I have been reading all of the posts about O2 sensor placement for the first gen B16 using the PR3 or PW0 ecu's. I am not throwing any codes, but my car has ran crappy for years during normal driving (partial throttle), it spudders and seems like it is loading up or something. Anyway, I think this may be due to my 02's bieng by the cat instead of by the primaries like people say. I want to see where they are located on a stock manifold so I can copy it to see if it will fix the problem. Any comments or opinions are welcomed also if you think it might be a waste of time. Thanks.

 

 

Thanks for the pic. Now I know which O2 sensor is A and which is B, but now I need to know if anyone knows which one controls cylinder 1-3 and which controls 2-4. I assume that I would put one in the primary of 4 and the other in the primary of 3, but which one goes where?