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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Troubleshooting (Poor Starting/Running/Handling/Ride Issues) » Archive through May 25, 2007 » XB9 FOULING PLUGS & CHUGGING WITHIN MINUTES? « Previous Next »

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Toold2play
Posted on Saturday, May 19, 2007 - 08:04 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I just got the bike I just had shipped only to find it running on what seemed to be one cylinder! AH HA! Fouled plugs! I bought new Buell Split fire plugs and went thru the unbelievable contortionist task of changing them out. Started the bike again and it ran fine for 15 minutes or so. Back to the rich black smoke condition AGAIN! 4810 miles on her. What can it be?
Help! I don't want it running badly when I have to take it in to the local Dealer (read rip off) for it's 5000 mile service!
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Sparky
Posted on Sunday, May 20, 2007 - 12:26 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

It's quite possible the EFI needs to adjust the closed loop operation for your area's ambient climate and altitude. When it does this it normalizes the AFV (Adaptive Fuel Value) to 100%, but this number is just for reference as it can only be read by a HD tool known as a Scanalyzer (or there are aftermarket software programs that can do this with computers).

The closed loop operation is controlled mainly by the oxygen sensor. The recommended procedure to adjust the AFV is something you can do yourself. And it's fun! Just ride the bike in the top gears at 3000 to 3500 rpms continuously for about 10 minutes or so.

If this procedure is followed and the bike still runs badly as before, this could be an indication of a faulty O2 sensor or some other EFI malfunction in which case there should be error codes to monitor. Normally if the Check Engine Light comes on, it should store an error code as an indication of a problem.

So, after you changed the plugs how did you run it for those 15 minutes? Idled it, rode it around for a couple blocks or ran it at 3500 rpms uninterrupted?
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Toold2play
Posted on Sunday, May 20, 2007 - 07:36 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I rode it around the neighborhood and it seemed to be running rich with black smoke. I read on the site to ride it @ 3000 plus rpm for a while and IT WORKED! Now when I start it, it will idle and run smoothly. Thank you for this site!
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