Fonque

I was tested on July 21st Failed:
HC: Limit: 1.0000 GPM my car .9445 GPM pass
CO LImit: 20.0000 GPM my car 14.4973 GPM Pass
NOx LImit: 2.2000 GPM my car 3.7049 GPM Fail

I was tested today Nov 19th
I cleaned the throttle body (removed from car), and removed the silencer from my exhaust which has 2.25" piping
HC: 2.2702 GPM fail
CO: 16.7874 GPM Pass
Nox: 4.3421 GPM fail

I failed far worse the second time. I just need a list of anything and everything i can do to fix this. Also I just changed out the spark plugs and wires, cap and rotor like 6000 mi ago.

If after the next time i go in december this car does not pass or get very close to it, Im selling this car or donating it and getting a maxima.

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i program my heart to beat break beats and hum basslines in exhalation - matter, verse, spirit
TELL THE TRUTH!

 

SE-Rawkus

I heard something about turning down the fuel pressure and adding some alcohol into the gas tank will help you pass

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Manny E.
523 whp & 409 wtq ---RETIRED

Nag_SER

My brother's 92 would not pass the roller test for anything. He replaced virtually everything (including the cat) and it still would not pass. Although it was much cleaner than before, it was still over 2 times the HC limit.

He installed a 1st gen Super AFC (the small black one w/ 5 knobs on the front), leaned it out 8% across the low end of the RPM range and it passed with flying colors.

La_Noche

EGR controlls NOX. Take off the EGR valve, clean the sh*t outta it with a can of CleanRCarb, and follow the directions on se-r.net for cleaning the BPT valve.

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05 Legacy GT
93 NX2000 w/VE

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(O.o )
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nxer

Don't add alcohol, it is bad for your car. At work we use Everwear fuel system cleaner, which was originaly developed for Disney Land vehicles to solve their emmison problems.

Fonque

What does everwear do to help emissions, what do any of theose engine emission lower gas additives do??

paNX2K&SE-R

Retard your timing to 10* or less, change your oil, and install a 1" buttplug. You will pass with no prob.

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91 SE-R w/DET
02 G20 Sport 5spd
94 Miata "homobile"
93 240SX Family Project

"Any man who is under 30, and is not a liberal, has no heart; and any man who is over 30, and is not a conservative, has no brains." Winston Churchill

spnx

Note: this goes on the car's exhaust.

Good luck.

James

mpg9999

Haha, good note.

Retarding your timing will decrease nox, but it will increase your HC's. I'd say definatley clean out the EGR valve and make sure its working. A new cat will probably get you the rest of the way there, or perhaps the "buttplug" will work.

socalnx

Retarding the timing has saved my NOx numbers before.

The buttplug is new to me. I googled it and I got too many fetish results to make use of... How/where does this go exactly ?

Creagach

they may do a functional test as well and then you will fail timing, retarding your timing will decrease nox but increase hc and possibly co%, you need to functionally check your egr (via vacuum pump) and clean the pipe from the ex-manifold (or header) and egr itself, if the egr doesn't stall the vehicle when actuated you need to replace egr.
good luck and if they don't look under the car a second cat (if the first isn't clogged) will usually do the trick if everything else checks out.

Fonque

i checked the egr tube and all the other vacuum tubes for that matter. They are still functioning from the last time i cleaned them. If you push up on the egr diaphram, the car gets damn close to dying but never does but the idle drops condiderably. I will check and clean everything again but since I just bought a new egr about 1.5 years ago i dont think there is anything wrong with it. For now this will have to wait until after my wedding and honey moon coming up this weekend.

focalBlur

my car passed with no EGR at all, i say retard the timing a bit

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1993 Nissan Sentra SE-R
Soko motor, OBX header, HKS exhaust, clutchnet fibercarbon

Creagach

then you must not have functional,visual or nox tests there.
you're lucky, in cali we got it all.

Fonque

are there any vacuum lines that need to be rerouted if i remove the egr and get a block off plate?

TURBOSER1

Replace the CAT on the car.... I had the same problems and it turned out to be a blocked egr tube and the cat was shot...

Toolapcfan

Is there a list of states that do emissions testing? I want to make sure I never move to one.

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- Rob

Wicked White '08 EVO GSR "Jaws"

mpg9999

Its not always just states, its certain parts of states. For example most of virginia does not have emmisions. The part I live in (Northern VA) does.

kieranlavin

First, my condolenses regarding your emissions... I've got the same issues with my car. Secondly, you can check your EGR for proper operation by revving the car up while keeping your hand on the diaphragm. Don't push up on it like you reference above - instead, put your finger on it and see if it flutters around 3-4K RPM's (it should) If it doesn't, it may not be working properly. Also, make sure you clean out *ALL* of your EGR lines. There's a little one going from the BPT to the EGR (or vice versa... don't remember) that's really tiny and make sure that's cleaned.

Personally, I'd go the route of checking the entire EGR and other things before replacing the cat (as that's an expensive proposition and I did it when it was unnecessary!) Retarded timing does help but don't retard it too much as your HC will go up. Clean out the system... when was the last time you did a full tune-up? How about your fuel filter? Also, when you go for inspection, try to keep the cat hot... as long as it's working, it'll help. Run the car *HARD* just before you go in for testing. Avoid sitting in a big long line on the street like the plague! Go first thing in the morning if possible to avoid sitting in that big long line. If the car still doesn't pass after all of that, try a butt plug and then, after that, maybe a new cat. (the butt plug is actually a restrictor plate of sorts that you can put before the cat. I think 1/4" flat stock is minimum (smaller will blow out) and a 1/2" to 3/4" hole should work well. Be careful driving like this though... the car will not react "normal" This butt plug creates additional backpressure and opens your EGR much easier than normal)

Finally... my story. 5 years ago was my first run-in with nox issues. All of the mods were brand new on the car and it really pissed me off that I couldn't pass. The inspection station was right down the street from a dealer that I had a relationship with so they wound up helping me out and hooked up my EGR for full-time vacuum The last inspection, I failed and then went on a mission to find why I failed. I pulled all of the EGR components off the car and cleaned and checked them all. Literally, nothing belonging to the EGR system was on my car! It still failed. I enlisted the help of a few SE-R gods and they checked this that and the other and concluded that everything was fine. Still failed. I bought a new cat and the car still failed! Finally, we went the butt plug method and the car failed HC. It was way low on nox but way high on hc. The shop that I had brought it to (and paid extra because inspection is free in NJ unless you go to a private place) fiddled with it and got it to pass. When asked how they did it, the response was "don't worry about it" Fishy but I don't care as long as I have a passed emissions sticker!

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kieran
95 200SX SE-R track car, 02 Maxima SE, 08 FX45, 08 G37

tgvince

Just went thru this in my Turbo Classic. Retard the timing to about 10 deg AND change out your cat. I did the gass addative and the timing alone and failed...changed the cat and EVERYTHING cleaned up. Mostly the Nox though.

Terry
92 classic Disco powered.