Even if the car was running rich due to exhaust leak or other. They should not kill the o2's that quickly.

The only thing that would do that that quick is Contamination.

 

Contamination from what though? I am pretty sure that it is not a coolant leak as both my radiator and resivor are both full still. What else could it be?

 

I dug this up for ya...

Common failure modes
Lambda probes have a limited lifespan since the exposed sensor element is subjected to high temperatures which causes fatigue over time. Probes become sluggish, failing to react quickly to changes in the condition of the exhaust gases. This can be caused by contamination from the engine, fuel or additives. One common fault is silicon buildup on the probe sensor. A common source of silicon contamination is through the use of silicone sealant in repairing water system leaks. Lead build-up from the use of lead additives or leaded petrol will also damage the probe, as will carbon build-up from excessive burning of engine oil. Phosphorus in the burnt oil is also a specific damaging contaminant (but the phosphorus is part of a very beneficial additive called ZDDP which as of 2005 is yet to be replaced with a less 'damaging' (to the sensor or emissions equipment) yet equally effective (in protecting the motor life) substitute. It would be expected that a probe would last for 3 years or 40,000 miles (about 64,000 km), but it has been observed that probes will last for up to 3 times this length. [Also, oxygen sensors have been used successfully for 2 years of racing with leaded gas when the sensor is put into a non-leaded gas burning vehicle to 'burn' off the lead then putting it back, etc.

 

Same problems here, my mileage has been about 90 to 95 miles to the tank, more after new O2's. I plan on tearing the motor down this winter and go through everything(bad tranny now too, it couldn't handle the power) i.e. compression test, leak down, you get the idea

 

I have been having similar problems too I think my car is running a little rich, anyone ever figure out why this happens??? After about a month i start getting slow response codes form the o2 sensors

 

This seems to be a problem for quite a few people. Do you have headers?

 

yep i have hooker longtubes it was fine all last winter but I did get a header leak at the beginning of last summer, which i blamed for messing up the first pair but the leak has been since fixed but I am still going through o2s like crazy. The headers are black on the insides probably from running so rich for a long time so I think the next thing to try is to take the headers off and clean them up.

 

My headers are extremely black on the insides as well from running so rich. You don't happen to also have a 160 thermostat do you? I noticed a significant increase in my gas mileage when I put my stocker back in, but both my sensors were already giving the slow responce code before I changed the thermostat. I know running a cooler thermo will make the car run a lot richer...

 

I do have the 160 thermostat in it i had it in all last winter too why would the thermostat make it run richer???

 

I don't have any sort of article over it or anything, but from what Madwolf told me, having a cooler running engine makes it run richer. I'm not sure why it does that, just must be with the tuning and what fuel tables it uses for the given temperature. I really think it must effect some cars more than others because there have been plenty of cars running the cooler thermostata and not had any sort of problems or had their gas mileage effected, but when I changed back to my stock one, I noticed about 5 mpg increase on the highway.

 

It might be worth trying because I put it in the car since day one an my mpg has always seemed lower then what I have seen other ppl get

 

glad to see I'm not alone in this....but yes, a lower temp thermo will make you run richer.....

Ive got mine on the rack to put in the new torque arm (UMI....Looks Great!!),
and new torque converter. Then the compy will prolly go to madz28 for some tuning, and hopefully this will rid me of my problems.

Billy D.