what would be the best o2 sensor to tie into ,i am hooking up a lean cut off and it will work with the factory narrow band just not sure which one to use ? i have 4 of them two before the cats and two after ?

 

I believe it is the fronts as the rear O2's are to see how efficient the cats are.

For the lean and rich a/f cut-off to work I think you need to use a wideband O2 sensor but for the lean you may be ok with the stock ones.

 

i just checked my stock sensor they have 4 wires does any one know if these are wide band ? or narrow band . also i was mistakin i only have one after the cat . it too has 4 wires

 

they are just a heated 02 sensor. they have an open and closed loop cycle, the readout to the pcm is in Mv. The front sensors monitor lean/rich condition, and the rear monitor cat efficiency.

 

Dynotune (LS1Tech0 sponsor sells a lean cutoff switch

http://www.dynotunenitrous.com/store...p?idproduct=67