Just failed emissions twice - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 07-09-2006, 04:47 PM   #1
Driving on E
 
Matt Timion's Avatar
 
Join Date: Sep 2005
Posts: 3,110
Country: United States
Just failed emissions twice

My wife's CRX is due for renewal. We took it in for emissions and safety the other day. The emissions as 10mph passed, but failed at 25mph. It failed on the NOx, and was over by around .3 (should be .9, read at 1.2).

I replaced the sparkplugs, warmed up the car and took it back.

This time it was over 2.0 at both 10mph and 25mph. It was also overheating like crazy. YOu try driving home with the heater on in 90+ degree weather in the desert... argh.


Anyway, the next shot is to replace the o2 sensor. I'll use the one from my civic as I don't need it any more. The guy said that my new plugs might not be gapped properly, but I was hoping that wasn't the issue b/c I bought the "pre-gapped" ones. That's what I get for spending extra money on spark plugs.

Can anyone think of what might cause high NOx emissions? Is it possible that it's time for a new catalytic converter?
__________________

Matt Timion is offline   Reply With Quote
Old 07-09-2006, 04:49 PM   #2
*shrug*
 
Join Date: Sep 2005
Posts: 6,195
Country: United States
Is it possible to give her your second cat when you hook up your test pipe?
__________________

SVOboy is offline   Reply With Quote
Old 07-09-2006, 04:56 PM   #3
Registered Member
 
GasSavers_maxc's Avatar
 
Join Date: Apr 2006
Posts: 166
Country: United States
Quote:
Originally Posted by Matt Timion
My wife's CRX is due for renewal. We took it in for emissions and safety the other day. The emissions as 10mph passed, but failed at 25mph. It failed on the NOx, and was over by around .3 (should be .9, read at 1.2).

I replaced the sparkplugs, warmed up the car and took it back.

This time it was over 2.0 at both 10mph and 25mph. It was also overheating like crazy. YOu try driving home with the heater on in 90+ degree weather in the desert... argh.


Anyway, the next shot is to replace the o2 sensor. I'll use the one from my civic as I don't need it any more. The guy said that my new plugs might not be gapped properly, but I was hoping that wasn't the issue b/c I bought the "pre-gapped" ones. That's what I get for spending extra money on spark plugs.

Can anyone think of what might cause high NOx emissions? Is it possible that it's time for a new catalytic converter?
Is the egr valve working. That's for NOx.
__________________
less lurking and more working
GasSavers_maxc is offline   Reply With Quote
Old 07-09-2006, 05:03 PM   #4
Driving on E
 
Matt Timion's Avatar
 
Join Date: Sep 2005
Posts: 3,110
Country: United States
Quote:
Originally Posted by SVOboy
Is it possible to give her your second cat when you hook up your test pipe?
I was actually just thinking about that. I might do it if the next plan fails.

High NOx apparently means it's running lean, which is also shown by it always overheating. Perhaps the new O2 sensor will fix it. Thanks for the 411 bagpipe goatee.
Matt Timion is offline   Reply With Quote
Old 07-09-2006, 05:04 PM   #5
Driving on E
 
Matt Timion's Avatar
 
Join Date: Sep 2005
Posts: 3,110
Country: United States
Quote:
Originally Posted by maxc
Is the egr valve working. That's for NOx.
I'm unsure if they had EGR valves in 87. Since my 89 doesn't have one I think they didn't have EGR valves. I'll double check though.
Matt Timion is offline   Reply With Quote
Old 07-09-2006, 05:07 PM   #6
*shrug*
 
Join Date: Sep 2005
Posts: 6,195
Country: United States
The only civics that got egr until 01 were the FE models, and I think the crx is an si, so I doubt it'd have it.
SVOboy is offline   Reply With Quote
Old 07-09-2006, 05:16 PM   #7
Registered Member
 
krousdb's Avatar
 
Join Date: Feb 2006
Posts: 1,480
Country: United States
Location: Raleigh, NC
Clogged injector? Low fuel pressure?
__________________


krousdb is offline   Reply With Quote
Old 07-09-2006, 05:24 PM   #8
*shrug*
 
Join Date: Sep 2005
Posts: 6,195
Country: United States
Hey, I suggested low FP also!

Anyway, I hope I live to be old enough to see a clogged injector on a honda, but Iono, seems improbable,
SVOboy is offline   Reply With Quote
Old 07-09-2006, 08:44 PM   #9
Registered Member
 
GasSavers_Ryland's Avatar
 
Join Date: Mar 2006
Posts: 1,325
Country: United States
Send a message via AIM to GasSavers_Ryland
the 180F thermostats are stock for reduced nox emissions, if you are running a 192 thermostat for better mpg it's going to hamper your emissions test.

the side gaped/pregaped plugs don't alwas agree with honda's, I've had best luck with NGK plugs, they only last 15,000 miles, but the copper core conducts better then platnum, altho platnum never wears out.

try running some fuel system cleaner if you haven't already.

if you have an EGR valve it will be listed on yoru under hood lable, my 85 crx hf has an egr valve, along with my 84 civic hatch back.
GasSavers_Ryland is offline   Reply With Quote
Old 07-09-2006, 09:48 PM   #10
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
Also, is it running hot because it's lean, or is it lean because it's running hot? If you know what I mean.
__________________

MetroMPG is offline   Reply With Quote
Reply

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 Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
UK MPG Added pb Fuelly Web Support and Community News 5 01-28-2014 09:07 PM
Average MPH instead of city/highway miles jg91 Fuelly Web Support and Community News 2 09-13-2011 03:31 AM
SMS Problem kernk Fuelly Web Support and Community News 2 02-27-2011 10:36 PM
Incorrect Milage Calcuatlion PatM Fuelly Web Support and Community News 4 07-17-2009 08:21 PM
Imperial/Metric choices for both distance and volume (separated out) robertstokes Fuelly Web Support and Community News 7 08-22-2008 10:54 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 03:04 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.