Ok, I have a DC sports 4-2-1 header so no cat, then I only have one O2 sensor. I went to vatozone today to get a new one just for ***** and giggles while the motor is out and he asked If I wanted the one before or after the cat. Well I didn't know which one I would need, I would ASSUME the one before, but I wasn't sure. When I told him about the no cat thing and how hella JDM it is (joking) and he said it would be better to just not run one. He said I would get better MPG and HP. Now I'm no genius, but ****... this sounds WAY wrong. I have plenty of O2 bung plugs, so blocking it is no issue, and I would rather not run it if I don't have to because I would like to use that bung for my wideband, but if I need to run it I will. So what all do you guys think, and yeah, I know I'm going to have to run the O2 sensor, well at least 99% sure, lol.

 

Just another idiot reinforcing why you should never trust anyone at AutoWeDontKnowShitZone.

 

Amen to that.
In other words. Run the o2 b4 the cat that you dnt have. I've seen a lot of people plug the second one though.

 

Well I don't have a 2nd bung, that was throwing me off, and the one I do have is where I would normally have the 2nd one, it's behind the motor straight below the intake manifold.

 

What vehicle, including year and model?

What engine, including code, year, and model?

What ECU, including year?

 

vehicle? eg hatch, 94 dx
engine? H23A1
ECU? P14

 

How else would you get accurate air/fuel ratios?

The autozone person is a total moron, OBD1 motors only have 1 O2 sensor, don't buy the other one thinking it'll work either because it's different.

 

Where do I find the engine code to find out what year car my motor came out of? I have just been buying 96 prelude parts, but honestly have no idea. I assume I am OBD1, but the 96 and up are OBD2 right?

 

Yeah, the stamp should be on the block next to the starter and if it is a 96 year it would be the OBD2 H23a2.

 

so wat happens if you dont have a o2 sensor and just run the car that way ??

 

Negative. It's still an H23A1. The H23A2 is the nearly identical European version, offered from 1992 to 1996.

First, "what" has a ****ing H.
Second, your car will run like absolute ****.

I'm really not sure why you Civic owners do much of any of the crap you do, but this is at the top of the things that bug me.

Why would you even bother to give an incomplete chassis code as an answer to what vehicle you have? I'm not picking on you, just pointing out logic in a general sense. However, saying that you have an EG or EK is only as descriptive as saying "I have a Civic from the 90s". Just for the EG range of codes, there are like 25 different motors available across the B and D series. The body styles also vary between 3D and 4D.

Have you ever asked a Prelude owner what they drive and the response was "BB"? That alone would be way more descriptive than simply "EG", even though "BB" spans two very different generations of Preludes. That's because the Prelude only comes in one body configuration (coupe) and only a few motor options. Do you see what I'm saying?

Anyway, carry on.

 

You can run without an o2 sensor. I did it for awhile you get shitty gas mileage and your car is running at a set variable all the time.

Its inefficient really.

 

In a nutshell, the fuel injection system never leaves open loop and the ECU just uses the default fuel table values - so it runs way too rich, gets poor fuel mileage, and loses power.

 

when i tune, i leave the cars in open loop by turning the o2 sensors off. Just something in the background effing with my tune

 

Well my civic came with a 1.6 liter v-tec motor, but the v-tec was wired straight to the p-28 ECU he had in it. I don't think it came in it though, more than likely it came with the 1.5, but I'm not really sure. I have only had a civic for a few weeks now

 

im running without an o2 sensor...but i need to change that lol

 

The VIN number will tell you.

 

Will post it up tomorrow

 

a tuner told me he can chip my ecu and do without the o2, car would run better than if I didn't have one

 

Why dont you hand your car keys over to a thief aswell.

 

What can anyone do with my vin? I already swapped my ign. and door locks

 

Just post the first 11 characters. The final 6 are the only characters unique to your vehicle.

 

Nice! Good return haha

 

Who took the jammer out of your donut?

Trolling should at least involve some useful info.

As for the topic of the thread, running without an o2 sensor is retarded. Your car would run like crap at partial throttle, any tuner or auto parts counter jockey who says otherwise needs a swift kick to the cherries.

 

all the cars i tune run without o2 sensors