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Old 06-18-2008, 01:58 PM   #1
sc2dohc94
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1994 SC2
Default NOx(ppm) Emission failure

ok i have a 94 sc2 dohc manual with 134k miles. new engine 4k miles ago, new trans 6k miles ago, new muffler 500mi (old one cracked), and new IACV 400mi ago.

i got my car inspected on 05/01/2008 it failed because muffler was cracked, brought back on 5/20/2008 and they would not accept because it was passed 15 days, which they failed to mention that rule to me. i got pulled over for the sticker yesterday (6/17/2008) so i took it to get inspected it failed because of NOx.
the following is the NOx results from 5/1/2008 and 6/17/2008
6/17/2008-(25mph) standard-1123 tested-1966 (15mph) standard-1242 tested-3814
5/1/2008-(25mph) standard-1123 tested-231 (15mph) standard-1242 tested-291
the only changes to the car in between the two tests was the muffler and the IACV. my best guess is the IACV is whats causing the problem. however i talked to a different inspection place and they looked up the causes for NOx to fail #1. o2 sensor #2. EGR valve or hose. are the top two reasons.

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Old 06-18-2008, 02:10 PM   #2
froggy81500
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2006 ION-2 Sedan
Default Re: NOx(ppm) Emission failure

NOx is mainly created from higher combustion chamber temperatures. This is the specific purpose for the EGR valve. As far as the IACV or the O2 sensors causing it, I doubt it. One question, does the car overheat, or seem to run hot? If so, this could be contributing to the high NOx readings.

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Old 06-18-2008, 02:43 PM   #3
sc2dohc94
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1994 SC2
Default Re: NOx(ppm) Emission failure

thank you very much for replying you dont know how much i apreciate it! they did say your car is trying to over heat on us and i told them to turn the air on in the car so the radiator fan would come on but they didn't do that..idiots. because it was at 3/4 when i got to the car 10 mins after they finished.... so i will make sure they dont let it get hot and im going to clean my egr for the first time.. that should help too...

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Old 06-18-2008, 03:10 PM   #4
froggy81500
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2006 ION-2 Sedan
Default Re: NOx(ppm) Emission failure

A couple things. If the ECTS is bad the cooling fans won't come on and eventually the car will overheat when left idling. My wife's '92 SL2 would do that until I tested the ECTS. Once I replaced it, no more overheating issues. The ECTS has to be by far the biggest headache with these cars. Or at least the most common. You may want to look at replacing that first before getting another inspection. Also, keep in mind the EGR valve does not function at idle, only during certain driving conditions. I am unsure of the procedures they do for emissions where you live, but here in NY they plug into the car's computer and let the car idle for a few minutes to test it. Obviously if your ECTS is bad and your car overheats and they emissions testing require it to be idling for a bit, you're going to keep getting the same results until you take care of the overheating.

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Old 06-19-2008, 08:58 AM   #5
sc2dohc94
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Default Re: NOx(ppm) Emission failure

Ok so I will replace the ECTS I guess because I know where it is and itís pretty cheap.... but I have a problem now... im going to start a separate thread for it but I cleaned my EGR and now my car wont start! It just turns over....then every once in a while it will start, idle shoots up, then dies. Is this happening because I started the car without the EGR on for a moment to see what happens? (Idle shot strait up and I turned off the car... obviously it just sucked air through that intake hole...) The car will not start with or without the EGR on... do I need to reset the PMC?

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Old 06-19-2008, 09:18 AM   #6
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Default Re: NOx(ppm) Emission failure

Check your gaskets. If it is leaking it will cause the idle to run high like that. I am suprised having it off wide open like that, that it started at all. I am not totally sure if you need to reset the pcm or not, but I suppose it can't hurt to do so. Look around for any disconnected vacuum lines also. Perhaps something got knocked loose when you pulled the EGR.

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Old 09-02-2009, 09:31 AM   #7
POS
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2001 SL
Default Re: NOx(ppm) Emission failure

My 01 Sl manual just failed high NOx yesterday at idle and at 25 mph, both near 1800 rpm (California test). First time ever even near failing. Still averaging 38 mpg on commute. I noticed that the coolant or engine temp was higher than I have ever seen it, at the half way point gauge as the test ended. The car sat and idled for I don't know, 20 minutes, before he started the test.

Can a high engine temp raise the NOx significantly ??

The vehicle has over 140,000 miles and original coolant. Maybe I change that first, no ??

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