Normal O2 Readings

[shift_racer]

I just got a logger and have been messing around with it for the last week or so. It seems though that my O2 readings might be wack. Example - when I am coasting with the car in gear TPS reads 0 and the O2v also reads 0.00. Than when I'm just driving around town on partial, but constant, throttle the O2 is jumping all over the place it goes from .82 to .65 to .10 to .95 I mean really irratic. I was just needed to know, before I throw down 60-70 bucks for an O2 sensor, if this is normal and it should just climb and top out at .95 when you are full throttle.

Thanks in advance

 

[perley03]

your 02 sensor will go from lean (lower voltage) to rich (higher voltage) numerous times per second. it is regulating the air/fuel mixture. it is hard to tune with a narrowband 02 because it is either rich or lean, you really dont know what mixture you are at. when you are coasting with no throttle your computer is not injecting very much fuel, just enough to keep it running, therefore your 02 voltage will drop because it is very lean. sounds like your 02 is fine to me, but this is just me $0.02 worth.

 

[shift_racer]

Great thats all I needed to know.

Thanks