LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Help with o2 sensor removal...

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Old 11-18-2007, 07:37 PM
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Default Help with o2 sensor removal...

As a part of my continued restoration, I purchased some new o2 sensors this weekend. The car is a 95 formula, so it has two upstream sensors. The driver's side was a piece of cake, but the passenger side has turned into a job in itself.

What I have tried:

1. Adjustable wrench. Multiple angles, flipping the wrench, no go.
2. Unbolted the starter for more room. Helped to get more leverage, but still, no go.
3. Using a screwdriver with the above wrench, for more leverage, no go.
4. Went out and bought an o2 sensor socket. Used a breaker bar, no go.
5. Used a metal bar (somewhat flimsy, didn't help a lot, but helped apply more torque) No go.
6. Started the engine, let it run up to operating temperature. Shut the engine off, let the pipes cool down a little, since their is a lot of exhaust in the way. Didn't seem to help.

I can't get this thing to budge. It's almost like it was welded in. (it's not by the way)

Any ideas or tips?
Old 11-18-2007, 09:14 PM
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pb blaster it like 5x a day for a day or two itll come loose
Old 11-18-2007, 10:06 PM
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The easiest way is to cut it off so you can fit a deep socket over it.
Old 11-18-2007, 10:07 PM
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Go to an autostore and rent an O2 socket it makes your life waaaay easier. Had the same problem with you and tried everything then i got that o2 sensor and got it off in 30 seconds. haha get one
Old 11-18-2007, 11:32 PM
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Hit it with some PB Blaster and cut the wires so you can use a socket for it. Took me like 20 seconds to get it out after that.
Old 11-19-2007, 08:17 AM
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OK, how about everyone READ what I wrote about what I've tried, think about it a little bit, THEN respond. Geez.
Old 11-19-2007, 08:52 AM
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Did you spray the hell out of it with PB Lube, or Liquid Wrech, or WD-40. Do that and let it soak for about a hour. then attempt to get it out and give some more spray too. It is the rust that is holding it...
Old 11-19-2007, 10:44 AM
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Yeah, thanks 7901ws6, that's what I'm going to try next. Other than that, I'll have to take it to a exhaust shop I think. If PB can't loosen it up, it'll have to be heated. I don't have the proper tools to do it. If I put much more torque on it than I am now, I'm afraid I'll damage the exhaust pipe or bung. Thanks for the help.
Old 11-19-2007, 12:04 PM
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I had a hard time getting one of mine off...used a torch and heated it up around the threads on the sensors and where it goes into the exhaust tube. Get it good and hot then hit it with a wrench....worked for me. Be aware where your fuel lines are when doing this.

Good Luck!




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