AcuraLegend.Org - The Acura Legend Forum for All Generations of the Honda / Acura Legend; 1986 to Present  

Go Back   AcuraLegend.Org - The Acura Legend Forum for All Generations of the Honda / Acura Legend; 1986 to Present > Second Generation Legend -- 1991 - 1995 > 2nd Gen. Legend General Discussion

Reply
 
Thread Tools Display Modes
Old 06-27-2012, 03:07 PM   #11
Quaraxkad
Moderator?
 
Quaraxkad's Avatar
 
Join Date: Jun 2009
Location: Port Orange, FL
Posts: 3,944


Quaraxkad is a glorious beacon of lightQuaraxkad is a glorious beacon of lightQuaraxkad is a glorious beacon of lightQuaraxkad is a glorious beacon of lightQuaraxkad is a glorious beacon of lightQuaraxkad is a glorious beacon of light
Send a message via AIM to Quaraxkad
Default

Quote:
Originally Posted by Chrispy View Post
Maybe if the tube was clogged, then yeah it wouldn't throw a cel. Bit of the egr itself were clogged, the valve would get stuck and throw a cel.
It's hard to imagine the valve itself being so clogged that it can't close, in part because since the buildup happens a tiny bit at a time, every time the valve opens and closes again will free it up because it hasn't had the time to dry and harden. It's certainly not an impossibility that the buildup is interfering with the operation of the valve, though it's not commonly known to happen. On the other hand, if you own a Legend, and you have not personally had the EGR pipe and manifold cleaned, let's be honest: It's probably clogged, in at least the pipe.

Having no experience with emissions testing though (yay Florida!), I'd not pick out any individual component to say "this is why your X readings are too high". Regardless, it's best to find all contributing factors rather than just the one that puts you over the edge.

Last edited by Quaraxkad; 06-27-2012 at 03:11 PM.
Quaraxkad is offline   Reply With Quote
Old 06-27-2012, 03:17 PM   #12
rwheadon
S*L*O*W
 
rwheadon's Avatar
 
Join Date: Aug 2010
Location: Atlanta, GA
Posts: 3,268




Real Name: Rich
rwheadon is a jewel in the roughrwheadon is a jewel in the roughrwheadon is a jewel in the rough
Default

my experience on my 91 coupe:

* Replaced the cat and it did virtually nothing - I think general consensus is they do very little.
* Cleaned out the EGR tube and manifold ports - cut NOx in half... still too high
* Replaced both O2 sensors, NOx passed great.

Not related to NOx but another battle on the same year... I also was fighting one of the readings due to the valve stem seals leaking, which completely cleared up once I replaced them.

rich
__________________

* Your smoking 3.2 engine is probably ok... replace your valve guide seals before condemning it!
rwheadon is offline   Reply With Quote
Old 06-27-2012, 04:22 PM   #13
Alperovich
The Stig
 
Alperovich's Avatar
 
Join Date: Jun 2009
Location: North Port,FL
Posts: 10,651


Real Name: The Stig
Alperovich is a jewel in the roughAlperovich is a jewel in the roughAlperovich is a jewel in the roughAlperovich is a jewel in the rough
Default

Quote:
Originally Posted by Quaraxkad View Post
It's hard to imagine the valve itself being so clogged that it can't close, in part because since the buildup happens a tiny bit at a time, every time the valve opens and closes again will free it up because it hasn't had the time to dry and harden. It's certainly not an impossibility that the buildup is interfering with the operation of the valve, though it's not commonly known to happen. On the other hand, if you own a Legend, and you have not personally had the EGR pipe and manifold cleaned, let's be honest: It's probably clogged, in at least the pipe.

Having no experience with emissions testing though (yay Florida!), I'd not pick out any individual component to say "this is why your X readings are too high". Regardless, it's best to find all contributing factors rather than just the one that puts you over the edge.
i;ve seen en stuck plenty of times. also typically the electrial portion wears out thou
__________________

94 KA8 DMM LS 6spd "MISTY" 2017-present
94 KA8 Milano LS 6spd "Milano" 2012-2017 RIP stupid camry
94 KA8 SGM LS 6spd "Annie" 2008-???*top secret*
94 KA7 DMM GS auto "Misty" 2008 RIP
93 KA8 GBP LS 6spd 2005-2008 RIP

FOR SALE:dotORG + I<3myLegend(KA/KB) stickers! +more
Alperovich is offline   Reply With Quote
Old 06-27-2012, 06:39 PM   #14
sr5guy
Troll Hunter
 
sr5guy's Avatar
 
Join Date: Jun 2009
Location: CT
Posts: 2,868

Real Name: Matt W.
sr5guy is a name known to allsr5guy is a name known to allsr5guy is a name known to allsr5guy is a name known to allsr5guy is a name known to allsr5guy is a name known to all
Default

Quote:
Originally Posted by Chrispy View Post
Maybe if the tube was clogged, then yeah it wouldn't throw a cel. Bit of the egr itself were clogged, the valve would get stuck and throw a cel. I still don't see the egr alone causing that high of a nox gas value. Egr would probably be the 2nd to last thing I would check.
Chrispy, you gotta read my HG thread again! They always clog uip and the valves nearly never get stuck. No matter how clogged the pipe is, it won't throw a code - that's the flaw in the system. His symptoms are 110% indicative of a clogged EGR system.

-Matt
__________________
sr5guy is offline   Reply With Quote
Old 06-27-2012, 09:10 PM   #15
Chrispy
Pisser of Parades
 
Chrispy's Avatar
 
Join Date: Jun 2009
Location: Milwaukee, WI
Posts: 8,550
Real Name: Chrisp
Chrispy is a glorious beacon of lightChrispy is a glorious beacon of lightChrispy is a glorious beacon of lightChrispy is a glorious beacon of lightChrispy is a glorious beacon of lightChrispy is a glorious beacon of light
Default

Quote:
Originally Posted by sr5guy View Post
Chrispy, you gotta read my HG thread again! They always clog uip and the valves nearly never get stuck. No matter how clogged the pipe is, it won't throw a code - that's the flaw in the system. His symptoms are 110% indicative of a clogged EGR system.

-Matt
Ah, yes, the fatal flaw in the matrix....

And it cant be the extra 10%, cuz thats like, made up and stuff...just sayin

And yeah I should read it again. I need to brush up Im gettin sloppy here
__________________
Quote:
Originally Posted by Chrispy
If by some chance I have given you the impression that I care or that I give a f&%k, be advised that this user does, in fact, give less than a fraction of a f&%k what you think. Zero f&%ks have been given by this user in this post. Have a nice day

Chrispy is offline   Reply With Quote
Old 06-27-2012, 10:30 PM   #16
ari_one
MeltingInTheSun
 
ari_one's Avatar
 
Join Date: Jun 2009
Location: Phoenix
Posts: 2,178

ari_one will become famous soon enough
Default

Didn't have any CEL's for the O2's or anything else.
__________________
Parting out 4 91 L Sedans (mostly type 'F', some type 'E') and 93 Coupe type 'E':
https://docs.google.com/spreadsheets...it?usp=sharing

ari_one is offline   Reply With Quote
Old 06-28-2012, 06:06 AM   #17
rwheadon
S*L*O*W
 
rwheadon's Avatar
 
Join Date: Aug 2010
Location: Atlanta, GA
Posts: 3,268




Real Name: Rich
rwheadon is a jewel in the roughrwheadon is a jewel in the roughrwheadon is a jewel in the rough
Default

Quote:
Originally Posted by ari_one View Post
Didn't have any CEL's for the O2's or anything else.
Ya, my O2 sensors weren't throwing codes either... if you have to pass a sniff test you are going to fail long before the ECU knows the O2 sensors are bad... just one of those things.

rich
__________________

* Your smoking 3.2 engine is probably ok... replace your valve guide seals before condemning it!
rwheadon is offline   Reply With Quote
Old 06-28-2012, 09:38 AM   #18
sap
ignore the smoke
 
sap's Avatar
 
Join Date: Jun 2009
Location: Edmonton, AB, Canada
Posts: 1,545



sap will become famous soon enough
Send a message via AIM to sap
Default

EGR is always suspect in high NOx readings because hydrocarbon combustion in air (in general, not just in engines) produces NOx at high combustion temperatures. EGR is meant to cool the combustion and reduce that, reducing the burden on the cat.

The O2 sensors are important because the cat won't work properly if the mixture isn't right, if the exhaust gas is too lean (too much oxygen left) the cat won't be able to reduce the NOx properly (IIRC ...)
__________________

Sig by Cole Austin
RIP Fut RIP l4zy
Stop by the unofficial Acura Legend IRC channel: Rizon #acuralegend.org
Check out the Acura Legend Wiki!
sap is offline   Reply With Quote
Old 06-28-2012, 02:27 PM   #19
abathur
Junior Member
 
Join Date: Jun 2012
Posts: 5
abathur is on a distinguished road
Default

A forum member PMed me a shop recommendation in the area and they sounded like they know what they're doing. I think I'll order a pair of O2 sensors, get the EGR system checked at the recommended shop, and then take another shot at passing the emissions test.

Wish me luck. Not going to take it in until Monday, so I'll keep an eye out until then for any other thoughts. Thanks all for your input.
abathur is offline   Reply With Quote
Old 06-29-2012, 07:26 AM   #20
sr5guy
Troll Hunter
 
sr5guy's Avatar
 
Join Date: Jun 2009
Location: CT
Posts: 2,868

Real Name: Matt W.
sr5guy is a name known to allsr5guy is a name known to allsr5guy is a name known to allsr5guy is a name known to allsr5guy is a name known to allsr5guy is a name known to all
Default

Quote:
Originally Posted by abathur View Post
A forum member PMed me a shop recommendation in the area and they sounded like they know what they're doing. I think I'll order a pair of O2 sensors, get the EGR system checked at the recommended shop, and then take another shot at passing the emissions test.

Wish me luck. Not going to take it in until Monday, so I'll keep an eye out until then for any other thoughts. Thanks all for your input.
Don't waste your money on o2 sensors if you not getting a code for them. The Legend' o2 sensors are very robust. Clean out the EGR system and you will be golden.

-Matt
__________________
sr5guy is offline   Reply With Quote
Reply

Bookmarks

Tags
egr, emissions, nox


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 On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
cleaning 02 sensors failed Conrad 2nd Gen. Legend General Discussion 10 08-21-2011 09:43 PM
Acura legend crash test ( g2 ) Tippey The Water Cooler 12 06-01-2011 11:21 AM
My Legend Failed Me LegendaryAffinity 1st Gen. Legend General Discussion 18 11-26-2010 10:52 PM
Failed state emissions test Tm1 1st Gen. Legend General Discussion 6 10-24-2010 06:51 AM
FAILED emissions due to NO SickSUN71 2nd Gen. Legend General Discussion 9 01-03-2010 06:48 PM


All times are GMT -7. The time now is 05:24 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.

AcuraLegend.Org is not affiliated with, nor represents in any form, Acura and Honda Motor Company. Some logos and names used herein remain the trademark of Honda Motor Company.