What gas do I use to pass smog?
07-20-2010, 08:28 AM
#26
Re: What gas do I use to pass smog?
I read alcahol really does the trick
Here are my numbers
15 mph: rpm 1841 %CO2 14.6 %O2 .4 HC (PPM) 141 CO (%) .67 NO (PPM) 978
25 mph: rpm 2011 %CO2 14.6 %O2 .3 HC (PPM) 102 CO (%) .69 NO (PPM) 1012
07-20-2010, 10:07 AM
#27
Honda-Tech Member
Re: What gas do I use to pass smog?
You should post the limits too. It looks like you are close, may just be a bad cat.
07-21-2010, 07:22 AM
#28
Re: What gas do I use to pass smog?
But I did some seafoam and I'm getting a new o2 sensor, couldn't find that airleak but I tightened some stuff up. I think it might be my bad iacv
I'll post the limts
07-21-2010, 07:33 AM
#29
Re: What gas do I use to pass smog?
15 mph: HC (PPM) 94 CO (%) .58 NO (PPM) 847
25 mph: HC (PPM) 76 CO (%) .49 NO (PPM) 786
I'm hoping I'll pass today, I have a friend who just goes to any smog station and hands the guy 250.00 dollars
07-21-2010, 12:13 PM
#30
Honda-Tech Member
Re: What gas do I use to pass smog?
See that's strange in Oregon we don't have to do a rolling test. we just do an idle test "phew".
Although in my endeavors I have tried the following things.
Run really lean AF ratios --> 16-17-18:1 at idle any leaner depending on your engine it will hesitate.
Run like the least amount of ignition timing possible my H22 wouldn't run at anything below 10 degrees.
Denatured alcohol on a low tank.. I believe if you have an AF gauge in your car the reading will show really really rich I think... although it will be running cleaner.
Other things I tried was holding the clutch out a bit while idling and have the car idle lower 500rpm ish... however in your case you cant since you have to do a rolling test.
by the time you get done reading this, long story short I bought a new cat it had 3-4 miles on it and it passed with flying colors with no Micky mouse BS action going on, on my part... 14.7:1 at idle and 16 degrees base timing...
So none of the retarded things to try actually worked... and i took it to pass 5-6 times...
However to attempt to help you seafoam your car perhaps? the cat I was trying to pass with was actually bran new and it was bad, there is a brand with Mario Andretti on the box Magna flow... anyway there is a type of cat that I think has the letters HM on it... i forget but its a bit higher content of platinum in it so it filters out more of the bad exhaust gasses. I used this on my civic with an h22 and it passed with flying colors "at an idle test only"
Hope that helps.
--Aaron
Although in my endeavors I have tried the following things.
Run really lean AF ratios --> 16-17-18:1 at idle any leaner depending on your engine it will hesitate.
Run like the least amount of ignition timing possible my H22 wouldn't run at anything below 10 degrees.
Denatured alcohol on a low tank.. I believe if you have an AF gauge in your car the reading will show really really rich I think... although it will be running cleaner.
Other things I tried was holding the clutch out a bit while idling and have the car idle lower 500rpm ish... however in your case you cant since you have to do a rolling test.
by the time you get done reading this, long story short I bought a new cat it had 3-4 miles on it and it passed with flying colors with no Micky mouse BS action going on, on my part... 14.7:1 at idle and 16 degrees base timing...
So none of the retarded things to try actually worked... and i took it to pass 5-6 times...
However to attempt to help you seafoam your car perhaps? the cat I was trying to pass with was actually bran new and it was bad, there is a brand with Mario Andretti on the box Magna flow... anyway there is a type of cat that I think has the letters HM on it... i forget but its a bit higher content of platinum in it so it filters out more of the bad exhaust gasses. I used this on my civic with an h22 and it passed with flying colors "at an idle test only"
Hope that helps.
--Aaron
07-21-2010, 06:43 PM
#31
Honda-Tech Member
Re: What gas do I use to pass smog?
See that's strange in Oregon we don't have to do a rolling test. we just do an idle test "phew".
Although in my endeavors I have tried the following things.
Run really lean AF ratios --> 16-17-18:1 at idle any leaner depending on your engine it will hesitate.
Run like the least amount of ignition timing possible my H22 wouldn't run at anything below 10 degrees.
Denatured alcohol on a low tank.. I believe if you have an AF gauge in your car the reading will show really really rich I think... although it will be running cleaner.
Other things I tried was holding the clutch out a bit while idling and have the car idle lower 500rpm ish... however in your case you cant since you have to do a rolling test.
by the time you get done reading this, long story short I bought a new cat it had 3-4 miles on it and it passed with flying colors with no Micky mouse BS action going on, on my part... 14.7:1 at idle and 16 degrees base timing...
So none of the retarded things to try actually worked... and i took it to pass 5-6 times...
However to attempt to help you seafoam your car perhaps? the cat I was trying to pass with was actually bran new and it was bad, there is a brand with Mario Andretti on the box Magna flow... anyway there is a type of cat that I think has the letters HM on it... i forget but its a bit higher content of platinum in it so it filters out more of the bad exhaust gasses. I used this on my civic with an h22 and it passed with flying colors "at an idle test only"
Hope that helps.
--Aaron
Although in my endeavors I have tried the following things.
Run really lean AF ratios --> 16-17-18:1 at idle any leaner depending on your engine it will hesitate.
Run like the least amount of ignition timing possible my H22 wouldn't run at anything below 10 degrees.
Denatured alcohol on a low tank.. I believe if you have an AF gauge in your car the reading will show really really rich I think... although it will be running cleaner.
Other things I tried was holding the clutch out a bit while idling and have the car idle lower 500rpm ish... however in your case you cant since you have to do a rolling test.
by the time you get done reading this, long story short I bought a new cat it had 3-4 miles on it and it passed with flying colors with no Micky mouse BS action going on, on my part... 14.7:1 at idle and 16 degrees base timing...
So none of the retarded things to try actually worked... and i took it to pass 5-6 times...
However to attempt to help you seafoam your car perhaps? the cat I was trying to pass with was actually bran new and it was bad, there is a brand with Mario Andretti on the box Magna flow... anyway there is a type of cat that I think has the letters HM on it... i forget but its a bit higher content of platinum in it so it filters out more of the bad exhaust gasses. I used this on my civic with an h22 and it passed with flying colors "at an idle test only"
Hope that helps.
--Aaron
11-23-2011, 03:31 PM
#32
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Re: What gas do I use to pass smog?
11-26-2011, 09:16 PM
#33
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Re: What gas do I use to pass smog?
12-13-2011, 01:16 AM
#34
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Re: What gas do I use to pass smog?
Pretty easy to pass HC and CO if your running perfect air to fuel, but what can make you fail the most is NOx because it can be caused by bad thermostat, bad cat, bad tune, EGR valve if present, carbon build up, oil or/and high compression. You just never know what it could be, but best thing to do if the number is over 1000 is to just buy a new cat, it will usually do the job in removing NOx.
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