d1nki

I failed smog today in my 95 LS, stock everything. I am suspecting it is the CAT but i dont know. I ran some fuel injection cleaner before the smog test. What do you guys think? Here are the numbers:

15mph: CO2=14.06, O2=0.34, HC: max=90, meas=113, CO: max=0.54, meas=0.68, NO: max=711, meas=1737

25mph: CO2= 14.41, O2=0.09, HC: max=56, meas=70, CO: max=0.53, meas=0.36, NO: max=754, meas=838

Local

In for some smog knowledge as well as I just failed also.

My only failed stat was CO (PPM) @ 15mph was 176 max was 71

RedDC2GSR

you may also need to replace your o2 sensors, when your hydrocarbon readout is that high it is running way rich. If you can get a free re-test I would take them out, clean them off with a wire brush, re-install, and go again. If you are still high you will have to replace them. a new cat and 02 sensors is going to set you back a few hundred but your car will run a lot better

d1nki

I don't mind paying the few hundred. The way I see it is, if I take care of it now I won't have to deal with it later, and I just want to pass already.

TunerN00b

Failed for both HC and NOx? That's bad.

High HC is a rich running enging. High NOx is a lean running engine. Can't have both at once, so it sounds like a failing cat.

Try running a bottle of ISO Heet in the tank during the test. It burns cleaner and cooler, reducing both counts.

sl0wDA9

Get a brand new cat installed. After that run a bottle a C2P Guarenteed To Pass formula in your tank and immediately take the retest. You WILL PASS. Trust me.

As long as you passed visually along with no leaks, overheating, check engine light, gas cap bullshit, blah blah and you do what I just said you'll pass for sure! Goodluck

d1nki

For sure Ill grab a fresh cat from an exhaust shop and a new o2 sensor and use that gauranteed to pass thing. Thanks for the input guys

sl0wDA9

Im not saying the C2P stuff works, many disagree, but I feel hey, what do you have to lose? It definately cant hurt. But yea with a brand new catalytic converter you'll pass with flying colors. It will block almost evrything, lol watch you'll see.

d1nki

Lol I hope it does lol. Does it matter what brand?

sl0wDA9

Nah, just get a stock replacement, I wouldnt push your luck with a high flow or anything..

d1nki

ok thanks

Spawne32

iTrader: (3)

its california, you failed because it runs on gasoline

Double Agent

lmao

Before you replace anything! Was the fuel injector cleaner still in the tank when you got tested or did you run it through till you were empty and then fill up before your test. If the cleaner was in there while you were getting tested it is still cleaning out the combustion chambers which is going to raise your HC and other emissions. Also, before spending major $$ on stuff like cats and O2s, be sure you don't just need a basic tune up.

all-mtr-teg

Look here for good info
http://www.car-sound.com/04basics/04charts.asp

robcivic559

i changed the cat and use my dc header and a short ram intake all i need for the smog was my carb number
the reason i wasn't passing was the timming my timming was at 10 my it needed to be +3 or at 15 to pass

check the timming

zhura86

check timming

d1nki

yeah cleaner was in there. and ill check timing tomorrow. hmmm the smog tech said it might be the cat too