C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

O2 sensor changing what;s the big deal?

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Old Dec 27, 2019 | 02:10 PM
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Default O2 sensor changing what;s the big deal?

Maybe it's year specific, and the 92's are just easier, but I went under the car loaded for bear.
Read all sorts of posts about having to get at them from above using multiple extensions and universals.

The wire can be a little annoying but I spent 20 years fixing aircraft so I'm used to that.

So when i was done I had used one ratchet.and one O2 wrench.
The ratchet is from Lowe's the O2 wrench from harbor freight.

Is there something on other years that gets in the way?




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Old Dec 27, 2019 | 07:05 PM
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I ended up paying someone to do mine when I had some other work done on the car. Biggest issue I had was getting the car high enough to get underneath it and have room for arm movement. I'm getting old enough I'd rather pay someone at times to do things like this than getting under a car.
Also some times the connectors give out due to age so that may need replacement also.

Last edited by hcbph; Dec 27, 2019 at 07:06 PM.
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Old Dec 27, 2019 | 07:12 PM
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People just don’t use the right tools.
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Old Dec 27, 2019 | 09:06 PM
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Originally Posted by hcbph
I ended up paying someone to do mine when I had some other work done on the car. Biggest issue I had was getting the car high enough to get underneath it and have room for arm movement. I'm getting old enough I'd rather pay someone at times to do things like this than getting under a car.
Also some times the connectors give out due to age so that may need replacement also.
I did mine on jack stands, but can certainly understand age. I did brakes on My MDX and my back was killing me by the end of what should have been an easy project.
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Old Dec 27, 2019 | 09:11 PM
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My 84 was pretty easy but I'd bet the later cars have it in a different location. I used a normal open ended wrench on mine...
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Old Dec 27, 2019 | 09:45 PM
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Originally Posted by 84 4+3
My 84 was pretty easy but I'd bet the later cars have it in a different location. I used a normal open ended wrench on mine...
I think it was 86 when they moved to two cats up by the block. so they are kind of in the way.
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Old Dec 28, 2019 | 03:35 AM
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Originally Posted by belairbrian
I think it was 86 when they moved to two cats up by the block. so they are kind of in the way.
that sounds about right.
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Old Dec 28, 2019 | 05:24 AM
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Originally Posted by belairbrian
I did mine on jack stands, but can certainly understand age. I did brakes on My MDX and my back was killing me by the end of what should have been an easy project.
Yup, some times it's false economy to DIY especially when you add in the doctor and chiropractor bills on top of everything else. That doesn't even include the down time when you can't enjoy the car due to the pain. Personally I think every Vette should come with a lift and a garage big enough to handle it :-)
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Old Dec 29, 2019 | 02:18 PM
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I've found heating it with a torch and then Qenching it with cold water and then removing it with a wrench no issues whatsoever....
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Old Dec 29, 2019 | 02:49 PM
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Originally Posted by belairbrian
I think it was 86 when they moved to two cats up by the block. so they are kind of in the way.
Doesn't it only have 1 sensor? What would be blocking it? I'm not sure since I don't have the stock configuration. Also I find that when you replace the sensor often enough, it won't be such a pain to remove. I toss my sensor every 5 or so years.
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Old Dec 29, 2019 | 07:23 PM
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Leverage is the biggest issue. I did mine without any jack stands or anything last spring. It sucked but was doable.

exhaust can always be tough cause of the heat involved. Heating and a crows foot or o2 socket always help.

tapping the threads and using copper anti seize will never hurt for next time.
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Old Dec 29, 2019 | 07:37 PM
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It depends on application. Corvette SBC isn't terrible. Iron manifolds are normally better than tubular one. The threads of the O2 sensor can seize to manifold and make for a bad day. It a good idea to put a dab of anti-seize on O2 sensor threads anytime you have it out.
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Old Dec 29, 2019 | 07:48 PM
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Originally Posted by Kevova
It depends on application. Corvette SBC isn't terrible. Iron manifolds are normally better than tubular one. The threads of the O2 sensor can seize to manifold and make for a bad day. It a good idea to put a dab of anti-seize on O2 sensor threads anytime you have it out.
I'm sure most have it on the threads, at least with Bosch
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Old Dec 31, 2019 | 03:49 PM
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Originally Posted by aklim
Doesn't it only have 1 sensor? What would be blocking it? I'm not sure since I don't have the stock configuration. Also I find that when you replace the sensor often enough, it won't be such a pain to remove. I toss my sensor every 5 or so years.
There is one per side on my 92. Since they are "upstream" you have the converter somewhat in the way. Earlier cars had the cat around midpoint of the car, so there should be more clearance.
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Old Dec 31, 2019 | 03:51 PM
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Originally Posted by aklim
I'm sure most have it on the threads, at least with Bosch
The AC Delcos do as well. I think I bought a Denso once (for one of the Hondas) and the paste was in a little squeeze pack, but it was there.
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Old Dec 31, 2019 | 03:57 PM
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Originally Posted by belairbrian
There is one per side on my 92. Since they are "upstream" you have the converter somewhat in the way. Earlier cars had the cat around midpoint of the car, so there should be more clearance.
My bad, for some reason I thought you were 87.
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