I installed my ceramic coated Pacesetter LT's last weekend with the old O2's because I hear when the coating burns off, it can ruin the new sensors.

I've put 70 miles on the car so far.....how long until I can install the new O2's safely?? Thanks

 

why would the coating burn off? it's ceramic.

I've never heard of any need to wait, but I suppose it wouldn't hurt... especially if you used antiseize or RTV to connect everything. I'd personally just give it a few heat cycles (say a week or so of daily driving), and a good couple seconds each trip at high rpm's to cure eveything.

Honestly, shouldn't have any problems doing it straight out though.

 

Steve, there was a recent thread about lots of O2's mysteriously going out after new coated header install.

To answer the original question,
If those O2s are doing fine then why mess with a good thing?

 

They have 78k on them, I already bought new ones, and I think my car is running lean....

Is it safe to change them after a few driving trips (6-10)??

 

I would give it a few WOT blasts to really heat the headers up then change them if you are dead set on replacing them now.

 

Wait till you don't smell the header stink anymore. I smelled mine for a week or so.

 

I think you motor-heads are having o2's sensor issues from using conventional anti-seize paste on the 02 threads.

This can actually electrically insulate the sensor rendering it inoperative!

The threads should be coated with a special GM anti-seize compound (or equivalent) that consists of liquid graphite and glass beads. The graphite will burn away, but the glass beads will remain, making the sensor easier to remove.

GM Part # 12377953 (93-97 LT1)

 

I installed new O2s when I did my header install. No problems.

 

Does the common antiseize actually damage the O2, or can I wipe off the old stuff and replace it with the GM stuff and be o.k.

Dan

 

It could actually damage the O2 sensor.

 

Right on the package that the new O2's come in says "Do not apply any antiseize compound, it is already applied from the factory"



....just screw them in and go

 

Man, I totally missed that on the package. I bet that might be my problem. I have new O2's and used antisieze compound and have a slow response on one sensor. I wonder if that's my problem. I'll have to totally clean out my O2 threads and screw them back in and see if that fixes it.

Dan

 

Dan,

If you used regular anti-seize compound, I’m 99.9% sure that’s your problem.

After cleaning the threads, and applying the new special GM anti-seize compound, (or equivalent) it's still possible your 02 sensor's may operate normally.

Let us know if works.

Johnny

 

It's strange that it could make that big of a difference. I used Permatex Copper Anti-seize lubricant.

Do you have first hand experiance with this happening?

Dan