I have a 97 civic with an OBD-IIa integra LS swap. I deleted the Cat and have no secondary o2 sensor. Should I be using an o2 sim? I have been told that I am probably running lean right now.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by redej878 &raquo;</TD></TR><TR><TD CLASS="quote">I have a 97 civic with an OBD-IIa integra LS swap. I deleted the Cat and have no secondary o2 sensor. Should I be using an o2 sim? I have been told that I am probably running lean right now.</TD></TR></TABLE>

Is your check engine light on??

 

yes

 

my engine light came on when i took my cat out and put a test pipe in. The o2 simulator doesn't work because the o2 simulator needs some back pressure for it to be effective. Your check engine light wont turn off until you put a high flow cat in or your stock one. You need back pressure for your light to turn off and the o2 simulator wont do anything because its relient on back pressure. So if you get a high flow cat you might need the simulator.

 

obd2 ECU + no cat = O2 simulator


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EM199dcs &raquo;</TD></TR><TR><TD CLASS="quote">my engine light came on when i took my cat out and put a test pipe in. The o2 simulator doesn't work because the o2 simulator needs some back pressure for it to be effective. Your check engine light wont turn off until you put a high flow cat in or your stock one. You need back pressure for your light to turn off and the o2 simulator wont do anything because its relient on back pressure. So if you get a high flow cat you might need the simulator.</TD></TR></TABLE>
WTF are you talking about?
an O2 simulator has nothing to do with backpressure. It's an electronic device that can be mounted in the ECU if you're decent with soldering.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Relic1 &raquo;</TD></TR><TR><TD CLASS="quote">obd2 ECU + no cat = O2 simulator</TD></TR></TABLE>

o2 simulator doesnt work unless you have back pressure. what kind of exhaust do u have redej878

 

I think you're thinking of the wrong thing here man, check my edited post above.

 

I have 2-1/4 inch piping to a JSR N1 style muffler

PS stock LS header

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Relic1 &raquo;</TD></TR><TR><TD CLASS="quote">I think you're thinking of the wrong thing here man, check my edited post above.</TD></TR></TABLE>

I had the same problem and I have a skunk 2 cat back. I got a test pipe and put it in and my CEL came on. I bought an o2 simulator thinking it will help. the plug and play one for $80.00 and it was still on. I called casper electronics were i bought it from and they said for that o2 simulator to work you have to have some sort of back pressure. So I think were talking about 2 different kinds of o2 sims

 

who did you talk to at casper? which version of the simulator?
I live 5 minutes from them. I'll be sure to ask about that version of the simulator. This is very new and confusing to me.

here is a decent write up on what an O2 simulator does. It's not for a honda but the same rules apply.
http://www.afterthoughtsauto.com/o2sim.html

I've put in a few O2 simulators over the years. Not one relied on backpressure.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Relic1 &raquo;</TD></TR><TR><TD CLASS="quote">who did you talk to at casper? which version of the simulator?
I live 5 minutes from them. I'll be sure to ask about that version of the simulator. This is very new and confusing to me.

here is a decent write up on what an O2 simulator does. It's not for a honda but the same rules apply.
http://www.afterthoughtsauto.com/o2sim.html

I've put in a few O2 simulators over the years. Not one relied on backpressure.</TD></TR></TABLE>

I'm not sure one of the guys at the shop. But the one I am talking about is part number 104055. I called and he said thats what fit a 99 civic Si. and he was saying the o2 simulator wouldnt work unless you had back pressure. Thats weird maybe that guy was full of ****!

https://www.casperselectronics...honda

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EM199dcs &raquo;</TD></TR><TR><TD CLASS="quote">

I had the same problem and I have a skunk 2 cat back. I got a test pipe and put it in and my CEL came on. I bought an o2 simulator thinking it will help. the plug and play one for $80.00 and it was still on. I called casper electronics were i bought it from and they said for that o2 simulator to work you have to have some sort of back pressure. So I think were talking about 2 different kinds of o2 sims</TD></TR></TABLE>

you are mistaken. all an o2 sim does is simulate the voltage the ecu is looking for so you won't throw a cel. It has absolutely nothing what-so-ever to do with backpressure. O2 sims are notorious for not working properly, as the secondary o2 signal needs to be within a certain range of the primary o2's reading. Since the simulator puts out a constant voltage, it may or may not be within spec when compared to the primary o2's reading.

IMO, just run a secondary o2. a muffler shop can add an o2 bung for you real cheap.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EM199dcs &raquo;</TD></TR><TR><TD CLASS="quote">

I'm not sure one of the guys at the shop. But the one I am talking about is part number 104055. I called and he said thats what fit a 99 civic Si. and he was saying the o2 simulator wouldnt work unless you had back pressure. Thats weird maybe that guy was full of ****!

https://www.casperselectronics...honda</TD></TR></TABLE>
ahhh, that's an inline converter not a true simulator. I didn't realize they changed like that. I'll have to stop in and ask why they switched.
Basically all it does is reduce the signal from the O2 to look like the cat is there.

true simulator --&gt; DIY style http://www.mkiv.com/techarticl...lator/
you can even see the original link (that's now invalid) to the caspers O2 simulator

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Relic1 &raquo;</TD></TR><TR><TD CLASS="quote">
ahhh, that's an inline converter not a true simulator. I didn't realize they changed like that. I'll have to stop in and ask why they switched.

true simulator --&gt; DIY style http://www.mkiv.com/techarticl...lator/
you can even see the original link (that's now invalid) to the caspers O2 simulator</TD></TR></TABLE>

ahhh Thanks Relic1 and IHateJDM Yeah I was mis-informed then. shitty. Thanks though.

 

Thanks to all for your input it has been helpful!