I have a 94 honda prelude si and i'm changing the exhaust because the one it has sounds bad but the thing is it looks like the previous owner had the exhaust welded. What I wanted to know was, where does the oxygen sensor go, in the cat, or the resonator? And does the resonator go before the cat or the cat and then the resonator? Reason I ask this is because the current cat it has does not have the oxygen sensor plug and the one I bought does, also the current setup has the oxygen sensor in the resonator.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by paniaguae640 &raquo;</TD></TR><TR><TD CLASS="quote">I have a 94 honda prelude si and i'm changing the exhaust because the one it has sounds bad but the thing is it looks like the previous owner had the exhaust welded. What I wanted to know was, where does the oxygen sensor go, in the cat, or the resonator? And does the resonator go before the cat or the cat and then the resonator? Reason I ask this is because the current cat it has does not have the oxygen sensor plug and the one I bought does, also the current setup has the oxygen sensor in the resonator.
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Oxygen sensor is on the down-pipe before the cat on an OBD-I 4th gen. Resonator is after the cat. The catalytic converter you purchased was most likely for an OBD-II Prelude (96-01) that uses a secondary oxygen sensor mounted in the cat. You can use this catalytic converter; just be sure to plug the hole up with a bolt, which it should have came with or you'll have an exhaust leak.

 

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

Oxygen sensor is on the down-pipe before the cat on an OBD-I 4th gen. Resonator is after the cat. The catalytic converter you purchased was most likely for an OBD-II Prelude (96-01) that uses a secondary oxygen sensor mounted in the cat. You can use this catalytic converter; just be sure to plug the hole up with a bolt, which it should have came with or you'll have an exhaust leak.</TD></TR></TABLE>

that explains a lot, I have the resonator before the cat and it looks like they welded it there. Could this be the reason why the exhaust sounds bad or could this possibly lead to failed emissions, and/or problems later on? Just any regular bolt will do?

 

you sure its a resonator before the car or the flex pipe? how long is it?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by paniaguae640 &raquo;</TD></TR><TR><TD CLASS="quote">

that explains a lot, I have the resonator before the cat and it looks like they welded it there. Could this be the reason why the exhaust sounds bad or could this possibly lead to failed emissions, and/or problems later on? Just any regular bolt will do?</TD></TR></TABLE>

It could sound bad because of this setup. Or it could be the muffler or maybe there's just exhaust leaks. I've never heard of anyone with a Prelude welding a resonator before the catalytic converter, sounds like a shitty cheap exhaust shop job.

Not too sure if this could cause a failure during an emissions test, as you still have a converter. As for future problems, I don't see any... just annoyance as you said the exhaust sounds bad. I'd try and find an OEM cat-back off craigslist in your area or possibly look into an after market. Take your catalytic converter up to a hardware store and look for a bolt that matches the threads. Most likely, you'll need to shorten the bolt with a dremel wheel/cutting wheel.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Infinity_Racer &raquo;</TD></TR><TR><TD CLASS="quote">you sure its a resonator before the car or the flex pipe? how long is it?</TD></TR></TABLE>

x2

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Infinity_Racer &raquo;</TD></TR><TR><TD CLASS="quote">you sure its a resonator before the car or the flex pipe? how long is it?</TD></TR></TABLE>

now that I think about it I think its a flex pipe because it is not covered, and resonators are covered? Its about 7 to 10 inches long

 

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

It could sound bad because of this setup. Or it could be the muffler or maybe there's just exhaust leaks. I've never heard of anyone with a Prelude welding a resonator before the catalytic converter, sounds like a shitty cheap exhaust shop job.

Not too sure if this could cause a failure during an emissions test, as you still have a converter. As for future problems, I don't see any... just annoyance as you said the exhaust sounds bad. I'd try and find an OEM cat-back off craigslist in your area or possibly look into an after market. Take your catalytic converter up to a hardware store and look for a bolt that matches the threads. Most likely, you'll need to shorten the bolt with a dremel wheel/cutting wheel.

x2</TD></TR></TABLE>

I just changed the muffler and it still sounds the same, and I found exhaust leaks but welded them and it still sounds bad. Is a resonator always covered? So in a stock setup does the flex pipe come first, then the cat, and then the resonator? If this stock setup is true then I don't think I have a resonator.

 

you sure its a resonator? Thats a wierd place to put it. You should post a pic so we can all laugh at what some moron did to your poor car.

That O2 sensor port you don't need . Gotta love OBD1 (for many reasons) Only a primary O2 sensor in around your down pipe.

The resonator is "suppose" to go somewhere inbetween the cat and your muffler. They are good as they keep the "beez" out of your "cans" heh heh

Any bolt that fits in that port will do. The bolt is pretty big usually though.

That could explain why it sounds bad. Who knows. Play a sound clip if you can with some pics and maybe we can help you clean it up a bit.

How's the cat look anyway? Knock on it and listen for rattling. It should like a hallow ping. If it sounds really dense it could be clogged. Failed emmisions could be a million things. evap even, your guess is a good as ours. Read your check engine code. Jumper the blue two pin connector behind the centerconsol located by your gas pedal (to the right of it behind the plastic centerconsol panel)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mattsnooz &raquo;</TD></TR><TR><TD CLASS="quote">you sure its a resonator? Thats a wierd place to put it. You should post a pic so we can all laugh at what some moron did to your poor car.

That O2 sensor port you don't need . Gotta love OBD1 (for many reasons) Only a primary O2 sensor in around your down pipe.

The resonator is "suppose" to go somewhere inbetween the cat and your muffler. They are good as they keep the "beez" out of your "cans" heh heh

Any bolt that fits in that port will do. The bolt is pretty big usually though.

That could explain why it sounds bad. Who knows. Play a sound clip if you can with some pics and maybe we can help you clean it up a bit.

How's the cat look anyway? Knock on it and listen for rattling. It should like a hallow ping. If it sounds really dense it could be clogged. Failed emmisions could be a million things. evap even, your guess is a good as ours. Read your check engine code. Jumper the blue two pin connector behind the centerconsol located by your gas pedal (to the right of it behind the plastic centerconsol panel)</TD></TR></TABLE>

I think I have no resonator because it does sound like you say the bee sound and I did not see anything between the cat and the muffler, its just straight. I recently ordered an exhaust system, the Apexi GT Spec. Does anyone know if the aftermarket exhaust systems come with resonators?

 

Yes, the Apexi will have a resonator. I have the N1 and love it - you'll love the sound of the GT though.

 

Thanks to all the people who helped out.