My 93 Honda Prelude wont pass smog, all stock right now exept DC sport headers, it was poluting 7% something before i changed the o2 sensor and it fails both 15 and 25 mph rolls, now i went for test run and it failed the 15mph, but 25 mph it passed, im trying to pass refree ticket. the o2 sensor is from 95 accord, the plug didnt match my so i had to cut the wires and match them up and make it to fit my prelude. I dont have no check engine light on, i dont know what can i do to make it pass. Can it be from catylic converter? Ill post the charts of the smog when i get home, any ideas?

 

bump anyone

 

Without the numbers this is just a total guessing game.

List 15mph and 25mph:

O2
CO2
NOx
HC
CO

 

i will as soon as i get home in 20 min they will be up

 

well here it is,
This is refree smog, before i changed o2 sensor


this is locol smog i did a pre-test after i changed the o2 sensor, by the way the o2 sensor is used

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by russlan44 &raquo;</TD></TR><TR><TD CLASS="quote">My 93 Honda Prelude wont pass smog, ......... any ideas?</TD></TR></TABLE>

Move as far away from California as possible.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by integrawow &raquo;</TD></TR><TR><TD CLASS="quote">Move as far away from California as possible. </TD></TR></TABLE>


lots of ppl say that to cali ppl lol

 

cat is usually a problem, when was the last time you changed it

 

never, sense i bough it never changed it, so right now looking for a cat converter, i got my 2.5 pipe waiting for me but before i can put it on i have this ticket that i need to pass and pay

 

All you need is a full tank of gas, a road atlas, and a destination very far away. California's emissions laws are mentally challenged. LOL

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by integrawow &raquo;</TD></TR><TR><TD CLASS="quote">All you need is a full tank of gas, a road atlas, and a destination very far away. California's emissions laws are mentally challenged. LOL</TD></TR></TABLE>


hahaha thats for sure, they give tickets for everything now, whatever they see something new to their eyes, they will be like WTF is this OH! no carb # its illigal......

 

Put the stock headers back on that might help some?

 

so does anyone understand the readings?

 

Your first readings show you running ridiculously rich and misfiring. Your old o2 was either lazy or biased low voltage.

Your second readings show decent combustion efficiency but poor catalytic efficiency. You were running so pig rich with the bad o2 sensor that you blew your cat. Should've fixed this at the start and you could've saved buying another cat.

 

lol i should of didnt had time cuz i knew i was running very rich, that my gas millege was so bad, and i would have check engine on. i was driving like that for about 2 months, dam

 

idk if it works but they sell this stuff at autoparts stores that a fuel addative and "guarantees" a pass or money back. its worth a try, i dont think theyd sell it if it didnt work.

but if not put a new cat and itll help ya out im sure.

 

just came from refree and it failed again, heres the results, now i dont know what to do. i got my CO down but at the end it fails.

 

If I were you, I would find somebody that would write you off as passing. I had to with my 97. It just failed horribly. Find someone that will pass you and look the other way. Its going to cost you a pretty penny, but you'll have the paperwork.

CA is the worst period.

 

NOx Oxides of nitrogen. High numbers mean excessive engine temperature. NO is produced when temperatures in the combustion chambers exceed 2500 degrees Fahrenheit.
Check to see if your EGR system is malfunctioning.

 

Put in a couple gallons of E85 before you go next time.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by flyrod &raquo;</TD></TR><TR><TD CLASS="quote">Put in a couple gallons of E85 before you go next time.</TD></TR></TABLE>

E85? whats that, i was thinking of doing seafoam, does that help?

 

bump for help guys, i know that most of you guys are out of CA, and dont have to go through this crap.

 

tried seafoam, im not sure i did it right cuz i didnt had this huge white smoke coming out my exhaust. so any ideas on how can i lower my NO PPM

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by russlan44 &raquo;</TD></TR><TR><TD CLASS="quote">
hahaha thats for sure, they give tickets for everything now, whatever they see something new to their eyes, they will be like WTF is this OH! no carb # its illigal...... </TD></TR></TABLE>

California should target the big diesel trucks before it targets a 1.5L civic. If you want to pass, I think its matters who you take it too, but since its the ref, your screwed.

 

it says that your EGR is modified... thats probably why you're failing the NOx... fix your EGR and you should pass...



yea.. you're so close from passing for NOx... fixing your EGR should help you out...