I'm thinking about relocating my O2 sensor from the collector of the drivers side header to the point where both driver's and passenger side headers meet in the Y-pipe(I have the Edelbrock TES system) for more accurate O2 readings from both sides of the engine which will hopefully give me a better mixture. Has anyone done this before? Is it worth doing?

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92' Camaro RS 305 TBI
Best 1/4 mile - 14.6 @ 96 mph w/NO NOS
Best 60' - 1.9 secs
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I am pretty sure it is very vital where the position of the o2 sensor is and if you move it might not have correct readings

 

I have heard and read that the number 5 cylinder exhaust pipe just befor the collector is where you should put the O2 sensor. Thhey say that the number 5 cylinder runs the leanest, so you will dump more fuel.
Also just before the collector it will definitley be hot enough exhaust.
(just what I've heard)

 

I never thought of it that way. You don't suppose that maybe I can splice another O2 sensor into the existing one and install it on the other header would you?



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92' Camaro RS 305 TBI
Best 1/4 mile - 14.6 @ 96 mph w/NO NOS
Best 60' - 1.9 secs
Check it out
https://www.thirdgen.org/rides/index.tgo?action=view&rideid=4860

 

You can move it to the collector as long as you put in a heated one.

No, you cannot join two O2 sensors into one. They would cancel each other out and the ECM would see a flat line. I've been trying to find a way to get the ECM to use two O2 sensors but I dont think its possible with our computers.


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1991 Camaro Z28
5.7L 5-Speed (originally 305)
317 RWHP, 418 RWTQ
13.23 @ 107.62 MPH
Southern California
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I think I'll leave it the way it is. Thanks fot the input guys.

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92' Camaro RS 305 TBI
Best 1/4 mile - 14.6 @ 96 mph w/NO NOS
Best 60' - 1.9 secs
Check it out
https://www.thirdgen.org/rides/index.tgo?action=view&rideid=4860

 

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92' Camaro RS 305 TBI
Best 1/4 mile - 14.6 @ 96 mph w/NO NOS
Best 60' - 1.9 secs
Check it out
https://www.thirdgen.org/rides/index.tgo?action=view&rideid=4860

 

It'll run with the O2 sensor in the Y-pipe, but as said before you NEED to use a 3-wire heater sensor.

There is really no difference in the operation, as far as I could tell. When my van was stock it was on the Y-pipe with a heated sensor, I moved it to the drivers side manifold because the ECM I use to run my 350 expects it to be there.

It acts funny on start-up. A heated O2 sensor takes about 10 seconds to fully warm up. A non-heated one takes a couple minutes so the ECM tries to go to closed loop but the CTS doesn't match. It makes for some wierd idling sometimes.

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'92 Astro 350 TBI Edelbrock intake, MSD 6AL, 3.42's, 2.5" exhaust, Flowmaster 40 2 chamber, B&M 2nd stage shift kit, 255 60 R15 tires on AR-727's

 

the reading would be more accurate, but as you move it away from the motor you will affect it's heat up cycle. the sensor has an operating temp range, if it is further from the motor the exhaust temp will have dropped by the time it hits it the sensor. also the time it takes teh exhaust to get there(yes i know it is only a fraction of a second) will cause a delay in the reaction of the computer.
over all it is a good idea bad idea thing. the only way to find out if it works is to try it.

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91 Camaro RS-LO3,Auto.
14.209@95.46mph
Best 60' 1.917
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I relocated mine (87 GN) about 4' further back from where oem was. Was already using a heated one. O2s at lean cruise dropped about 50mv. No enough to worry about.
Worked fine for me.
There is a corection table for how long the ecm expects to see a change when it *tests* the O2, but the numbers seem to be sloppy.
The TBIs are real forgiving in the O2 transistional times.

 

Like I said, it worked but it idled wierd sometimes.

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'92 Astro 350 TBI Edelbrock intake, MSD 6AL, 3.42's, 2.5" exhaust, Flowmaster 40 2 chamber, B&M 2nd stage shift kit, 255 60 R15 tires on AR-727's

 

I relocated mine to just behind the collector where the Y-pipe bolts to the header. It works great, but yes, it does idle strange sometimes. This could be due to something else. Oh, yeah, mine is a 4-wire heated sensor, too.

 

Did you notice a difference in fuel economy and power when you did that? How would you hook up the wires for the sensor? Hopefully the sensor comes with a diagram if its universal. What was the part number? Thanks.

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92' Camaro RS 305 TBI
Best 1/4 mile - 14.6 @ 96 mph w/NO NOS
Best 60' - 1.9 secs
Check it out
https://www.thirdgen.org/rides/index.tgo?action=view&rideid=4860