wagovanb16man

Alright I finally found a header that has two 02 sensors, one of them is on the header, and one is on the down pipe near the cat. I was wondering how to move the 02 sensor down by the cat, and which one I should move.

Should I move the 02 sensor with the green plug or the 02 sensor with the yellowish/clearish plug?

How do I go about doing that? Standard wire connected to the 02 wire?

AHHVTEC

first what car do you have with what motor in it.

wagovanb16man

It's in the signature, but oh well..

90 Civic Wagon, JDM B16a, OBD-0..

B16RacerN2NR

You can't have one at the down pipe... it'll run kinda like shit

Tech - Closed Loop scroll down to wear it says pre-obd engines.

Citizen_Insane

You have to have one O2 monitoring cylinders 1&2, the other monitoring 3&4. You'll need a 4-2-1 header with an O2 at each secondary if you want to run it as stock.

wagovanb16man

Well, only one 02 sensor monitors the #1 cylinder..
This is like this on all aftermarket headers..

Even if I relocate the 02 bung to the #2 cylinder, it still wouldn't monitor 2and3..

The only way to have them monitor 1and 2, or 3 and 4 is weld bungs on the downpipe before it goes into 1.

Any input?

91_civic_si

I got lucky and got a original rsr from hmotors last week that is made for the obd0 b16. Only cost 180 shipped to Alaska.

invisibledemon

take it to an exhaust shop and have another bung welded into the 2nd cylinder.

problem solved.

wagovanb16man

I could do that but exhaust shops are expensive.. I've been thinking about taking a nut that matches the threads of the 02 sensor and welding it to the piping and then drilling the hole.. Would that work?

Would it work if I moved both 02 sensors to the downpipe before it goes into 1? I think that would look a lot cleaner especially if I got a header with now 02 bungs..

invisibledemon

if an exhaust shop trys to charge more than 30 to do that. then they should be stabbed in the eye with a rusty hanger.

whats 20 or 30 bucks to have it done correctly?
what part of tn are you in?

AHHVTEC

if you have two o2 sensors and the header has two bungs then whats the problem

invisibledemon

obd0. its not a primary and secondary.
one runs 2 cylinders and the other runs the other two.
if he put one in each bung that he currently has, one will read correctly while the second is reading for all four cylinders.

AHHVTEC

got ya...yea just go have it done at a muffler shop

invisibledemon

or buy a different header --- pretty pricey
convert to obd1- ----------- pretty pricey
go to a muffler shop------- cheapest way to do it correctly.

wagovanb16man

Correct. But the way the 4-2-1 header is designed there is no way to monitor two cylinders at one time. Only one.

Only way I see to do it is have the 02 sensors at the downpipe before is goes into one pipe.

It seems like it would work like stock, just slightly different..

But I would have to add wire to my O2 sensors, can I do that like any other wire? Just solder it in?

I'm in west TN, Lexington to be exact.. About 1-2 hours from Nashville, depending on what part you are going to.

__________________
90 Wagovan SiR
-Lots of stuff done to it.

-Lots of EF/EE parts for sale, PM me!

HATCHET_HONDA

hmmm...i wasnt aware a b16 has 2 o2 sensors..obd0? my p28 is obd1 and i only have one o2..learn somethin new everday i guess

wagovanb16man

Yeah but OBD-1 has a 4-wire 02 sensor..

Though I think it's only B16s that have two 02 sensors. The OBD-0 D series have 1 02 sensor.

B

you got a header for a 99 civic si basically. it's not going to work.

this is what you want:



1/4 and 2/3 wired to the right port on the ecu.

1/2 & 3/4 as stated above is WRONG

Attached Thumbnails

 

wagovanb16man

I didn't order that one I posted, it was just a reference.

That looks like a stock header.

As I said before, I think if I put the 02 sensors where the downpipe meet the header before it goes into one, I think it would work.

91_civic_si

Not trying to talk bad but you should get the appropriate header and weld the bungs on correctly or just keep your eye out for a used rsr obd0 b16 header. If you keep looking on hmotors then you might see one within 3 or 4 months.

B

its been done, and it runs like shit. expect a 20-30 hp loss.

the o2 runs in pulse, 1/4 and 2/3 send out exhaust pules at the same time that its o2 sensor 'turns on' and looks for metering.

wagovanb16man

I still don't think you guys are understanding me. Aftermarket 4-2-1 headers have the pipe seperated all the way till they go into 2, which is two pipes till it meets the cat.

As you see in this picture the pipes are pie cutted and welded together, so there is no way to monitor two cylinders at one time unless the 02 sensors are moved lower..
If you look closely you can see it.


I'm talking about moving the 02 sensors down to this area of the piping. It's the same thing just lower.

__________________
90 Wagovan SiR
-Lots of stuff done to it.

-Lots of EF/EE parts for sale, PM me!

invisibledemon

ok so you can do it two ways.
example number 1: you can put another bung into cylinder 2. you dont have to have one in every cylinder. one of mine is ran like that. one in cylinder four, and one in cylinder two.

example number 2: you can close the existing bungs that you have. and weld new bungs in each of pipes. where it turns to two.

thanks B for clearing that up, i thought it was wrong but couldnt rememebr at all what the correct way was.

but thats how you can run it. i have two b16 swapped ef's, one is ran like example number two. runs great.
the other i spliced into one single sensor. it runs rich, idles high, and like b said, lacks power.



edit: fucking bmp pic cant load. wait. never mind on the pic.

__________________

invisibledemon

how do you paste the pics directly into the post with out having to host them?

wagovanb16man

I don't think you can..

Just make an account on Photobucket, it's free..


Shot in the dark:
Did you just sell a B16 hatch not too long ago?