Air fuel ratio gauge, is this normal ?????

[Bad Saleen]

When i run on the highway at 60 mph the light from the gauge dont stop to go up and down it s goes from 2 light in the red to the end of the green light in the rich is this normal and when i floor it it goes in the rich section 3 green light from the bottom, does my air fuel mix is ok

let me know

 

[fiveotony]

ok at wide open throttle it should peg out on the rich. When you are cruising it should move back and forth all the time at least mine does. If it starts moving very slowly from rich to lean or lean to rich your O2 is probably bad.

 

[Bad Saleen]

exactly what mine does i pop right 3 square inside the green and when im cruising it dont move slowly, the movement is fast

 

[Ferocity02]

The PCM is constantly trying to maintain a perfect 14.7:1 A/F ratio. But it keeps overshooting so it bounces back and forth all the time, and it should. A/F gauges are only accurate at WOT though, and since they dont have any numbers on them, they can only be used to detect major changes in A/F as a result of tuning or mods.

 

[mo_dingo]

The PCM is constantly trying to maintain a perfect 14.7:1 A/F ratio. But it keeps overshooting so it bounces back and forth all the time, and it should. A/F gauges are only accurate at WOT though, and since they dont have any numbers on them, they can only be used to detect major changes in A/F as a result of tuning or mods.

Exactly. It's like a sine/cosine wave. Always oscillating between rich and lean during part throttle, with 14.7 as it's "mean".

I can't comment on how "quickly" the needle would go back and forth. But this is a sign that the O2's are doing their job.
Scott

 

[HISSIN50]

the o2's pulse several times a second.

 

[stang_gt_1994]

Pules between 350mV-750mV @ closed loop.