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12-26-2009, 11:48 AM
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#2 | | Everyone wants a piece of R S...
Join Date: Mar 2007 Location: Surrey/Richmond
Posts: 365
Thanked 40 Times in 31 Posts
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NOx is hard to diagnose, could be alot of things, the easiest way to fix things like that, is to put a high flow cat in the exhaust system and send it through with retarted timing, should pass with flying colors after that :P
__________________
2002 Nissan Sentra SpecV - 2.5L 6 Speed FTW
1974 Chevy Vega Wagon --> RaceCar!
1968 Pontiac Firebird Sprint --> 4.1L I6!
Street Car --> 15.45 | Vega --> 11.65
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12-26-2009, 06:26 PM
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#3 | | My homepage has been set to RS
Join Date: Jun 2008 Location: Nowhere
Posts: 2,294
Thanked 848 Times in 392 Posts
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I failed NOx, I just cleaned my MAF Sensor, Housing, and changed Air Filter, and gave it a good 10 minute run and timed it so I would not have to be waiting at the AirCare Centre.
But yeah, NOx can be a bunch of things, just a matter of narrowing things down.
The EGR Valve is definitely a suspect.
What I would do is, get a mechanic that you trust, or knows the 240sx very well, and get him/her to inspect it thoroughly. If mechanically-wise, the car is perfect, then I see no reason for the car to not pass AirCare.
It could just be a simple tune-up, and cleaning.
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12-27-2009, 07:57 AM
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#4 | | Banned By Establishment
Join Date: Mar 2002 Location: 604
Posts: 4,015
Thanked 475 Times in 285 Posts
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if there are other options, like other cars, I would look at them first
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01-02-2010, 06:28 PM
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#5 | | OMGWTFBBQ is a common word I say everyday
Join Date: Nov 2005 Location: Vancouver
Posts: 6,044
Thanked 315 Times in 149 Posts
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i would just buy the one in my sig, with no problems. except that it has a KA
__________________ 1996 Honda Accord 1995 Nissan 240sx 2004 Infiniti G35 2005 Honda Jazz BuySell Feedback Quote: |
"It's called Sex Panther by Odeon. It's illegal in nine countries... Yep, it's made with bits of real panther, so you know it's good ... They've done studies, you know. 60% of the time it works, every time. "
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01-02-2010, 08:31 PM
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#6 | | Oh goodie, 5 posts already!
Join Date: Jan 2010 Location: vancouver
Posts: 5
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go for it
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01-02-2010, 10:04 PM
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#7 | | not the mod you're looking for
Join Date: Sep 2009
Posts: 3,743
Thanked 1,537 Times in 556 Posts
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Did the owner say it bombed Air Care? If that's the case, try getting the previous Air Care readings. Depending on what's bombing and how bad it bombed certain areas, you can usually gauge where the problem lies. For example, if it's hydrocarbons, it could be the cat. If it's nitrous oxides, it could be timing or even the EGR valve.
In all honesty, air care shouldn't be a big problem if you're planning on tuning your car  BUT, keep looking!
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01-06-2010, 08:42 AM
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#8 | | Oh goodie, 5 posts already!
Join Date: Jun 2006 Location: Burnaby BC.
Posts: 6
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Common problem withe the 240's are the tube from the EGR transducer burning through, easy and cheap fix. If it only failed NOx you'd be fine, sounds like a cool project. I'd buy it if i didn't already have like 3 cars.
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