Hello All,

I have a question regarding oxygen sensors. I bought me a new exhaust manifold, but it has only one hole for sensor. Actually my B16A1 has two connected to serial manifold, so my question is which on to connect and which not. And, will there be any problem with the ECU, if one is disconnected for all..

Thanks for help.

Trimcz

 

are you running a chipped ecu??

 

Why are you running 2 sensors?

 

Because he wants the car to run properly?

I'm assuming you mean a first gen B16? If so you should just get another bung welded in the proper spot on your header. Another option is getting your ECU chipped but just doing it right is probably easier.

 

Yeah, on the first gen. (B16A) it has two sensors on the manifold, just have another one welded on where it is on your original manifold. B16A1 is second gen (92-95) that runs only one.

 

I was under the impression only OBD2 systems used 2 O2 sensors.

 

The first gen B16 uses 2 one wire sensors.

 

 

Yes, I have old B16A1. Thanks for help

 

neato

 

The O2 sensors MUST be in the proper place in order for your engine to run correctly. Each 1 samples from certain cylinder pairs and will adjust A/F ratios accordingly.

You CANNOT run both wires to 1 O2. Your engine will either run too rich or too lean.
You CANNOT run 1 O2 without chipping the ECU(not advised).

On a stock ECU run the o2 sensors as they were designed to run sampling the correct cylinder pairs.

 

OBD2 uses 1 pre cat O2 sensor to monitor and adjust A/F ratio. And 1 post(after) cat O2 to monitor Catalytic converter efficiency.

 

Just a one more question. Maybe gringo can asnwer this.. So I need to weld oxygen sensors the way its on your first picture? On original manifold it goes on 2 + 2 pipes, similar to your second your picture. Does it actually matters where are they located on the manifold?

 

I believe the picture is a bit misleading. 1 O2 must sample cyl.1/4 the other cyl.2/3.

 

Becease 2wire o2 is not heated its important to mount sensor near head.

 

So, here is my manifold..




Can I place them to location where I made red dots?? Or do they actually have to take sample from each pair of cylinders?? This is important I believe.

 

Unfortunately no you cannot. That manifold really can't be used and have the system work as it was designed. You can run them wherever you want but it wont wrk correctly. You will run too rich or too lean.

 

Why not mount the o2 sensors back at the collector on the new manifold? you will still need to have your ecu chipped adn get it tuned if you want it to run properly. i've seen it done many many many times mounted at the collector but you will have to elongate the wires.

 

Chip your ecu to run BRE and disable the secondary O2 sensor.