Ok when my 90 hb was in the shop getting the b16 they told me it had 2 o2 sensors and they just put on in and combinded the wires... then when they first started up the car they coundnt find out why my car was running bad... The shop finally said I need to go get the dx exhuast off and get exhaust put on, that was understandable since the dx is so restrictive for a b16 then get this they said my o2 sensor can not be at the regular spot. I have dc sports headers u know were the o2 whole is at on them down right before the cat.... They said in order for my JDM sir to run right, the o2 sensor has to be welded to my header! Up top 5 inches from the beginnin of the headers, right on a primary down tube. well I had that done and Im just curious has anybody else had to do this?

 

Here are some pictures of what I am talking about







Those 2 white wires in the last pic are my o2 wires connect so it would be just one o2 sensor

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by shadowstylz &raquo;</TD></TR><TR><TD CLASS="quote"> Im just curious has anybody else had to do this?</TD></TR></TABLE>

Yes, unless you buy a jdm header that already has the 2 spots for the 02 sensor you will need to weld in a bung for the 2nd 02 sensor.

 

no u dont under stand the third picture shows how they took the 2 o2sensors and cut one o2 sensor off and just tapped that wire into the other o2 sensor to make it one so all I have is one welded to the header and the normal bung spot is welded shut.

 

mine are both on the upper behind it pointing towards the block. and each o2 sensor controls 2 pistons each. stock manifold location at least. i ditched my DC header cuz of o2 sensor problems. on my DC they relocated it near the CAT. which totally made it run like ****.

i think ones heated? and ones not heateD?
no clue.

it supposed to control 2 pistons each o2 sensor. so having it on one plenum is improper, I THINK.


IF ITS PR3 u need 2 o2 sensors monitoring 2 pistons each.

 

whats the ecu code for a sir ecu?

 

i have a dc header on my b16a and i welding in another bung for the primary (secondary goes where your only one is) in the other section and i still get a o2 code ever once in a while but she runs strong and i get decent gas mileage 29mpg

 

If you are running the JDM PR3 or PWO ecu, you will need to run 2 single wire (non-heated) O2 sensors in the upper part of the header for it to work properly. They are NON heated, so that's why they must be up close near the head.

The ECU pin locations are C8 and C16. Usually its C8 that is empty. You will need to add a pin to this location.


This topic has been covered many, many, times.

I see you have used a new throttle cable......good job!! If you recently bought a new radiator, you should have bought a 90-93 Integra radiator instead for the B-series motor. It drops right in and the hose fittings are a perfect B-series match. ( I see hose clamps on the radiator, so I assume you still have the stock D series CRX/Civic radiator)

That will still work fine, but I always upgrade my customers to the 90-93 Teg radiator if they need one at the time of the swap. Just a little bit of advice.

To be honest, if it were me, I would just convert to OBD1 using a chipped P28 for DOHC VTEC or Hondata. Then you wouldnt have to deal with those nasty OBD0 distributors going out and you can use that DC header without modifying it.

OBD0 is fine, but there are so many advantages of going OBD1.