What sensors handle air/fuel mixture?

[missouritig]

2000 k3500 5.7 4x4

I remember reading something about o2 sensors not really factoring into air/fuel adjustments, maybe from cold start only?

Im running very rich after engine temps increase. Idle speed seems good, but exhaust is really wet and steamy and smells a little fuelish.

Can anyone recall for me what sensors handle the fuel delivery and air mixture from startup to engine getting warm?

 

[Supercharged111]

What voltages do your O2 sensors show when warm? MAP, ECT, IAT, RPM, TPS all contribute to AFR and I'm probably missing something. O2 trims the mixture once you hit a certain temp. Smell to the untrained nose can be rich, lean, or completely normal.

 

[missouritig]

These are kind of old but I believe its idle at stop and then giving it a little gas and letting off real quick (MAF rise)

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[missouritig]

I checked the sensors again today, i think I might just leave it as it is. No codes being thrown from idle and I can turn off then restart without stalling or throwing codes. Thats mostly due to me solving a vacuum leak. Here are some of the voltages from engine warm at idle, with me giving it a little gas as the MAF rises.

 

[missouritig]

these are snapshots at idle O2 Sensor 1 is kind of wild

 

[Supercharged111]

Your sensors are fluctuating and seem to level back off near .5V after you lift. I'm guessing this is just a rev in the driveway? A snapshot is just that, so I wouldn't think twice about those.

 

[missouritig]

Your sensors are fluctuating and seem to level back off near .5V after you lift. I'm guessing this is just a rev in the driveway? A snapshot is just that, so I wouldn't think twice about those.

Correct, it is stationary. Ive got the front suspension in process of being replaced

 

[Schurkey]

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Is the scale at the bottom in seconds?

So from 20 to 50 seconds (30 seconds) the O2 voltage hardly ever swings past 0.45 volts? You're showing 4 crosses in that time. If this is REAL, you probably need a new O2 sensor--this one is old and lazy. If this is an artifact of the scan tool you're using, you need a different scan tool.

That voltage should be swinging MUCH faster than that. I'd expect double-digit cross-counts. Not "4" but forty, perhaps.