MEFI 4 How do I add o2 sensors

[nealcj8]

I have got a 06 LS2 and it uses the MEFI 4B for the ECM it is a MSD brand but they have sold out to Painless. I took it to Lane Culvar to have it tuned and he got it running good but he said he could do more with if I added 02 sensors. Does anybody have this same setup or somthing close that might could give me some insite on this I think the ramjet motors use this same setup. O-yea my harness has the plugs for the sensors but they just have like a blank plug in them to block them off.

 

[crawlin85cj]

Turnkey Engine Supply uses the MEFI4 and has an O2 option in the tuning. As I understand it they can alter the amount of partial throttle fuel trim as a result of the O2 reading. I use them in mine and it seems to help keep them cleaner running. Give Kolby a call, I'm sure he would be happy to set you up with what you need to get it sorted out.

 

[nealcj8]

Mine still runs a little rich even after it was tuned so I thought the 02 sensors might help that.

 

[crawlin85cj]

That is exactly why mine were added. The first motor I got from them did not use them and it was rich at idle and loaded up. I sent the ECM back and now it's great. Even my stroked LS2 runs reasonably clean at idle with them installed.

 

[Draco]

X

 

[nealcj8]

I will give turnkey a call maybe they can help me. I thought about changing over to a factory style ECM but I already have a racepack that hooks directly into what I already have.