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AEM A/F meter oscillating voltage


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I had my Aem A/f meter for years now. Never replaced the sensor.

I have the emanage ultimate on my ep91 and recently i data logged some pulls and noticed that the afrs oscillated a lot , not showing same on the display.

So i stopped to check if the aem display and on my pc matched. On idle the display shows idling 14.7 steady but on the pc ( emanage ) oscillating from 13.1 to 15 rapidly.

I know that i need to allow .1 or .2 but not that much.

Is that the sensor or the gauge problem?

Im using the white wire by the way 0-5 v and set the emanage from 10 - 20

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