Fouling o2s

[ZFreie]

Originally Posted by My84Z

Oil could ve valves seals but more then likely rings are having blow by check your tb see if oil is coming up through it also

Im saying the outside of the wires on the o2 were oil covered, same with the low oil sensor. Im saying there is a leak external to the engine and leaking onto the o2 wires and running down them to the connector its self.

I might not understand fully what your aiming at but is sounds like your saying there is so much oil in my exhaust gas that its getting pushed out through the o2 in the header and making the oil climb like 2 feet up the o2 wire?

[My84Z]

I didn't know u meant external since it's external it should have no affect on your o2 unless you have a bad connector

[84ta406]

The o2 should have a weather connector and the end where the wires go into the sensor itself should be sealed.

[SLP IROC-Z]

swap your front o2s and see if the problem follows the o2 sensor

[ZFreie]

Originally Posted by My84Z

I didn't know u meant external since it's external it should have no affect on your o2 unless you have a bad connector

Yes i was saying external sorry for the confusion, I'm not always the best at getting across what I mean. I haven't done a compression test yet but I've never had any smoke a wot or decel so I think my rings are still ok.

Originally Posted by SLP IROC-Z

swap your front o2s and see if the problem follows the o2 sensor

I data logged it again and watched it this time, drivers o2(bad one) never got above 120mv and bascially never moved from 100~ where as the passenger side would go from 1 to 950mv. I'm going switch them shortly and then datalog it again. If it follows it, should be a easy fix cause the o2s bad. If it doesn't follow it that means I have a lose or broken wire somewhere?

The car runs fine in open loop, runs like shit in closed loop for like 10 seconds and then goes back into open loop.

Again, thanks for all your help guys, means a lot to a newbie!

[84ta406]

Shouldnt you be around .450mV?

Being high like 950mV indicates really rich, while the other ~120mV indicates really lean.

I agree with Joe, swap the sensors and see if the problems stay in those banks. Would indicate other problems.

[ZFreie]

Originally Posted by 84ta406

Shouldnt you be around .450mV?

Being high like 950mV indicates really rich, while the other ~120mV indicates really lean.

I agree with Joe, swap the sensors and see if the problems stay in those banks. Would indicate other problems.

The passenger side o2 was sweeping faster then you know lol thats why I said it went that high and that low, cause those were min/max #s I saw. So it would seem the passenger side o2 is "working" but the drivers side HARDLY moved from the 100ish range which made me think its dead, so, Ill try switching the o2s and see what happens and go from there.

Stuffing my face atm, after I'm gonna go switch them around, so Ill have an update in like a hour or so.

[ZFreie]

Ok, switched sides and it followed it. So I'm gonna try replacing the bad o2 with a new one. I noticed something on the gm one, it has 5 wires going into the 02 but only 4 into the connector, the old one and replacement only have 4 on each end. Did the dealership give me the wrong part hence it failing? Ill take pics and post them up if it makes it easier.

[ZFreie]

Ok, replaced it with a new one, and its fine it seems. Now the o2s shouldn't stay still correct? they should jump around a lot? If they are meant be pretty stable readings something is up with my car cause they jump all over the place. Let me know what you guys think.