scul8r1990

My 91 si hatch has one o2 sensor. What do i do about the 2nd o2 sensor on the b16? The engine has the hasport wiring harness on it but id like to know if i need to get a special header or wire both o2 wires to one o2 sensor?

can anyone clear this up for me? lol

thanks!

coot_er

didn't you get a header with you engine?
were in ohio are you?

scul8r1990

im in medina ohio, it came with the stock manifold with 2 bungs at the upper half of the header. Looks like im gunna have to get 2 bungs wleded into whatever header i get? 99-00si?

coot_er

ya man thats what it did. im obd O. i happen to find a header that actually had no oxygen bungs in it but i just took it to the muffler shop and showed them were to weld the bungs. i just put them in the same spots they were on the stock header. I think there are a couple of ways to go around having two sensors but its either half asses or expensive so i just kept it with 2 sensors. still working on installing it though.

Crx Jimmy

i only use 1 sensor just connect the 2 wires together near the ecu, ive run like this for 2 years no problems or codes

crx-treme

i decided to keep both o2 (b16 in crxsi) i heard if u connect them together it runs fine no codes but runs rich. just make sure u get the bungs welded high enough to clear front crossmember. i didnt measure and i have 1/4 inch clearence! uhm yeah 00 civic si or 94 dels sol vtec get bungs welded in factory location, in the two collectors