OK I just put Jet hot LT headers on my car, I have a custom 2 1/2 inch y-pipe on it, But I do not have 02 senors, I cut them off when I done the install since I didn't think I needed them since I converted my PCM to OBD1 through PCMforless, my mechanic told me I did in fact need them b/c My car would not be able to do the Air/fuel ratio's right if I did not have 02's.

Can I not get these things programmed out of the car OR are they a must, IF I can get them programmed out how will the air/fuel ratio's be adjusted.
I have already sent off for a Extension from thunderracing and tommarrow I am going to go to advance and pick up 2 02 sensors, (they cost $50 buck each )

Any advice or technical help, thanks guys

 

yes you need to have at least one set of 02s.

 

Yeah you need O2s. Car shouldnt idle right or even run right without them. You CAN have them programmed out but wouldnt recommend it, sometimes that doesnt really work and you still have problems. Best to go ahead and get them with the extensions.

 

It seems like I remember seeing O2 sensor dummy type things in a Summit or Jegs or something for f-bodies, but I'm not sure if they'll fit your application. If I remember correctly you just plug them up and they send the computer a false good reading all the time. ---J.Bird

 

Well, your going to need the front o2's, my bungs were in the collector before the flange, rear o2's can be programmed out. I have the o2 simm's for the rear o2's on my 97.

 

O2 sensor is a requirement, if you use dummy sensors or
anything like that, the car will think the ratio is doing just
fine.

tis a bad idea, O2 is apart of a set of systems which determine
how the car is preforming, infact it's a very vital componet on
EFI cars.

you wouldn't work right if I cut your tongue out, would you?

 

Hey man it is OK to run no o2's I did my long tubes and have had them for about 4k miles now and everything is fine runs fine and idles fine just came back from tennesee to illinois back and forth and everything is cool, i dont know why people say you must have 02's i can see losing some extra gas but who gives a damn thats why we have these cars anyhow. The car has a default program incase something go's wrong anyway, at WOT its bad assed and at crusing its still awesome! DONT WORRY GO FOR IT

 

ok this it a little misleading...

first off you have 2 sets of O2 sensors. the first set is located towards in your old manifold collectors and have a flat connector. these are critical for fuel management and close loop functioning. without them you are asking for trouble. the PCM cannot get vital AFR information b/c the O2 sensors are missing which means you can either be running extremely rich(poor gas mileage) or extremely lean(catastrophic engine failure my friend). the rear set are only there to monitor your cats. basically if you unplug them you will be alright b/c like i said they just tell the pcm if your cats are working properly.. just an ON/OFF switch if you wanna look at them that way. you will get SES light unless you find some O2 sensor simulators with the boxed connector. so a recap.. leave the front sensors and unhook the rear.

 

Dudes when i went to tenn i was getting almost 245 mpg with 3.23 and an auto with NO O2's so dont say things wont run right and things will have horrible gas milage! ESPECIALLY IF YOUVE NEVER DONE IT!

 

Hmm.. 245mpg ehh Maybe I should get rid of mine too JK.

You don't need o2's I think its better to disconnect them then to buy those o2 imitations to be honest.

 

Wildwill are you getting an SES light? You have to be.
Also, you are forcing the car to run in open loop.
If your SES light is on constantly how do you know something is wrong? Do you scan your car weekly or even daily?
The reason fuel injection works so well and these engines last so long is because of the O2 sesor and its ability to help the PCM deliver the optimum A/F ratio.
It may work fine right now but I am willing to bet you have issues in the future.

 

Here you go.

 

Yeah i have a SES light but that came on when i removed the AIR for the Lt's. Im not in it to argue I can see your points and all that but im telling you from experience it works fine thats all!

 

EDIT: I just looked back and noticed you made reference to the "lt's"
so just take my variables as a grain of salt, I looked up a 97
camaro z28 convertible, the highway mileage is 25mpg in
an auto for a V8. I'm very sure that all of them are very close
to this range.

It may work fine, but let me point out:

working fine does not equal (!=) working properly.

car never enters closed loop, fuel and timing has to be guessed,
you lose alot of performance if you have fuel injection and no
O2 sensors.

regardless of whatever you want to believe, this is the way it
is, the computer is designed to function with the O2 sensor, in
it's absence you leave it without an important ability, everything
has to be GUESSED by the computer just to keep the car running.

I know for a fact that when my O2 sensor failed (OBD-I, third
generation camaro required one sensor in the manifold to
detect A/F ratio)
my mileage went from a good 17mpg in the city, to about 4mpg.

I was putting 10 to 15 bucks of gas in the car, on a daily basis,
not to mention that the carbon buildup was so bad, that where
the car was parked every day had black soot on the walls where
the mufflers are at.

It all depends on a ton of factors to determine weather or not
your car runs properly.

you said you get 245mpg? I'm sure you mean you get 245miles
per tank.

This wouldn't happen to be a third generation camaro, would it?
perhaps a Z28? maybe a 90-92 model? you SHOULD be getting
26mpg or better on the highway, which on a 16 gallon tank
nets you over 400miles on a tank of fuel.

that's without trying to do 130 on the highways, though.

So let's say you're Mr. Leadfoot like me, and you only get 23mpg.

on a 16 gallon tank (15.5 capacity) at 23mpg, that's 368miles
on a tank of fuel, on the highway.

Now if you mean 24.5 miles to the gallon, well that's not bad at
392 miles, but without O2 sensors, I highly doubt that's
the case.

so 245miles to the tank, this means your mileage is about 15mpg.
right? 15*16 = 240

woah wait a minute there, that's REALLY low. ESPECIALLY for the
highway where your final gear is 3.23

a 88 model TH-700R4 has a 4th gear of .70, with 3.23 rears, a
full clutch lockup, 17 inch rims.. at 75mpg highway speed. that
puts you at ~1700rpm cruise speed.

rather low, no? especially for 245mpg.

I think your car is a little sick and sad without your O2 sensors.

but hey, i'm just preaching, it's your car, your money, do whatever
the hell you want to.

 

If you want the pcm to do what it was designed to do and compensate for conditions, you need the pre cat O2s working.