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Does anyone have a guide for factory AFR ranges from vacuum~13 psi?
I’m tracking down a wiring problem on my van and have a wideband O2 hooked up but don’t have any experience on what is normal. ARF settles in at about 11.4:1 at about 10 psi. AFR seems slow to react around 0 psi. Sometimes it’s about 12:1, others its closer to 14:1 and hangs there. At about 7 psi it drops to 12.1~11.4:1
 

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that's how the stock computers do it. If they're not worried about it I wouldn't either. But having it richen up earlier does make the power come on butter smooth.
 
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