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Warm Up AFR Question

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Old 02-28-2013, 09:11 AM
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Warm Up AFR Question

I have a feeling my front O2 sensor is acting flukey but it shouldn't have any effect on cold start right?

Right when my car starts up AFR goes to 20.5 for 20-30 seconds before it drops to the normal rich AFR.... is that normal? maybe i got a old computer flash I think I still need MSP-16
Old 02-28-2013, 09:16 AM
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Originally Posted by DinSum
I have a feeling my front O2 sensor is acting flukey but it shouldn't have any effect on cold start right?

Right when my car starts up AFR goes to 20.5 for 20-30 seconds before it drops to the normal rich AFR.... is that normal? maybe i got a old computer flash I think I still need MSP-16
That's normal; it's high when the air pump is running.
Old 02-28-2013, 09:57 AM
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Puts my mind at ease, thanks!
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