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

O2 sensors?

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Old Nov 11, 2011 | 02:12 PM
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JohnnyLT1Runner's Avatar
JohnnyLT1Runner
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Default O2 sensors?

1991 coupe.

I've got a code that says I'm running rich, I figure it's the O2's, makes sense because my mileage is down. I've read that there's only one, and also that there's two.
Can anyone confirm if it's one or two?

Sorry if this is an over asked question, the search function wont work for such a short query.

Last edited by JohnnyLT1Runner; Nov 11, 2011 at 02:24 PM.
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Old Nov 11, 2011 | 05:03 PM
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Originally Posted by JohnnyLT1Runner
1991 coupe.

I've got a code that says I'm running rich, I figure it's the O2's, makes sense because my mileage is down. I've read that there's only one, and also that there's two.
Can anyone confirm if it's one or two?

Sorry if this is an over asked question, the search function wont work for such a short query.
One on a '91. They added the second sensor when the LT1 came out.
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Old Nov 11, 2011 | 06:23 PM
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Only one, drivers side below where the manifold connects to the Front Y pipe. You'll see it.

They sometimes dont want to come out, so there is a specific tool made to get them out easier. It also helps to lube them with WD40 significantly, or to try it with the pipes very hot.
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Old Nov 11, 2011 | 07:29 PM
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Thanks guys, this clears up a lot.
I remember back when I put longtubes on my LT1 I couldn't get the O2's out. Had to clamp the exhaust in a vice and use a breaker bar. I doubt this will be any easier having to be under the car. But, at least it's only one.
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Old Nov 11, 2011 | 09:45 PM
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Originally Posted by vader86
Only one, drivers side below where the manifold connects to the Front Y pipe. You'll see it.

They sometimes dont want to come out, so there is a specific tool made to get them out easier. It also helps to lube them with WD40 significantly, or to try it with the pipes very hot.
Just run the car a few minutes before you even try.
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Old Nov 12, 2011 | 12:34 PM
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Default Forget WD 40.

Also, forget about WD 40. It was never designed to be a penetrating oil/lubricant. To free things up use a penetrating oil such as Aero Kroil. It was designed to free stuck parts and comes highly recommended by members of the Model T Club, who know rusted, stuck parts very well.
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