Hi everyone, I need help, I´m making an engine swap to my 92 RS, I´m mounting a LS1, but I have a problema with the O2 sensors, the arness have four O2 sensors, but I want to know if is posible to jump or just not to connect the sensors, and if that action will affect the correct function of the engine, or it will be a problem with the HP´s, I hope you can help me, and understand what I´m trying to tell you, thanks for all.

 

I believe the rear O2 sensors can be deleted with a custom tune in the PCM
(which you are going to need anyway with a retro swap )

 

Yup just cut off the rear o2's and have them tuned out OR buy o2 simulators so the PCM thinks they are in place.

They will be wired as Bank 1 oxygen sensor 2, and Bank 2 oxygen sensor 2.

Jay

 

It sounds like you're using the fbody harness mostly intact, so instead of cutting anything off, simply repin the fronts to rears as the front harness is too short for a conversion into a 3rd gen. Even swaps with manifolds must move the front O2s down the y-pipe

 

Good Idea,glad I seen this B4 I started on my wire!!

Thanks

 

and what will happen with the now front, (before rear O2) I just let it disconnect or cut off, so somebody told me that it was necessary a new tune up to the PCM, so it si posible to made it on the dealer or where, cause here in mexico is a Little hard to find a place where to do it., thanks for your help.

 

Order a tuning package and DIY

The old fronts are no longer necessary. Do whatever you want with them. I'd zip tie them out of the way vs cutting them off. I'm not a fan of leaving 12v wires free floating ESP in the vicinity of a ground wire that's also loose

 

http://www.lt1swap.com/vortec_o2_sensors.htm

Heres the link to the O2 types and wiring differences