Bad O2's?

[isak81]

I searched for info on how to test the O2 sensors and came up empty.
The vehicle has a rough idle and occasionally dies.
Can someone look at my log and see if they are shot.
And tell me how I can check them next time?

[Gregs]

I searched for info on how to test the O2 sensors and came up empty.
The vehicle has a rough idle and occasionally dies.
Can someone look at my log and see if they are shot.
And tell me how I can check them next time?

Yeah they look bad. To check them drive around with normal driving, no WOT and look at the voltage graphs. Should be about two cycles per second for good ones. You command a pretty rich mixture at wot, unless you're FI or nitrous i would lean out your fuel a bit. Watch that kr you're having, kr @ high rpm & high load = bad things.

[isak81]

This is the stock tune on my dad's tahoe. He doesn't want me to mess with it.
Just find out why it wont idle.

[Sid447]

The o2's look fine,

The idle problem is probably another issue.

(Losing a lot of power because of KR activity, maybe check for misfire).

[isak81]

We just replaced the spark plugs and wires.
The only code it's throwing is for the AC.

[yzriders182]

Try cleaning out the throttle body with carb cleaner and a tooth brush. Clean the maf with maf cleaner. Should solve it

[isak81]

Cleaned the throttlebody and reflashed the PCM fixed the problem.

[yzriders182]

Got ya idk why but on a lot of the 5.3l (assuming its a 5.3) I have ran in to with that issue just cleaning the throttle body will fix it.

[isak81]

Thanks! It is a 5.3