Hello, Im new to the forums as of a few weeks ago. I recently purchased a 2000 Blazer, 4wd 2 door vortec v6 engine yada yada. Ive experienced plenty of problems that were resolved simply by searching the depths of the site. However....


Today I purchased a new o2 sensor, and went home to put it in. Right from the start, Im having trouble getting the old one out, so I cut the wires on it and proceeded to come at it with a deep socket that fit. I pushed and pushed trying to break it free and I felt a little give. feeling relieved, I began taking a closer look, the sensor had not broken free, but the circle cast iron plating type thing it looks like its attatched to, has cracked, as the force of me pushing the ratchet only put pressure on the area. so now my question is, what do I do? can I continue to drive it this way? should I JB weld the area? and still wondering, how do I get the old sensor out?

 

Gotta get it cherry red first, then unscrew the old sensor. You'll need to use acetylene/oxygen. The piece that the sensor screws into is called a "bung". It will need to be mig welded after you remove the old sensor. Then re-thread it and install the new sensor. JB Weld does a lot of things, but repairing a 2000 degree converter is one of them

 

I believe the Captain meant "...isn't one of them."

 

LMAO, yup, good catch! Thanks!

 

Wanted to add to this with removing the collector bolts. Do I get them red hot first then remove them?

 

Yup, gotta be glowing completely red. Even then they might give you a battle... or break off

 

I`ve always used a mapp gas torch just takes a bit longer to heat up. Just saying

 

so where is this sensor???

 

What I have done is spray it with penetrating oil for a few days before I try and if it breaks free run the truck until the exhaust heats up then let it cool until you can work on it but not stone cold and see if it comes out.. Forget to mention tapping the bung with a hammer help the oil work it's way in.

Also an O2 sensor socket and a breaker bar are helpful

 

Make sure that you use a proper wrench or socket that surrounds the nut near the base. Other things to try are PB Blaster, heat, cold freeze spray, wacking the wrench with a hammer a few times (not too hard) and tightening first before going the other way.