Casperws6

i ran my cam untuned for a while and was running rich and messed up my o2's. i just got them replaced and codes deleted, would i need a retune in order to not run rich or would the computer adjust with the o2's? i'm not sure and don't wanna mess these o2's up. thanks

Deamon2002

iTrader: (3)

No you are going to need to get retuned or you'll burn up the new set of O2s.

LoudmouthLT1

iTrader: (2)

You WILL NOT need to be tuned. The O2 sensors detect oxygen in the exhaust stream and send a voltage signal back to the PCM depending on what they are reading. The PCM just takes in what the O2 is telling it so there is no need to go and adjust it for anything.

Casperws6

yeah hopefully i don't need to retune

Mtnm2

But the ECU can only pull so much fuel. The car is not ment to turn its self. It has to have some where to start then it adjust in small ammounts from there

Deamon2002

iTrader: (3)

Right, what Mtnm2 said. You should have gotten tuned right after the cam, because you were running rich. The computer can't compensate for things like an aggressive cam, and if it were able to you wouldn't have burned the O2s up in the first place. But because you didnt have a tune and were running rich it fouled out the O2s. Just replacing the O2s will not cure you tuning problem. if you don't want to keep replacing O2s and running rich, get a tune.

Casperws6

i'm not sure if you guys understand what i'm saying since you guys keep telling my to tune my car. my car IS TUNED its just that the o2 sensors went dead. now i got my new o2's put in, do i need to get it RETUNED? i just want to double check

LoudmouthLT1

iTrader: (2)

As long as it has been tuned for the car you will not need it retuned as I stated before. As long as you didn't add anything like bigger injectors or anything that hasn't been tuned in.

Mtnm2

If it was tuned correctly it should not have burned up the O2's. I would put it back on the dyno with a A/F just to be safe.

blkZ28spt

This is interesting. I am in the exact same situation. I had it tuned, then the O2 sensors went dead on me. THey probably weren't the greatest to begin with, but they died a few weeks after the tune. It runs perfectly fine so far as I can tell though. (with new, better O2's)

Casperws6

did you put OEM o2's or aftermarket ones? is your SES light going on? it is kinda funny how the same thing happened to us.

blkZ28spt

I used sensors made for the rear bank of the C5 corvettes. They are meant to be further from the engine which means they come with a wire long enough to negate extensions and don't throw low heat codes, etc associated with longtubes. Part #13111 from autozone, were only a few dollars more than stock replacement. Car an great immediately after swapping them in, and codes went away quickly as well. This was two weeks ago and it still runs well. (at least in relation to this, lol)

Deamon2002

iTrader: (3)

Whoops my mistake, I was under the impression that you have not had the car tuned for the cam. Then everyone is correct you won't need one if you are just replacing the O2s. But it is still odd that you burned the O2s, do you have access to a wide band O2? Mayeb they accidentally tuned it for 14 not 13. 13 is optimal for our cars correct?

blkZ28spt

I kind of wondered why my O2's went to **** weeks after the cam was tuned. But they had been on there all four years I owned the car, probably the stock ones by how they were so stuck in there. They also endured a few weeks of open headers a couple years back.

LoudmouthLT1

iTrader: (2)

Did you recently add headers too? Usually the coating burning off kills the O2s.

Casperws6

i probably burned them out by running untuned (rich at idle) for a couple of months, then i got my tune and then they went out. im not sure. but thanks for the advice

BrandonSS

iTrader: (1)

Ooooooooooooooooooooooooooohhhhh.. so THATS what caused mine to die after my Lts.

Casperws6

and yes i had just added the slp LT headers