Failed SMOG. Too high NO and HC??
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Honda-Tech Member
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From: Los Angeles
Failed SMOG. Too high NO and HC??
I just took my car to the smog shop today and I failed the
-NO (PPM) 15mph Mine read:1952 and max is 487 @25mph
-NO (PPM) 25mph READ: 1811 max: 774 @ 25mph
-HC (PPM) 15mph read: 116 max: 66
-HC (PPM) 25mph read: 27 max: 49
Could anyone please help me figure out what's wrong? Or why they measured like this.
my car is 1999 honda civic si
b16a from japan
5 speed
110,000 miles
-NO (PPM) 15mph Mine read:1952 and max is 487 @25mph
-NO (PPM) 25mph READ: 1811 max: 774 @ 25mph
-HC (PPM) 15mph read: 116 max: 66
-HC (PPM) 25mph read: 27 max: 49
Could anyone please help me figure out what's wrong? Or why they measured like this.
my car is 1999 honda civic si
b16a from japan
5 speed
110,000 miles
Honda-Tech Member
Joined: Jun 2004
Posts: 7,539
Likes: 5
From: Sherman Oaks, CA, United States
Re: Failed SMOG. Too high NO and HC??
Put a working cat on it if it doesn't have one.
If the car has an EGR, clean/replace it. Also check timing and AFR. Running lean increases combustion temp. High combustion temps produce NOx pollution.
If the car has an EGR, clean/replace it. Also check timing and AFR. Running lean increases combustion temp. High combustion temps produce NOx pollution.
Honda-Tech Member
Joined: Feb 2005
Posts: 2,002
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From: Riverside
Re: Failed SMOG. Too high NO and HC??
this car does not have an egr. From the looks of those numbers you might need a cat. Post up the other readings such as the o2,co and co2 so I can get a better idea of what might be needed.
Honda-Tech Member
Joined: Oct 2005
Posts: 236
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From: la, ca, us
Re: Failed SMOG. Too high NO and HC??
hey guys, hope I'm not thread jacking but I'm running into something similar here are my numbers
1992 Honda Prelude 2.3si
Luckily I saved my test from two years ago
Test from 06/2010 - only thing changed after the test was on 11/2011 the distributor, and a few screws on my gas tank (also had a stock filter on in 2010, 2012 I have KN reusable cone filter)
2010 test - pass
http://i1131.photobucket.com/albums/...0smogtest2.jpg
2012 test - failed
http://i1131.photobucket.com/albums/...2smogtest2.jpg
My 2012 results are so high compared to my 2010 tests. Any ideas, the guy says my timing looks off. Do I need to advance the timing on my car? Would that only fix one of those? Should I run any fuel cleaner or seafoam in the tank, suck some seafoam through the brake booster? Thanks for advice.
1992 Honda Prelude 2.3si
Luckily I saved my test from two years ago
Test from 06/2010 - only thing changed after the test was on 11/2011 the distributor, and a few screws on my gas tank (also had a stock filter on in 2010, 2012 I have KN reusable cone filter)
2010 test - pass
http://i1131.photobucket.com/albums/...0smogtest2.jpg
2012 test - failed
http://i1131.photobucket.com/albums/...2smogtest2.jpg
My 2012 results are so high compared to my 2010 tests. Any ideas, the guy says my timing looks off. Do I need to advance the timing on my car? Would that only fix one of those? Should I run any fuel cleaner or seafoam in the tank, suck some seafoam through the brake booster? Thanks for advice.
Last edited by piggydog; Jun 5, 2012 at 03:47 PM.
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Honda-Tech Member
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Re: Failed SMOG. Too high NO and HC??
Hey guys. Not trying to jack this issues but i also have the same problem as the guy posted.
My NO is above 120 which needs to be below or at 120.
Does anyone know what i need to do?
My NO is above 120 which needs to be below or at 120.
Does anyone know what i need to do?
Honda-Tech Member
Joined: Jun 2004
Posts: 7,539
Likes: 5
From: Sherman Oaks, CA, United States
Re: Failed SMOG. Too high NO and HC??
Seriously though, you bumped a 2 year old thread for that? Provide all the numbers from the smog check, the year and model of car, and what mods if any, and maybe someone will have a better answer.
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