air / fuel ratio swinging

[accel]

I switched to air fuel ratio gauge recently while driving at freeway, constant speed, constant load.

'17 gt pp, stock except catback... 87 fuel.

afr needle is swinging back and forth between 13.5 and 14.5, pretty much like a pendulum.

The car has no issues... maybe idle got a little rougher recently, but not very obviously.

Just checking if this is normal or not, and if not - what normal is.

Overall afr needle is a little erratic pretty much everywhere, but as I said, if I did not see thiegauge, maybe I would not be worried.

Sponsored

 

[GT Pony]

I don't recall seeing my A/F gauge swing that much at a constant load and speed cruise.

 

[kluke15]

mine seems to go back and forth. i dont think the gauges on the dash are super accurate. if i do any data logging the afr is pretty steady while the dash gauge is like yours

Sponsored