I have a 97 Civic LX with 96 JDM B18C swap and my guy that changed my wiring harness from a stock LX harness to a SOHC VTEC harness said the JDM Integra Type R doesn't utilize o2 sensors. He also said I wouldn't need to go to the exhaust shop to get a bung installed for my secondary o2 sensor. Is this true or am I hurting performance?? Do I need both o2 sensors hooked up?


thanks,
Jeremy

 

i dont know off the top of my head whether a 96 jdm b18c is obd 0, 1 or 2..


obd 0 is no o2 sensors.
obd 1 is one precat o2..
obd 2 is pre & post cat o2..

it isnt a matter of hurting performance, its a matter of getting that check engine light to go away so your car isnt running in limp mode..

 

Do not spread misinformation.

OBD0 does use oxygen sensors.

Last year for OBD0 was 1991.
Last year for OBD1 was 1995.
Last year for OBD2A/OBD2B was 2000 for Civic and 2001 for Integra.

A JDM B18C does have a primary O2 sensor.

 

jdm b18c uses o2 sensor

 

depends greatly on what ecu you are running for what you need now, 96 spec has one 02 sensor like its been said, stock your car had two.

 

I have the P73 ECU that came with my swap.

 

If its a jdm ecu you only need the one 02 sensor.

 

my bad..


i did know the 95 production split on obd 1 to obd 2...was the rest of the statement pretty much correct about how many sensors each system does use? or did you just want to point out a mistake?

 

The assume the one closest to the manifold is the one needed, correct?

 

when talking about o2 sensors, yes, if it only has 1 then it would be the precat which would be closer to the header if not on the bottom portion of said header.

 

Nope your wrong on your 02 numbers as well.

 

everyone is wrong, obd0 and obd 1 go back before any of these, not sure about the second generation lude, but the third generation accord carb was obd 0, 86-89, had one O2 sensor, carb computer could adjust mixture and had inputs and outputs, but no check engine light, the third generation accord FI cars I would consider obd1, as they have a check engine light and can give you diagnostic codes, but can't be connected to a scanner, the old watch the blinks on the ECU deal.

 

None of that info is new to me or makes anything I said wrong. I was raised on feedback carbs.

 

I was referring to someone saying they went back to 96, lots of people are surprised to learn the old Accords had ECUs

 

 

God damn. Who are you people? This is a simple *** question.

The JDM B18C doesn't care what sensors are there. The ECU does.

What ECU are you using? JDM ECU's and pre OBD2 ECU's don't require a SECONDARY O2 sensor.

 

I was referring to the comment about how far back the OBD 0 went, good old Honda ECU with no check engine light, and a bunch of electromechanical controls thrown in with a couple of sensors and an O2 sensor, good times

 

aww come on...i was having fun trying to learn...i knew prior to obd 2 had only precat, but i didnt know all the specifics..

next i was going to ask why my vehicle which is clearly obd 2 through production has 0 o2 sensors.. (hint: because thats the way it is set-up to run.)

 

Oh thank God someone in here makes some sense. OP Needs to explain which ECU he's using and weather or not it's stock or modified. A modified ECU can be made to look for whatever sensors you want.

To the OP: If your car still has the stock exhaust in place, it probably still has the secondary O2 sensor hooked up after the catalytic converter. From the mechanic's comments, it sounds like he didn't touch the exhaust at all. If he just plugged in the stock JDM ECU into your stock main harness, then it will JDM ECU will simply ignore this sensor.

If you ARE running the stock LX exhaust system, it will be choking your B18C and you will be loosing power. But that has nothing to do with the secondary o2 sensor. Stock ITR exhaust diameter is probably the minimum you want to run (something like 2.25" even for JDM). I have the JDM ITR cat and the exit side is definitely a smaller diameter than the 2.5" inlet side. This is why I guess it's probably about 2.25".

 

I already mentioned it was the P73 ECU that came with my swap.

 

Okay then YES it does look for an O2. Only the primary O2. This is the one near the end of your header just before the cat.

 

The primary O2 sensor is the only one that the JDM ECU looks for. Even Jesus knows that.

 

 

that movie was ******* hilarious.

 

'96 JDM ITR ECU only uses the primary O2 sensor at the header. There is no secondary O2 but only a NTC Termistor in the cat (which is ******* useless).