This will be my last 02 questions for everyone . To make long story short, I bought a 96 civic DX with a JDM type R engine. Originally the stock DX engine has two 02 sensors one in a single exhaust port(or merge IM not sure) and the other is at the collector. The design of this header inludes the catatalytic convertor.

This is what the previous owner did with the JMD type R header. He put a bung on one of the exhaust port where the top mount heat shield sits. I think its on the 4 or 1 exhaust port. I knot sure which way to count, but its the far right toward the timing belt side. This 02 sensor is the a/f mix sensor and the other 02 sensor is placed at the collector. The one at the collector is supposedly for the cattalytic convertor. I know this because I unplugged the sensor from the collector and the car runs just fine. BTW this car have an OBI ECU, so the second sensor is not necessary.

Here is my questions, the a/f mixture is only based on one exhaust port instead of the merged from all four...is this bad? What can this cause the engine to do? I will be switching the sensors soon, but I just wonder how this effects the engine performance.

 

I would ASSUME that it would not gain an accurate reading of the A/F ratio, being in just one cylinder.

what if the other cylinders are off? You know what I am saying?

My idea would be to just put it in the collector at the end of the manifold... but I may be wrong anyways...

Would like to find out for sure.

 

I will definitely put it at the collector just like the way it should if it were in an actual ITR car. I was just curious what would happen in my case, since Ive never ran into any issue such as this before. Its just a good learning information, because I never thought about it. Anyone else??????