Honda Car Forum


 

Go Back   Honda Car Forum - Accord Parts Civic Tuning Acura Racing > Honda Acura > Honda 2

Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 01 Apr 2005, 07:43 pm
Lady via CarKB.com
Guest
 
Posts: n/a
Default Civic failed emissions testing: super-High Nox

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
Reply With Quote
  #2 (permalink)  
Old 01 Apr 2005, 08:41 pm
Lady via CarKB.com
Guest
 
Posts: n/a
Default Or...what about the O2-sensor?

Wouldn't a faulty O2 sensor cause ALL of the readings to be high? (Not just
the Nox, like I have). And besides, I don't get any trouble codes.
Please don't tell me it's the head gasket?!! There is a little bit of white
smoke, but it doesn't smell sweet, so I'm assuming that's just condensation.
I've been surfing all day trying to get answers to my problem, and I sure
have learned a lot, but I'm still confused as to what is causing the high
NoX!!!Heeeelp!

--
Message posted via http://www.carkb.com
Reply With Quote
  #3 (permalink)  
Old 01 Apr 2005, 09:46 pm
TeGGer®
Guest
 
Posts: n/a
Default Re: Civic failed emissions testing: super-High Nox

"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/
Reply With Quote
  #4 (permalink)  
Old 01 Apr 2005, 11:24 pm
Lady via CarKB.com
Guest
 
Posts: n/a
Default Still here -found todays's result

At 40 km/h

Limit reading
HC ppm

--
Message posted via http://www.carkb.com
Reply With Quote
  #5 (permalink)  
Old 01 Apr 2005, 11:42 pm
Lady via CarKB.com
Guest
 
Posts: n/a
Default Shoot- let's try this again!

40 KM/ h
Limit Reading Result
HC ppm 82 11 pass
CO% 0.45 0.01 pass
No ppm 0636 2431 Fail (no kidding! ya' think?!)
RPM 1867 Valid
Dilution 14.51 Valid

Curb idle

HC ppm 200 8 pass
CO% 1 0.00 pass
NO ppm N/A N/A N/A
Rpm 744 Valid
Dilution 13.10 Valid

And before the test I drove it around a small strech of highway, then city
speeds, then it sat maybe 5 minutes idling. It took the guy about 10
minutes to hook the car up (why so long, i have no idea, he was standing
around scratching his head). Hope this helps! Thanks so much for all your
help!
I keep thinking it must be my O2 sensor (still orig.), but then again,
wouldn't it affect the other readings as well (+ cause a trouble code?)
So the maybe the rad, then? ....oy vey, I don't know what to do! Better
go to sleep now! Thank you again!

--
Message posted via http://www.carkb.com
Reply With Quote
  #6 (permalink)  
Old 02 Apr 2005, 12:20 am
motsco_ _
Guest
 
Posts: n/a
Default Re: Civic failed emissions testing: super-High Nox

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'

Reply With Quote
  #7 (permalink)  
Old 02 Apr 2005, 01:55 am
Randolph
Guest
 
Posts: n/a
Default Re: Shoot- let's try this again!


"Lady via CarKB.com" wrote:

<snip>

> I keep thinking it must be my O2 sensor (still orig.), but then again,
> wouldn't it affect the other readings as well (+ cause a trouble code?)
> So the maybe the rad, then? ....oy vey, I don't know what to do! Better
> go to sleep now! Thank you again!


If the O2 sensor indicates less O2 in the exhaust that what you really
have, then the ECU would respond by making the mixture leaner than
normal. Lean mixture means lowered HC and CO, and increased NOx.

There is an article on NOx failures at
http://www.aftermarketbusiness.com/a....jsp?id=106701

================================================== =====
A very modest collection of Honda tech info can be found at:
http://www.geocities.com/ng_randolph
Reply With Quote
  #8 (permalink)  
Old 02 Apr 2005, 07:37 am
TeGGer®
Guest
 
Posts: n/a
Default Re: Shoot- let's try this again!

Randolph <trash@junkmail.com> wrote in
news:424E501A.A940BD2B@junkmail.com:


>
> There is an article on NOx failures at
> http://www.aftermarketbusiness.com/a...ticle/articleD
> etail.jsp?id=106701




What an excellent link. I've bookmarked it.

It seems an exhaust leak can cause high NOx as well as an old/defective O2
sensor.

Interesting that the tech says cooling system problems and combustion
chamber deposits do not cause increases in emissions.


--
TeGGeR®

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/
Reply With Quote
  #9 (permalink)  
Old 02 Apr 2005, 02:06 pm
Lady via CarKB.com
Guest
 
Posts: n/a
Default Re: Civic failed emissions testing: super-High Nox

Well, I got a new o2 sensor put in this morning, got re-tested and she
passed no problem! Thank's everyone, I really appreciate all your help!
XO -Lady (who looks damn good in a skirt!)

--
Message posted via http://www.carkb.com
Reply With Quote
  #10 (permalink)  
Old 02 Apr 2005, 09:51 pm
Randolph
Guest
 
Posts: n/a
Default Re: Civic failed emissions testing: super-High Nox


"Lady via CarKB.com" wrote:

<snip>

> XO -Lady (who looks damn good in a skirt!)


Ah, come on; You can't write that and not post a picture!

--
================================================== =====
A very modest collection of Honda tech info can be found at:
http://www.geocities.com/ng_randolph
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
91 Acura Integra - High NOx - Failed emissions test - NJ sabys@hotmail.com Honda 3 3 09 Sep 2006 08:54 pm
92 accord failed smog high nox at 15 and 25 mph jules Honda 3 0 01 Sep 2006 04:30 pm
Fuel pressure testing 88 Civic CRX DX tich Honda 2 1 15 Jul 2005 10:34 pm
91 Honda failed emissions testy Honda 2 6 19 Mar 2005 03:37 pm
Apexi Super S-AFC-2 for Honda Civic Drew Cutter Honda 2 0 16 Mar 2005 02:55 pm


All times are GMT -5. The time now is 08:39 pm.


Attribution:
Honda News | Autoblog
Powered by Yahoo Answers




Powered by vBulletin®
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.
HondaCarForum.com is not affiliated with Honda Motor Company in any way. Honda Motor Company does not sponsor, support, or endorse HondaCarForum.com in any way. Copyright/trademark/sales mark infringements are not intended or implied.