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Civic failed emissions testing: super-High Nox
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CarGuru > Honda > Civic failed emissions testing: super-High Nox 3 April 2005 07:51:27
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Civic failed emissions testing: super-High Nox

Lady via CarKB.com 2 April 2005 05:43:59
 Ok guys, please help a damsell in distress...
Got a 93 Civic Cx (5 spd hatchback), tried twice to e-test it, but failed.
Both times all the other readings were amazing, but Nox failed miserably
(do I really need to find the papers and give you the exact numbers?)
First time didn't do anything, and Nox were double the allowed, so I got a
new (3-way) cat put in, booked another test, run it for an hour to make
sure she was all warm and fuzzy and went in... this time Nox 4 times the
allowed!!! What's going on???!
I know, your'e going to suggest a faulty EGR valve, but my car doesn't have
one. So... maybe it be the rad? It's pretty raggedy...Or thermostat? (Still
original)
Anything else? It's got almost 260k on it, and the oil has been changed
every 5k, the engine is clean as a whistle.
It has a stainless steel exhaust and a custom made muffler, but those
shouldn't make a difference, should they?
Maybe my timing is off? Would there be any symptoms?
I'd really appreciate any advice; I hate it when they try to screw me over
just because I wear a skirt!

--
Message posted via http://www.carkb.co­m
Add comment
TeGGer® 2 April 2005 07:46:50 [ permanent link ]
 "Lady via CarKB.com" <forum@CarKB.com> wrote in
news:8cb9191c82e241­92a6bf7505e59e28c7@C­arKB.com:
Ok guys, please help a damsell in distress...> Got a 93 Civic Cx (5 spd hatchback), tried twice to e-test it, but> failed. Both times all the other readings were amazing, but Nox failed> miserably (do I really need to find the papers and give you the exact> numbers?)


It would help...

The idle test does not measure NO, but tests at speed do. We need to know
those results.


First time didn't do anything, and Nox were double the> allowed, so I got a new (3-way) cat put in, booked another test, run> it for an hour to make sure she was all warm and fuzzy and went in...


Did you IDLE it for an hour, or did you subject the car to a high-load
drive for an hour? BIG difference. And how long did it sit before they
actually had it running on the dyno?


this time Nox 4 times the allowed!!! What's going on???!> I know, your'e going to suggest a faulty EGR valve, but my car doesn't> have one.


That's right! Only the automatics got EGR.

So... maybe it be the rad? It's pretty raggedy...Or> thermostat? (Still original)> Anything else? It's got almost 260k on it, and the oil has been> changed every 5k, the engine is clean as a whistle.> It has a stainless steel exhaust and a custom made muffler, but those> shouldn't make a difference, should they? > Maybe my timing is off? Would there be any symptoms?> I'd really appreciate any advice; I hate it when they try to screw me> over just because I wear a skirt!>


Do you look good in the skirt? Just asking...(I'm already married
anyway...)

Nitric oxide emissions are caused by combustion temperatures that exceed
2,500deg F. If you're failing smog due to high NO, there are several
possible causes (the cat *apparently* having been ruled out):
1) Ignition timing too far advanced
2) Excessive combustion chamber deposits (unlikely unless car has been
woefully maintained)
3) Poor cooling (gauge reads high)
4) Lean combustion due to old or defective oxygen sensor
5) Lean combustion due to clogged injectors
6) Defective new cat (it happens!)


--
TeGGeR®

The Unofficial Honda/Acura FAQ
www.tegger.com/hond­afaq/
Add comment
Motsco_ _ 2 April 2005 10:20:57 [ permanent link ]
 Lady via CarKB.com wrote:> Ok guys, please help a damsell in distress...> Got a 93 Civic Cx (5 spd hatchback), tried twice to e-test it, but failed.> Both times all the other readings were amazing, but Nox failed miserably> (do I really need to find the papers and give you the exact numbers?)> First time didn't do anything, and Nox were double the allowed, so I got a> new (3-way) cat put in, booked another test, run it for an hour to make> sure she was all warm and fuzzy and went in... this time Nox 4 times the> allowed!!! What's going on???!> I know, your'e going to suggest a faulty EGR valve, but my car doesn't have> one. So... maybe it be the rad? It's pretty raggedy...Or thermostat? (Still> original)> Anything else? It's got almost 260k on it, and the oil has been changed> every 5k, the engine is clean as a whistle.> It has a stainless steel exhaust and a custom made muffler, but those> shouldn't make a difference, should they? > Maybe my timing is off? Would there be any symptoms?> I'd really appreciate any advice; I hate it when they try to screw me over> just because I wear a skirt!


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

Search this group to see if PCV is ever cited as a cause. I know it can
certainly whack out the idle, as well as sucking the oil out of your
engine / messing up the CAT.

P.S. Good idea to post to your existing threads, rather than starting
new ones each time. :-(­

'Curly'

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CarGuru > Honda > Civic failed emissions testing: super-High Nox 3 April 2005 07:51:27
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