A little off the subject but where would i find new o2's and how much do they run? thats if they need to be replaced. I am having the same problems that Critter is.

 

Shoebox has the part # for the correct AC/Delco sensors, and a recommended source:

http://shbox.com/1/Parts.htm

http://shbox.com/1/4th_gen_tech2.html#Dal_and_Jason

 

I sent it via email, it was a .uni file. Thank you.

 

also i got to thinking, i put ultra copper on my header gaskets. Both sides, let it cure for a day before i started the car. I have never had a header leak, but could the ultra copper be part of this problem? I was under the understanding that this was designed for exhaust gaskets.

 

Thank you Very much, my o2 is cheap!!

 

If you put to much ultra copper on the gasket and it came loose it could have hurt the sensors but probably went to the cat and stayed there. Look at it this way, if you buy the sensors and they were not the problem then you have a spare and the ability to swap them out if you ever suspect them to be bad. Sounds like one O2 works a little better than the other but both sound like there not working good enough to be of any help.

 

Cat lol, i took that thing off years ago, i drive a z28 you think i'm worried about the ozone layer?

 

 

To test the wiring to the O2s, look at the signal for each O2 while they are connected and in closed loop. Look for a side (hopefully not both) that is not swinging from say near 100 to 900 mv. Then disconnect the side with a problem and see if the voltage is now staying around 450mv. If the signal was near 450 before and after you disconnected the wiring, you have a break in the wiring.

If the signal was staying high even after you disconnected the O2, there are wires touching each other. And if it stays low, there are wires shorted to ground.

The next thing you can do is short the signal wires to ground to see if the readings go low. If not, like mine did, you have a definite break in the wiring. Mine was bad were it goes down the passenger inner fender and was over wrapped with foil. The wires were fried to a crisp. Incidentally, the wires for the starter and the KS were in that bundle.

To force the signal low after disconnecting the O2s, simply put a jumper from the black wire, to the tan wire and the purple wire. If the numbers stay near 450, you know you have a break in a wire.