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Type: Posts; User: upaero

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    How to diagnose most Buell EFI problems

    I have added this section below to the troubleshooting page at rev-mo.com/efitroubleshoot. Instead of randomly replacing parts based on a hunch or something you read online you can actually see what...
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    You could have a good pump, but a bad seal...

    You could have a good pump, but a bad seal causing internal leakage. Check your pressure. rev-mo.com/fuel.
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    That almost always means the ECM is trying to...

    That almost always means the ECM is trying to compensate for low fuel pressure. rev-mo.com/fuel.
  4. Llama, you are close to sea level correct? Since...

    Llama, you are close to sea level correct? Since I started requiring people include their AFV with requests for tune files I have found that a vast majority of bikes are in the 85-90% AFV range at...
  5. Thread: Ecm

    by upaero
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    If your ECM had the "Uly" problem you would see a...

    If your ECM had the "Uly" problem you would see a laundry list of stored faults. Check your AFV which will tell you if the ECM has been compensating for low fuel pressure.
  6. Thread: Ecm

    by upaero
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    Before changing an ECM or any other part you...

    Before changing an ECM or any other part you really should do some simple diagnostics using a Buelltooth and Ecmdroid. If you do have to replace the ECM you're going to need them anyway to do a TPS...
  7. Thread: 2001 X1 Project

    by upaero
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    Iíve posted the pulley and belt combination you...

    Iíve posted the pulley and belt combination you need twice now. You can lead a horse to water...
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    You did NOT read on the Buelltooth site that a...

    You did NOT read on the Buelltooth site that a mechanical problem can be remedied with a "map". On the contrary actually.
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    The air temp sensor and fuel pump codes are...

    The air temp sensor and fuel pump codes are remnants of having the bike turned on while those were disconnected, so you can disregard. The AMC error mask should already have been unchecked, but...
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    Yes you should be fine as long as the AFV doesn't...

    Yes you should be fine as long as the AFV doesn't drop again. Don't be afraid to try open loop with the AFV at about 103. It will help drivability and run cooler with negligible effect on fuel...
  11. [QUOTE=Barrett;626794]the "regularly scheduled...

    [QUOTE=Barrett;626794]the "regularly scheduled thread path" has taken us to this: none of my Buells or any of my three XR1200's have one of these nonsensical QS devices installed. why? because my...
  12. Thread: 2001 X1 Project

    by upaero
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    YES! Stock XB rear pulley, 29T front and a 132T...

    YES! Stock XB rear pulley, 29T front and a 132T belt.
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    Ah, ok. At the ~1100' elevation of Phoenix 83.5...

    Ah, ok. At the ~1100' elevation of Phoenix 83.5 is very low, and explains why your bike was running so bad. It's very common (more often than not I would bet) for these bikes to run unnecessarily...
  14. Blipping the throttle to "RPM match" for...

    Blipping the throttle to "RPM match" for downshifting is perfectly fine, but when upshifting you need a quickshifter if you want to "bang through the gears". Each of my bikes including an HD...
  15. This is not recommended without a quickshifter to...

    This is not recommended without a quickshifter to unload the transmission, which allows the gear change to happen safely and smoothly. Eventually something in the trans is going to give. Of course...
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    Checking your AFV should always be step 1 and can...

    Checking your AFV should always be step 1 and can be done in about a minute. If it adjusts itself to a number significantly higher than 100 that is normally indicative of low fuel pressure. When...
  17. The engine temp he is seeing is in Celsius. The...

    The engine temp he is seeing is in Celsius. The warm up enrichment (WUE) tables enrich the fuel until about 200C. The fan doesn't come on until 220C. This is measured right at the top of the head,...
  18. It should be close to 100 at sea level. ...

    It should be close to 100 at sea level. rev-mo.com/afv.
  19. Check your AFV on the ECM parameters/AFV settings...

    Check your AFV on the ECM parameters/AFV settings page of ecmdroid.
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    I thought this thread was going to be about...

    I thought this thread was going to be about stumbling Buells.

    I'm trying to imagine what would have happened if HD had sold Buell to Bombardier (actually BRP). An American sport bike brand...
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    Hunting idle and coughing through intake are sure...

    Hunting idle and coughing through intake are sure signs of a lean condition. Did you replace all of the seals and o-rings on your pump assembly and did you check the fuel pressure afterward? The...
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    Old enough to remember logging in to "bulletin...

    Old enough to remember logging in to "bulletin boards" on my Commodore 64 using one of those modems that the receiver of the phone sat on top of. Is that still a thing?
  23. If you want to get into the nitty gritty of the...

    If you want to get into the nitty gritty of the ECM maps and settings I suggest you get TunerProRT. It gives you access to all of the defined parameters of the EPROM file, not just some of them. ...
  24. You can easily make a "global" change to the...

    You can easily make a "global" change to the mapping to see what effect it has in that area and if it has any negative side effects somewhere else. If I knew what your AFV is I could make a...
  25. I'm willing to bet it needs more fuel in that...

    I'm willing to bet it needs more fuel in that area of the mapping. How does it run in the part throttle ~3000 RPM range? They're known for stumbling in this area which is often disregarded as...
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