I had to use an ex exhaust manifold on my d16y8 swapped 97 civic HB and now i dont have a cat or a 2nd o2 sensor plugged in. Will this end up damaging my car or making it run shitty.

Im still averaging 33 mpg but when im in vtec around 6500 the car burps.

 

if you have a 2nd o2 sensor that's not plugged in, i'd think you'd get a cel.
hm.. is it bad to run without a cat? ask the nature

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dafuzzbudd &raquo;</TD></TR><TR><TD CLASS="quote">if you have a 2nd o2 sensor that's not plugged in, i'd think you'd get a cel.
hm.. is it bad to run without a cat? ask the nature</TD></TR></TABLE>

yeah im already rocking cel for the now fuel tank pressure sensor. I havent had a 2nd o2 sensor for about 3 months

 

?

 

From what I've read on here, the second o2 is to check that the cat is working properly. It doesn't have any effect on the cars performance.

 

from i hear that whenever the check engine light is on
it does not preform at same level
thats what i have heard i could be wrong

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ghetto Civic HX &raquo;</TD></TR><TR><TD CLASS="quote">From what I've read on here, the second o2 is to check that the cat is working properly. It doesn't have any effect on the cars performance.</TD></TR></TABLE>

Correct.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ghetto Civic HX &raquo;</TD></TR><TR><TD CLASS="quote">From what I've read on here, the second o2 is to check that the cat is working properly. It doesn't have any effect on the cars performance.</TD></TR></TABLE>

thats what i thought too, i just wanted to double check.

 

i thought a cel for any reason puts the car into limp mode.?.

no cat no problem (unless your a tree hugger) the effects will not be in out lifetime

 

you might want to look into it further, ive heard that the 2nd o2 sensor can affect the air/fuel ratio, which is why they make 02 simulators to send the correct signal to the ecu.
mine would idle rough for about 2-3 seconds at maybe 30 second intervals until i put a simulator on.

 

The second O2 sensor is nothing but a redundant sensor that makes sure the first O2 is working.

You WILL throw a code if it's not plugged into the wiring harness. Although, you can just zip-tie it out of the way if there is no need for it in the exhaust system. BUT PLUG IT IN!!!!

 

Katrina sure as hell was in our lifetime.

 

If its OBD2 its going to throw a code no matter what. The second O2S is to check the cats performance, nothing else. The first one messes with the air fuel mixture.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VtecnTurbo &raquo;</TD></TR><TR><TD CLASS="quote">i thought a cel for any reason puts the car into limp mode.?.

no cat no problem (unless your a tree hugger) the effects will not be in out lifetime </TD></TR></TABLE>

no. Only certain codes. I have had a mixture of codes and th eonly one that put me in limp mode was the MAP CEL

 

just curious, not being sarcastic, but was katrina related to dirty exhaust?

 

now actually i think we are already starting to feel the efects from vehicles with cats so not to have on is just speding up the process is it not listen i bet anyone 10 bucks by the time were to the point of thirty the earth is going to be doomed in a few years by the way things are going im no tree hugger but facts are facts if we keep up with what we are doing heads over tails were going to be fucked when we are older and facing the beginning of a new ice age or earth turning into another mars...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TurboTagTeam &raquo;</TD></TR><TR><TD CLASS="quote">The second O2 sensor is nothing but a redundant sensor that makes sure the first O2 is working.

You WILL throw a code if it's not plugged into the wiring harness. Although, you can just zip-tie it out of the way if there is no need for it in the exhaust system. BUT PLUG IT IN!!!!</TD></TR></TABLE>

to plug it in means i would have to get a cat and i dont have a spare $250 at the time and i have more important things to do to my car like replacing both inner tie rods. its sucks having about 30* of free play in the wheel

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pumpkyn &raquo;</TD></TR><TR><TD CLASS="quote">to plug it in means i would have to get a cat and i dont have a spare $250 at the time and i have more important things to do to my car like replacing both inner tie rods. its sucks having about 30* of free play in the wheel </TD></TR></TABLE>


No plug the o2 sensor into the wiring harness. not the cat. as long as the sensor is plugged up and zip-tied out of the way you shouldn't have a problem.

And keep the tree-hugging, earth-is-doomed discussions to GDD.

 

if you have the o2 plugged in with no cat, the CEL will cause you to go into limp mode. If you just unplug the o2 you will still have the CEL but no limp mode

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by buddy4002 &raquo;</TD></TR><TR><TD CLASS="quote">if you have the o2 plugged in with no cat, the CEL will cause you to go into limp mode. If you just unplug the o2 you will still have the CEL but no limp mode</TD></TR></TABLE>

Wrong. As stated above, the secondary O2 is only to tell the ECU if the cat is functioning correctly. If the cat is missing, you will throw a CEL, but you will not be in "limp mode", even with the sensor still plugged in.

 

when my cat was removed the car did go into limp mode, this was when i was running turbo though. I had to unplug the o2, and then it wouldnt bog while accelerating.. just my experience

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by buddy4002 &raquo;</TD></TR><TR><TD CLASS="quote">when my cat was removed the car did go into limp mode, this was when i was running turbo though. I had to unplug the o2, and then it wouldnt bog while accelerating.. just my experience</TD></TR></TABLE>

Something else was causing your problem then, because a secondary O2 CEL won't affect engine performance.

 

so just plug it in and zip it to the harness and that would be fine or is it just fine unplugged

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pumpkyn &raquo;</TD></TR><TR><TD CLASS="quote">so just plug it in and zip it to the harness</TD></TR></TABLE>

Yes sir.

 

i just put a differnt cat in then cut the wires and extended them my self then had a bung put in after the cat and now the cel went away.......but i went 2 years without it till i treid to pass smog. and failed! so i had to do it!