running a y8 header but the o2 bung is at the collector. im still obdo so im wondering before i go spend money to have a o2 bung placed at the runner if it will be fine at the collector. will it cause issues since its a non heated type sensor.

 

Its gonna give u cel for o2 im having the same issue right now

It will come on when going down hill

Or when motors at low rpms

 

Also how much.are you thinking its.gonna.cost

 

661rex89si.....awesome profile pic. And KingVem I assume you're running OBD 0 yourself. I have a DC header I've been waiting to install and the o2 is in the middle of the downpipe right before the cat. You're saying I would throw the o2 code because of it's position? I've heard of this issue but have had no personal experience and havent read up on it....also have been worried this would be the case.

 

With a single wire O2 sensor (non-heated) it must be within around ~12" or closer (non-scientific) from the cylinder head to function properly. It relies on the exhaust gases to heat itself to get a proper reading. The downside is typically only one or two cylinders can be monitored. When a 4 wire O2 sensor (or 3 wire for that matter - (heated)) is used it can be placed further downstream to get a more accurate reading of the overall Air Fuel Ratio from all the cylinders on that bank. So you can see which is preferred... I have posted many times about how to wire up either or in other threads to work while still running OBD-0...

https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/4-wire-o2-obd0-3027163/

Actually, pretty much all of your questions should be answered in there. If you have more, I can always help you further.

 

Thanks man......that is exactly the info and details I've always wanted to learn. I knew the o2 had to be close but never knew why and how far was TOO far. And thanks for the link, I'm gonna check it out now.

 

That was a FAN-****IN'-TASTIC write up....."Nevereversatisfied".....I put it in my favorites on my computer. Definitely gonna go that route before I install my headers and full exhaust.