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normal for o2 sensor to idle at 10.1 AFR?

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Old 01-09-2011, 06:01 PM
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Default normal for o2 sensor to idle at 10.1 AFR?

was looking at my O2 #1 AFR on AEM EMS power tuner problem with the car idling and it show 10.1, is that a normal reading?
Old 01-09-2011, 06:43 PM
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if your sensor is accurate, then its really rich at idle.
When had RC injectors, anything higher than 10.5 , sometimes 12 AF at idle would misfire. When I got ID injectors it idled at 14.5-16 without issue.
Old 01-10-2011, 03:33 AM
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I idle and cruise out of boost around 13.5. 10 is stupid rich.
Old 01-10-2011, 09:15 AM
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Yeah fuel wash rich. Idle target should be 14.7. It will normally sweep between low 14's and mid 15's. If your idling under 14 your wasting fuel.
Old 01-10-2011, 09:33 AM
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Originally Posted by Spec_Ops2087,Jan 10 2011, 04:33 AM
I idle and cruise out of boost around 13.5. 10 is stupid rich.


You can idle also above 14 but at least in my car at 14.5 that it was at the beginning it was missfiring at idle.
Old 01-10-2011, 09:34 AM
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Originally Posted by S2000_FUN,Jan 10 2011, 10:33 AM


You can idle also above 14 but at least in my car at 14.5 that it was at the beginning it was missfiring at idle.
Crappy injectors and or too low of an idle pressure to get proper atomization.
Old 01-10-2011, 09:57 AM
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i can't think of a time you would ever wanna hit 10:1....lowest i would ever go is 10.8:1 A/F....
Old 01-10-2011, 10:01 AM
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Originally Posted by vietdragontekx,Jan 9 2011, 07:01 PM
was looking at my O2 #1 AFR on AEM EMS power tuner problem with the car idling and it show 10.1, is that a normal reading?
Is it calibrated correctly on the AEM? Do you have a gauge or just an inline wideband?
Old 01-10-2011, 10:20 AM
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Originally Posted by KwikyMAN,Jan 10 2011, 10:57 AM
i can't think of a time you would ever wanna hit 10:1....lowest i would ever go is 10.8:1 A/F....
Old 01-10-2011, 10:30 AM
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What injectors are you running? My RC550's idle at around 12.7-13.5 at times. It's pretty annoying.


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