Failed SMOG. Too high NO and HC??

Si818 · 03-22-2012, 06:55 PM

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

TunerN00b · 03-23-2012, 01:38 PM

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.

Si818 · 03-23-2012, 03:12 PM

What's an AFR bro? I'll be checking the EGR valve this weekend and timing. Thanks

TunerN00b · 03-23-2012, 04:03 PM

Quote:

Originally Posted by Si818

What's an AFR bro? I'll be checking the EGR valve this weekend and timing. Thanks

air fuel ratio

Si818 · 03-23-2012, 06:35 PM

For sure man, thanks for the help.

hybridmiklo · 03-23-2012, 08:25 PM

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.

piggydog · 06-05-2012, 11:53 AM

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.

03-22-2012, 06:55 PM	#1
Si818 Honda-Tech Member Garage is empty, add now Join Date: Mar 2012 Location: Los Angeles Posts: 45 iTrader Rating: (0)	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

03-23-2012, 01:38 PM	#2
TunerN00b Honda-Tech Member Garage is empty, add now Join Date: Jun 2004 Location: Sherman Oaks, CA, United States Posts: 7,032 iTrader Rating: (0)	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.

03-23-2012, 03:12 PM	#3
Si818 Honda-Tech Member Garage is empty, add now Join Date: Mar 2012 Location: Los Angeles Posts: 45 iTrader Rating: (0)	Re: Failed SMOG. Too high NO and HC?? What's an AFR bro? I'll be checking the EGR valve this weekend and timing. Thanks

03-23-2012, 06:35 PM	#5
Si818 Honda-Tech Member Garage is empty, add now Join Date: Mar 2012 Location: Los Angeles Posts: 45 iTrader Rating: (0)	Re: Failed SMOG. Too high NO and HC?? For sure man, thanks for the help.

03-23-2012, 08:25 PM	#6
hybridmiklo Honda-Tech Member Garage is empty, add now Join Date: Feb 2005 Location: Riverside Posts: 1,772 iTrader Rating: (0)	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.

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06-05-2012, 11:53 AM	#7
piggydog Honda-Tech Member Garage is empty, add now Join Date: Oct 2005 Location: la, ca, us Posts: 235 iTrader Rating: (0)	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. Last edited by piggydog; 06-05-2012 at 03:47 PM.

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Failed SMOG. Too high NO and HC??