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 |
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 |
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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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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Re: Failed Smog need help asap
Originally Posted by d1nki
(Post 41025383)
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 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. |
Re: Failed Smog need help asap
Originally Posted by d1nki
(Post 41026208)
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.
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 |
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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Re: Failed Smog need help asap
Originally Posted by d1nki
(Post 41027183)
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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Re: Failed Smog need help asap
Lol I hope it does lol. Does it matter what brand?
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Re: Failed Smog need help asap
Originally Posted by d1nki
(Post 41028636)
Lol I hope it does lol. Does it matter what brand?
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Re: Failed Smog need help asap
ok thanks
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Re: Failed Smog need help asap
its california, you failed because it runs on gasoline
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Re: Failed Smog need help asap
Originally Posted by Spawne32
(Post 41028901)
its california, you failed because it runs on gasoline
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. |
Re: Failed Smog need help asap
Look here for good info
http://www.car-sound.com/04basics/04charts.asp |
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 |
Re: Failed Smog need help asap
check timming
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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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