C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Lean O2 code with BLM 122 at idle

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Old Aug 2, 2011 | 10:30 PM
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Default Lean O2 code with BLM 122 at idle

What would cause this issue? O2 voltage swings between 220 and 840 mv at idle and BLM is steady at 122. I still get error code 44.

Should I add more timing? It's at about 20* total at idle.

Thanks,

-J
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Old Aug 2, 2011 | 11:47 PM
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More timing will make it leaner. 122 is rich not lean. Not sure how you are getting a lean O2 code with that. May be lean under load setting the code.
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Old Aug 3, 2011 | 12:04 AM
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I'd hesitate to recommend it needs timing at idle without seeing the other operating conditions and where the timing is set, but it could probably take a little more.

122 is rich though. Did you go through the manual procedure for checking the 44?
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Old Aug 3, 2011 | 12:21 AM
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I'm with JackDidley. It doesn't sounds like idle is what is tripping your error code. That seems to be somewhere else.

If you clear it, does it come back while idling?
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Old Aug 3, 2011 | 09:21 AM
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The car is just sitting still idling no load. It gets code 44 after idling for about 3 minutes or more in closed loop.

I was thinking that maybe there is too much oscillation and there might be a way to dampen it?

-J
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Old Aug 3, 2011 | 09:54 AM
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Oscillating is what a narrowband sensor is supposed to do. It is when it isn't oscillating you typically have a problem.

Do you have any form of data log?
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