If AIR injects air into the exhaust, doesn't this throw off the 02 sensor?

With air in the exhaust that wasn't present in the chamber, the computer would make adjustments to make a 14.7:1 exhaust, meaning the chamber was rich, right?

Or, if you delete your AIR, your car will run leaner?

 

No, O2 sensors, despite the name, do not sense O2.

 

I had that same question once. Here's what someone who was nice enough to tell me said. I later looked it up and then I could understand it, and it made sense. I just wish I could remember who told me. That way I could thank them.

During the time the engine warms up, the ECM is in Open Loop. The O2 sensor is not active in Open Loop.

During Open Loop the diverter on the AIR system routes all the air to the exhaust manifolds. This puts more Oxygen into the exhaust gases which... 1) helps the hydrocarbons to be burned a little more... 2) By burning the spent exhaust fumes more, it helps the O2 sensor warm up faster.

Once the O2 sensor is warmed up, or the coolant is warmed up, or after a certain time frame, the ECM goes into Closed Loop and the O2 reading is used. Then the AIR diverter routes the air to the cat to introduce more Oxygen and help the cat do it's job. After the diverter re-routes the air to the cat, the O2 sensor doesn't "see" the air until the ECM goes into Open Loop again.

FYI, the ECM also goes into Open Loop at WOT, which also disables the O2 reading.

 

Simplest explanation I can come up with:

The O2 sensor is on the drivers side exhaust manifold.

Once the car is warmed up and in open loop, the smog pump is injecting air into the cat, not the manifolds.

Since the 02 sensor is before the point where air is injected, it makes no diff on what it'll read.

 

I already explained it.

Besides.... "Once the car is warmed up and in open loop,..." only happens under one condition. WOT!!!!!

I already said that to.

CamaroDriver is the coolest!!! <----- If you wanna repeat that you can. I'll let you repeat that all you want.

 

So as far as passing inspection goes, if the car is warmed up good, the 02 and a catalytic converter ( minus the A.I.R. tube ), is the only thing I need right?

 

Assuming they don't open the hood.

 

Ok I wasn't posting to try n show you up or get attitude. I was just providing a simpler explanation. Yes it left out some details but it gave the general idea which is normally what people want in a situation like this. And I did in fact notice you already posted an explanation. I'll get to that later.

And other members please step in and correct me I may be wrong, but your ECM does not go into open loop exclusively at WOT. There wouldn't be much point in that at all. It actually, once warmed up and in open loop it comes OUT of open loop at WOT, which is why heavily modded cars with stock chips sometimes run ok until WOT when they fall on their face, because the tables are so far off from the engines air/fuel demands, though it can compensate under non-WOT because it is in an open loop/feedback mode.

And BTW, wanna know what WRONG infor you just posted?

1. Closed loop - Warm up and WOT
2. Open loops - warmed up, reading 02

Also, WOT has no effect on air diversion as far as I know, only temperature.

So you see, I posted, because I felt your post was misguided enough to warrant somone who knows what the ***** they're talking about posting something thats actually correct.

Word of advise to you. Don't go running your mouth at senior members when you don't what they hell you're talking about. I would have let this go if you hadn't got a smartass attitude.


CamaroDriver has just been ~OWNED~ by HrdRockA4305

 

LMAO!!!!!! That's funny.

Just because you've been a member here longer than I have doesn't mean you know more.

And I wasn't being a smartass, I was trying to have fun. Heaven forbid that.

Just to give you a recap on electricity, open loop is an open circuit. It means that there's no path for the current to follow.

Closed loop means there is a closed circuit. There is a path for the current to follow.

The terms came from simple elec. terms. When the car is warming up, the ECM is in a FIXED program that allows no variables. This is why they call it "open loop".

It seems to me that you totally understand your slang terminology pretty well, even though you obviously misuse it. I guess it's a rebellious way for you to overcome the reality that you're wrong.

If you want to continue you're little escapade I must for warn you. I'm in open loop.... which means; I'm just getting warmed up.

BTW, thanks for asking someone else to verify what I'm saying. I'll be waiting for your apology, if your manhood will allow it.

OH...... and here's some info from this site. Feel free to click on it to learn more BEFORE you open your mouth and insert your foot again.

One more thing..... I am the one who knows what the ***** I'm talking about, and actually, I am correct.

 

I just want to say this so someone gets correct information out of this post. The oxygen sensor is located downstream from where air is injected in the exhaust manifolds/headers and it is only used in closed loop. Air is injected into the exhaust manifolds/headers only during open loop, and in closed loop it is diverted by the diverter valve into the catalytic converter. Nobody needs to be "owning" anyone around here. Grow up.

 

Someone else repeating what I've already said.

Is that all you people do around here?

BTW, Just a joke. Calm down.

 

Well, looks like I just made an *** of myself quite successfully.

Hey, I can accept that. By shutting somone up who was flat out wrong, you prevented more misinfo from getting spread around. Which was what I was trying to do, unfortunately when its been a bad week and you ovvereact it kinda raises the stakes a little.

I guess now I gotta figure out what got me into thinkin it was the other way. Thats how I thought it was since I knew there were even 2 different modes in the ECM. Maybe the logic I was using was "Open = open to input, Closed = closed to input." And when you think something for a long time, it seems more true if nobody ever says differently. Well, problem solved. This thread hopefully prevent things like this from happening to a few more people like myself who heard it wrong and just accepted it.

 

It's all good.

You've shown that you're a big man. I like that.

I'm sorry also, I should have shown more humor in my response to you. I guess now that I re-read it, it does sound pretty smartassish (<---- is that a word??? ).

 

See, its possible to sometimes straighten things out before the thread turns into a war and the mods lock it isn't it? (Hint to some other board members, especially in App+Detail and Street Racing)