I put a custom made test pipe put on a few weeks ago and we just unplugged the o2 sensor. Now some people are telling me i am loosing power because the o2 sensor has something to do with controlling air flow or some other bs they were talking about. Is this true? Just curious because i really don't see it happening but i would like to get yalls input....TIA.....

 

unpluging it will throw a Check engine light and will make your ecu run a safety program which equals less power just plug it back in and zip tie it up

 

there's definitely a decrease in power. i was in the same boat as you and when i installed the o2 sensor, i noticed quite a large gain in power. not to mention my gas mileage was horrible without the 02 sensor, i was getting like 200 miles to a tank, but with the 02 installed, i get like 300+ to the tank.

 

Yeah, get it fixed ASAP. My car ran like absolute garbage when mine broke. The mpg went WAY down, and the car didn't accelerate as well.

 

Did you remove both oxygen sensors? There are two in the cat.

You need the primary one (closest to the manifold), the secondary one just monitors the health of the cat and does not effect the A/F in any way.

You can either have a bung welded to the test pipe, or the manifold, and put the primary o2 sensor into it.

 

the only o2 sensor i took out was the one on the cat, i unplugged it from the plug by the block. But ill take o2 sensor off the cat and plug it back in and just zip tie it or fix it so it doesnt hang loose.....TIA...

 

So there still is one in your exhaust manifold?

 

i thought their was just one in my cat since im obd1?

 

Ah yes, forgot about obd1.

yes you only have one. You will either have to have a bung welded into your testpipe or the exhaust manifold.

 

Leave the O2 sensors in, most people dislike choking on exhaust fumes (as do the suits in the EPA).

 

ihave a 98 ls obd2. i am running a hi flow cat but it doesen't have any opening for mysensor for my cat so every once in a while i will throw a check engine light when i am crussing at like 3 grand. is this bad. is there a way i can fix this or avoid the light. i would like to keep thehigh flowcat on instead of putting on the factory. ?????????????????/

 

to redteg
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StyleTEG &raquo;</TD></TR><TR><TD CLASS="quote">You can either have a bung welded to the test pipe, or the manifold, and put the primary o2 sensor into it.</TD></TR></TABLE>
or you can unplug the light bulb but thats not a good idea...

 

well i plugged it back in and i zip tied it up, will this still make me run rich or slower due to it not being in the test pipe or no???

 

anybody???

 

OT:

on a OBD2 car there is a o2 sensor on the header and cat right? if i convert to obd1 i can unplug/remove the o2 sensor on the cat correct?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TeamTooQuick &raquo;</TD></TR><TR><TD CLASS="quote">well i plugged it back in and i zip tied it up, will this still make me run rich or slower due to it not being in the test pipe or no???</TD></TR></TABLE>
Did you get it put in the exhaust manifold or test pipe? Or did you just plug it in and zip tie it up?

It needs to be in the exhaust to function properly.

 

So seeing that if you run a chipped p28, the programs usually don't read the O sensor correect? So I would i be able to disconnect the O sensor form the header and plug the hole?

 

I just zip tied it up. So it still wont work right without it being in the test pipe? I thought it had like a set fuel map to run no matter what. I really never looked into anything about this so im just trying to learn about it....TIA...

 

Really, if you do not have your O2 sensor plugged in and the ECU isn't set up to bypass it. You should throw a code and the ECU will go into limp mode. It's horrible on your car.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TeamTooQuick &raquo;</TD></TR><TR><TD CLASS="quote">I thought it had like a set fuel map to run no matter what.</TD></TR></TABLE>
It does have a set fuel map if the 02 sensor is messed up. It's what they call "limp mode". The values in that setup are VERY conserative and only meant for you to be able to drive your car until you get it fixed.

Get a bung welded in your test pipe, put the O2 sensor in there, and be amazed at the power and efficiency difference.

 

the best thing to do is to make a "o2 sensor simmulator" for the secondary 02. this will feed the ecu the voltage it wants and the car will be happy. i have used this setup for over a yr now, with no check lights or loss in power.

 

its not giving you less power. trust me .
all that second o2 does is tell you your cat is bad. . . thats it it does not hinder performance at all i had mine like that for 2.5 years and i have dyno proven with and without it in.

 

i dont agree. was this odb1 or 2.

most of the time when you throw a cel on odb2 your going to go into limp mode. with the way the ecu retards the timing you will for sure loose power.

platinum.

 

thats wrong , if its the secong 02 all it does is emisssions stuff to tell you the cats bad .
now if its obd1 or the 1st o2 sensor than thats a diff story. but idf thats not connected youll know it prob even bfore the cell kicks.

 

I have a cel on my car for my secondary 02 sensor.
I see the check engine light everyday.

Car runs fine