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always lean at idle

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starfish

10+ Year Contributor
450
2
Feb 20, 2010
Hamilton, New Jersey
MY turbo kits not on the car yet because I'm still waiting for the final parts,but I installed my F/A gauge acouple days ago and it always runs lean at idle(900rpms) and then bounces back and forth when I'm driven about 3000rpms I scanned for codes a couple times but every thing is clean.Is this normal?
 
If your "F/A [sic]" (A/F) gauge is connected to a narrowband oxygen sensor, then yes, it's normal.
 
A narrowband comes with its own o2 sensor and is actually accurate/useful.
 
Not really sure.Its connected to my stock o2 sensor under my driverseat.there is another in my headers.which one is correct one?What difference between wide or narrow band?

If you paid under ~$75 for your gauge and you're using the stock sensor, it's a narrowband system. Both the stock upstream and downstream sensors are narrowband sensors.
 
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