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post #1 of 5 (permalink) Old 11-12-2012, 03:10 PM Thread Starter
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O2 Sensor and Engine Swap

I've used an 1994 LT-1 engine in my "LoCost 7" project car, everything is done, built, so now it's tuning and optimizing. There are two O2 sensors for this engine, my understanding is pre-cat and post-cat. I'm running the engine with headers to straight pipes down the left and right side of the car so there is no y-pipe. This means the O2 sensor can't get a read from both the left and right cylinder banks. I originally placed the precat O2 sensor on the left exhaust and the post-cat on the right exhaust but that's obviously not the way to do this.

If I just use a single O2 sensor and delete the post-cat sensor via a flash, then I'm only going to be reading half the engine, far from ideal but good enough? Is the only alternative to remove the O2 sensors complete and tune accordingly? There is absolutely no room to install a Y pipe, that's for sure.

Anyone have any suggestions here?

The attached pictures really have no purpose on the above question, I just thought you'd like to see the car and engine bay.
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post #2 of 5 (permalink) Old 11-12-2012, 04:48 PM
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You should have two 02 sensors, and since its a 94, one per bank.

Not one pre cat and one post. So un-delete the one, and swap it to the other side. Should be good to go then.

Car looks sweet btw!

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post #3 of 5 (permalink) Old 11-12-2012, 06:22 PM Thread Starter
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Quote:
Originally Posted by ShowNoMercy View Post
You should have two 02 sensors, and since its a 94, one per bank.

Not one pre cat and one post. So un-delete the one, and swap it to the other side. Should be good to go then.

Car looks sweet btw!

Ah, cool, Thx. Must have read the pre post thing somewhere and misunderstood. So I have it right, just might have them backwards.
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post #4 of 5 (permalink) Old 11-12-2012, 08:54 PM
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Quote:
Originally Posted by ShowNoMercy View Post
You should have two 02 sensors, and since its a 94, one per bank.

Not one pre cat and one post. So un-delete the one, and swap it to the other side. Should be good to go then.

Car looks sweet btw!
Yes, each bank/side has a O2 sensor. But there where camaro's with the before and after cat O2's - though i don't recall which years.


FYI the O2's take special wire and connectors otherwise the loop resistance will change and the PCM will read an incorrect signal - close but not correct. What i'm saying is use the stock wiring harness - not off the shelf wiring for the sensors to the PCM.

Mann thats a cool project car Paul.

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post #5 of 5 (permalink) Old 11-12-2012, 09:04 PM Thread Starter
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Quote:
Originally Posted by cardo0 View Post
Yes, each bank/side has a O2 sensor. But there where camaro's with the before and after cat O2's - though i don't recall which years.


FYI the O2's take special wire and connectors otherwise the loop resistance will change and the PCM will read an incorrect signal - close but not correct. What i'm saying is use the stock wiring harness - not off the shelf wiring for the sensors to the PCM.

Mann thats a cool project car Paul.

cardo
Using a harness that has all factory connectors, so not worried about reversing it. I have now just have to make sure I gave them on the correct side.

Thanks for the comments on the car, and it's a blast even if it isn't running well. Can't wait until spring!
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