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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Troubleshooting (Poor Starting/Running/Handling/Ride Issues) » XB9SX learnig lean « Previous Next »

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Nomaddamon
Posted on Friday, July 14, 2017 - 05:29 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I have a 2009 XB9SX with 14k km.
The bike keeps thinking it's running rich and leaning out the mixture to the point of knocking. I got the bike a year ago with 10k km and unknown history and the issue has been there from the beginning.

With AFV reset, it will set it to ~85 in a single ride. If it goes under 95 the bike starts acting up and soon becomes unrideable. With "AFV minimum value" set to 95, the bike handles good when riding, but will show EGO correction ~90-95 in idle and exhaust headers will start turning red in about a minute after startup (indicating very lean mixture).
I've replaced O2 sensor, spark plugs and wires but to no avail.

What could cause the bike to think it's running rich and leaning out the mixture to the point of knocking?
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Akbuell
Posted on Friday, July 14, 2017 - 08:17 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Had the same thing happen to my '01 X-1, though not as severe. On my bike, the 02 sensor is on the rear cyl. The rear fuel injector was leaking or 'drooling', causing the rear cyl to run rich. The 02 sensor read the rich mixture and leaned out the AFV to the high 80's, low 90's. Replacing the rear injector solved the problem.

I believe there is an at home check in the service manual to check for a leaking injector; you will need a strong light and have to take off the airbox cover and air filter.

Hope this helps, Dave
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Akbuell
Posted on Friday, July 14, 2017 - 09:04 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Found it. From my '08 service manual -

Remove the intake cover assembly.
Remove the air cleaner cover.

Turn on the key, then turn the stop/run switch on for 2 seconds. Turn off for 2 seconds. Repeat 5 consecutive times. Open the throttle and look in the intake manifold for raw fuel. Replace injector(s) if any raw fuel.

Hope this helps, Dave
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Nomaddamon
Posted on Monday, July 17, 2017 - 02:29 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Hi,

Thanks for the advice, i tried the inspection procedure a few weeks ago but the results were inconclusive - it's really hard to see if anything changed since my manifold is a bit oily/mucky from inside.
In about half the tests, i did smell more gasoline in intake.
I will try to find new injector(s) and see if this helps.
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Gabby_duck
Posted on Tuesday, July 18, 2017 - 03:36 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Remove and Clean your Iac port and both sides of your throttle body butterfly. Reset AFV to 100 and perform a tps reset for 08. Make sure the black rubber cap is still on and covering the port on the throttle body.use a clean lint free cloth when cleaning the throttle body I use Q tips and throttle body spray cleaner. 85 is a lean condition so the ECM will increase injector pulse which means add more fuel.
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Gabby_duck
Posted on Tuesday, July 18, 2017 - 04:02 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

# 1 is rubber cap location seen with airbox etc.. removedEVAP Hose Fitting

https://g.co/kgs/mrRmV7
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Gabby_duck
Posted on Tuesday, July 18, 2017 - 04:43 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Check your plugs what color are they also the old O2 sensor what color was it. You can also read it like a sparkplug. Causes of lean condition could be Dirty or stuck open Iac, Clog fuel filter weak fuel pump, Exhaust gasket or crack Exhaust pipe before O2 or loose O2 sensor.If idle is bad leaking intake seals.leaking intake seals causing bad idle would go away as manifold pressure rises or throttle is applied.Reset AFV to 100 and reset TPS after repair
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