TX Emission Failed

[Blade2001]

I failed TX emissions test other day. Here are the details:
I did the testing with two different fuel pressure settings.

Car: 1987 Turbo

Emission results with Fuel at 30 psig:
25 MPH testing
------------Standard ---- Reading
HC (ppm) 140 ----- 133
CO(%) 0.89 ----- 0.03
CO2 (%) none ----- 12.4
O2(%) none ------ 3.4
NOx(ppm) 984 ------ 2283 (Fail)
Dilution(%) > 6 ------ 12.4

15 MPH testing
------------Standard ---- Reading
HC (ppm) 144 ----- 169 (Fail)
CO(%) 0.81 ----- 0.15
CO2 (%) none ----- 13.9
O2(%) none ----- 1.5
NOx(ppm) 1077 ----- 2781 (Fail)
Dilution(%) > 6 14.1

-------------------------------------------------

Emission results with Fuel at 36 psig:
25 MPH testing
------------Standard ---- Reading
HC (ppm) 140 ----- 84
CO(%) 0.89 ----- 0.03
CO2 (%) none ----- 12.8
O2(%) none ----- 2.9
NOx(ppm) 984 ----- 1168 (Fail)
Dilution(%) > 6 ----- 12.8

15 MPH testing
------------Standard ---- Reading
HC (ppm) 144 ----- 208 (Fail)
CO(%) 0.81 ----- 0.68
CO2 (%) none ----- 13.8
O2(%) none ----- 1.0
NOx(ppm) 1077 ----- 2130 (Fail)
Dilution(%) > 6 ----- 14.5


Mods: AFPR, WB High Flow pump, K&N intake
RT 3" downpipe, RT High Flow Cat, 3" Cat back,
RC 550 injectors / Lexus AFM

Check Engine light is NOT ON. I assumed no codes..
The Random Technology (RT) catalyst is installed in 2003. I had issues with passing in the past due to hydrocarbons. I changed out the O2 sensor two years ago.
Never had teh NOx issues before. Could it be, my cat is bad?
I have the stock cat from the stock exhaust (second cat.. not the one on the downpipe). Should I swap the RT cat with stock and see if i can pass?
Or, I can put the stock injectors/AFM back on..
Or, just buy another new RT cat..

Any suggestions?

 

[tlo86]

i never had emissions in texas i had a half hearted inspection that just made sure your lights worked and tires werent worn too much

cat would raise nox and so would your egr system failing.

 

[figgie]

HC means raw fuel. You passed but BARELY (@ 30 psi). but failed on the 15 mph test @ 36.

It looks like from the other numbers that you are running lean and causing EGT to rise which contribute to higher NOx production.

Check your timing before hand?

 

[forcefedsupra]

Usually, I can go early on a Monday morning so I get in fast and just accelerate hard a few times and get the cat hot. So far, it has worked every time.

 

[Blade2001]

HC means raw fuel. You passed but BARELY (@ 30 psi). but failed on the 15 mph test @ 36.

It looks like from the other numbers that you are running lean and causing EGT to rise which contribute to higher NOx production.

Check your timing before hand?

EGTs usually runs 1200 to 1300 deg F, when I drive.. No, I didnt check timing.. I had set the timing to TSRM numbers back in 2004.. Never fooled with the CPS since..

 

[figgie]

EGTs usually runs 1200 to 1300 deg F, when I drive.. No, I didnt check timing.. I had set the timing to TSRM numbers back in 2004.. Never fooled with the CPS since..

you always check not because it may be off. Just to make damn sure you are within Toyota Spec

 

[3p141592654]

By my calcs you are running A/F of 17.3 at 30psi and 16.9 at 36 psi.

Super lean, no wonder you aren't passing. You need to figure out why you are not running closed loop.

 

[Nomad707]

i know how to fix it.

Move to Florida.


(my plans, lol)

 

[NastyNate]

If you even go to a place that checks emmissions in texas.... well that's your first problem. There are plenty that don't. I'd just go find a ghetto one adn get passed.

 

[NgoFcukinWay]

Find someone who'll pass you for a li'l extra dinero. :-D

 

[NastyNate]

man, here in SA you don't even have to pay extra to pass.

 

[BorHor]

I wish Cali was that easy.

 

[NastyNate]

i love Cali, but that's the only reason i will not ever live there........

 

[BorHor]

Cali is cool if you don't like modified street cars.

 

[NastyNate]

Cali is cool if you don't like modified street cars.

So true.... I need to start a company called stealth technology.... everything is "under the radar"

 

[Blade2001]

By my calcs you are running A/F of 17.3 at 30psi and 16.9 at 36 psi.

Super lean, no wonder you aren't passing. You need to figure out why you are not running closed loop.

My Exhaust tip is pretty black.. soot i guess.. so, i always thought I was running rich...
So, what cause it to run run far away from 14.7 ratio? Why am I also failing for HC if I am running lean? not burning enough?
Car idles around 700 rpm.. does that mean closed loop also?

Houston recently started NOx monitoring I think.. bad for me..

 

[figgie]

well here is the thnig

and extremly rich condition will show as lean too as it lets some of the O2 pass by thanks to all the fuel.

you guys saying Move to Fl where no emissions. I would not hold that to heart as your state is in financial trouble... AGAIN.

Emmission is easy cash for the state. I remember when FL was infact doing emission testing. They made lots of money

 

[3p141592654]

According to the Brettschneider equation you are running lean. A lean misfire can result in elevated HC, which is admittedly non-intuitive, but nevertheless true..

You need to follow the TSRM and check for O2 cross-count, and so on, to see what is going on. Based on the results, the O2 sensor should be hard over lean.