the tuning, your description sounds when the bike goes from Closed Loop (reading to O2) to Open Loop (reading the map).
What is the EGO corr(ection) value? Should be about 100.
What is the EGO corr(ection) value? Should be about 100.
It has good torque and runs smooth up to that 40% throttle area and will run 70 mph without missing a lick. It’s only when I twist past 40% that it wants to die.
Can I check this with the buelltooth? Which section? I can check when I get home tonight.
It’s under data channels. You can have 4 running on the screen at once. You may need to change one to it to view that data.
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upaero
Well-known member
That almost always means the ECM is trying to compensate for low fuel pressure. rev-mo.com/fuel.
Definitely fuel pump or filter related then? Anything else to check out first? The previous owner said he had replaced the pump not long before I bought it...
upaero
Well-known member
You could have a good pump, but a bad seal causing internal leakage. Check your pressure. rev-mo.com/fuel.
On my XB with the roached motor, one of the corregated fuel hoses had 2 small hoses in it. The reduction in fuel pressure contributed to the lean issues, compounded by the other issues the bike had most likely resulted in the motor seizing, which ruined the pistons/cylinders and the crank due to spinning the rod bearings. Granted the crank could be saved, but thats going to be a fairly expensive process as the crank will likely need to be shipped to Dark Horse to fix the rod bearings, as I can not find anyone else (locally) who is willing to touch it.
The $25 spent on the Rev Mo fuel pressure gauge could save a lot of headaches, missteps in diagnosis and may could potentially save the motor from a lean mix death.
The $25 spent on the Rev Mo fuel pressure gauge could save a lot of headaches, missteps in diagnosis and may could potentially save the motor from a lean mix death.
But sometimes it takes 4 pages for get the point across, LOL. You are an experienced mechanic Barrett, so you know how most people are willing to spend $50... ten times, before spending $200... once. :upset: Just add a zero for newer car stuff. Same game, bigger numbers.
I believe any old mechanic is plenty qualified to change careers to Psychiatry (Or Psychology? whichever is the one that gives out the drugs:eagerness
I believe any old mechanic is plenty qualified to change careers to Psychiatry (Or Psychology? whichever is the one that gives out the drugs:eagerness
Nade
Well-known member
Nothing is ever simple the first time.......asking questions is ok. Can't know everything. learning learning learning
Unless you do know everything and we quiver at the sight of his name........:up:
Unless you do know everything and we quiver at the sight of his name........:up:
No need for any apologies. You asked good questions and got good answers:up:
I hope it doesn't give you any more trouble and you have many years of trouble free riding, these are very basic machines and usually are trouble and maintenance free. Remember they're 15-ish years old though and maintain accordingly
I hope it doesn't give you any more trouble and you have many years of trouble free riding, these are very basic machines and usually are trouble and maintenance free. Remember they're 15-ish years old though and maintain accordingly
I still highly recommend purchasing the fuel pressure gauge from the Buelltooth dude. That will at least verify whether you are getting proper pressure to the rail. From there you at least know you need to either work back towards the pump, or forwards toward the injectors. The Buelltooth dude also offers injector cleaning if that what needs to happen also. I went through Aagaard Moto Foundry to have mine cleaned, and he did a great job as well.
However, it doesnt make a difference how clean or well your injectors flow if the fuel pump isnt up to the task.
Thanks again, I’ll get it ordered. Finally have some time this evening to tear into it.
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