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Old 12-22-2009, 04:14 PM   #1
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Default Failed Smog need help asap

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
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Old 12-22-2009, 04:23 PM   #2
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Default Re: Failed Smog need help asap

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
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Old 12-22-2009, 04:26 PM   #3
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Default Re: Failed Smog need help asap

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
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Old 12-22-2009, 05:57 PM   #4
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Default Re: Failed Smog need help asap

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.
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Old 12-22-2009, 06:01 PM   #5
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Default Re: Failed Smog need help asap

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Originally Posted by d1nki View Post
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
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.
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Old 12-22-2009, 06:26 PM   #6
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Default Re: Failed Smog need help asap

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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.
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
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Old 12-22-2009, 07:45 PM   #7
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Default Re: Failed Smog need help asap

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
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Old 12-22-2009, 07:50 PM   #8
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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
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.

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Old 12-22-2009, 11:15 PM   #9
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Default Re: Failed Smog need help asap

Lol I hope it does lol. Does it matter what brand?
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Old 12-22-2009, 11:26 PM   #10
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Lol I hope it does lol. Does it matter what brand?
Nah, just get a stock replacement, I wouldnt push your luck with a high flow or anything..
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Old 12-22-2009, 11:48 PM   #11
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Default Re: Failed Smog need help asap

ok thanks
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Old 12-22-2009, 11:58 PM   #12
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Default Re: Failed Smog need help asap

its california, you failed because it runs on gasoline
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Old 12-23-2009, 08:25 AM   #13
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Default Re: Failed Smog need help asap

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its california, you failed because it runs on gasoline
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.
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Old 12-23-2009, 01:21 PM   #14
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Old 12-23-2009, 03:49 PM   #15
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Default Re: Failed Smog need help asap

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
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Old 12-23-2009, 09:16 PM   #16
 
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Default Re: Failed Smog need help asap

check timming
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Old 12-23-2009, 11:54 PM   #17
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Default Re: Failed Smog need help asap

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