Help! Failed Emissions..... Again..... - JeepForum.com
 3Likes
Reply
 
LinkBack Thread Tools
post #1 of 21 Old 06-04-2018, 01:01 PM Thread Starter
crsimons
Registered User
1993 YJ Wrangler 
 
Join Date: Feb 2016
Location: Logan
Posts: 24
Garage
Help! Failed Emissions..... Again.....

Greetings,

I recenlty moved out to Utah and am now subject to stricter emissions than I was previously. I went in for my test and failed the idle originally with a CO% reading of 3.11 (over by 1.91, standard is 1.20). I sea foamed it for 24 hrs, changed the oil/oil filter, added engine cleaner (and drove it til empty, refilled) and changed the air filter. I took it back and failed my idle again but this time only over by 0.09. Does anyone have any advice for what to check/clean/fix in order to bring it under so I can get my utah license plates?

crsimons is offline  
Sponsored Links
Advertisement
 
post #2 of 21 Old 06-04-2018, 01:19 PM
Chrisnvegas
Web Wheeler
 
Chrisnvegas's Avatar
1992 YJ Wrangler 
 
Join Date: Dec 2012
Location: Nevada Territory
Posts: 8,543
Maybe try a set of Champion Copper Plus plugs.

That & they have this "stuff" at the parts store called Guaranteed to Pass® Emissions Test Formula,
Pass or double your money back.

No smog where I live so don't know if the stuff works. I have heard it sometimes does.
You're so close, might just do it.
Yeah not a real fix but if it passes, it'll buy time to fix it right over the next year.

A Law repugnant to the Constitution is void. Marbury vs. Madison 1803 I'm talking to you, Virginia...
Chrisnvegas is offline  
post #3 of 21 Old 06-04-2018, 01:53 PM
jtec
Web Wheeler
 
jtec's Avatar
2014 JK Wrangler 
 
Join Date: Oct 2017
Posts: 7,539
this is a 1993 wrangler?


first thoughts:
Is engine reaching temp? you are using a @195 degrees T'stat?
Plugs - there is only 4 and removing to inspect - I would REPLACE - use correct plugs.


Was anything printed out - results for other readings?
Map sensor - o2 sensor - TPS ?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
jtec is offline  
 
post #4 of 21 Old 06-04-2018, 03:12 PM Thread Starter
crsimons
Registered User
1993 YJ Wrangler 
 
Join Date: Feb 2016
Location: Logan
Posts: 24
Garage
Its a '93. The printout has my High Speed and Idle Readings as well as a visual inspection of gas cap and visible smoke. My T-Stat is @195. Ill check my spark plugs when i get home. Was thinking about redoing the tail pipe o2 sensor seeing I don't think I have ever changed it in the 15 years since purchasing it
crsimons is offline  
post #5 of 21 Old 06-04-2018, 03:21 PM
jonnygranada
Registered User
1992 YJ Wrangler 
 
Join Date: Dec 2016
Location: Sandy Creek
Posts: 159
Probably not much help, but I believe what jtec said is right in line with your problem solver. If I remember right, if you are failing on CO% it usually means that you are running a little rich. So new plugs would definitely help. A trick I used during my years in CA was to run a hotter plug than was required for the vehicle. This would allow for more fuel to burn and get a cleaner exhaust if you will.... Also try using a nonethanol fuel, it burns a little more efficiently and being that you are in Utah I would assume most gas there is 10% ethanol unless it is 91 or better.

As for the "Stuff" mentioned earlier, I used it a couple of times and as scary as it may sound, for as bad as it smells it has always worked in my questionable vehicles. I never left any fluids in the vehicles when I used it though, so I don't know what the long term effects of it are.....

Good luck!

Side note, most states are different in their smog/emissions checks, like here in NY they go strictly by sensors now since it is mixed in with the yearly inspection. It might be helpful to mention how the test is preformed. IE on a dyno or not, or just a simple sniffer test ect….
jonnygranada is offline  
post #6 of 21 Old 06-04-2018, 04:00 PM
Chrisnvegas
Web Wheeler
 
Chrisnvegas's Avatar
1992 YJ Wrangler 
 
Join Date: Dec 2012
Location: Nevada Territory
Posts: 8,543
Quote:
Originally Posted by jonnygranada View Post
Probably not much help, but I believe what jtec said is right in line with your problem solver. If I remember right, if you are failing on CO% it usually means that you are running a little rich. So new plugs would definitely help. A trick I used during my years in CA was to run a hotter plug than was required for the vehicle. This would allow for more fuel to burn and get a cleaner exhaust if you will.... Also try using a nonethanol fuel, it burns a little more efficiently and being that you are in Utah I would assume most gas there is 10% ethanol unless it is 91 or better.

As for the "Stuff" mentioned earlier, I used it a couple of times and as scary as it may sound, for as bad as it smells it has always worked in my questionable vehicles. I never left any fluids in the vehicles when I used it though, so I don't know what the long term effects of it are.....

Good luck!



Side note, most states are different in their smog/emissions checks, like here in NY they go strictly by sensors now since it is mixed in with the yearly inspection. It might be helpful to mention how the test is preformed. IE on a dyno or not, or just a simple sniffer test ect….


Yeah, and get the engine real hot before the test. No short trip to the smog station and minimal idling before the test.

Heat that b**** up

A Law repugnant to the Constitution is void. Marbury vs. Madison 1803 I'm talking to you, Virginia...
Chrisnvegas is offline  
post #7 of 21 Old 06-04-2018, 04:10 PM
Chrisnvegas
Web Wheeler
 
Chrisnvegas's Avatar
1992 YJ Wrangler 
 
Join Date: Dec 2012
Location: Nevada Territory
Posts: 8,543
These are the plugs the engine is designed to run with.

Champion RC12LYC (412) Copper Plus

Running other plugs may have bad results.
These are the best "sparking" plugs out there.
Platinum plugs and splitfire plugs don't spark any better, they're designed for people who don't maintain their vehicles and the split fires are a gimmick.

"Platinum and Iridium plugs perform at a lower level than copper spark plugs, because they are less conductive and they tend to overheat. However, the overall longevity of these two types of metal is better than copper plugs. In reality, copper has the best performance of all three and the worst longevity"

So if you don't remember changing your plugs or are not running the Champion Coppers, replace them.

A Law repugnant to the Constitution is void. Marbury vs. Madison 1803 I'm talking to you, Virginia...
Chrisnvegas is offline  
post #8 of 21 Old 06-05-2018, 01:49 PM Thread Starter
crsimons
Registered User
1993 YJ Wrangler 
 
Join Date: Feb 2016
Location: Logan
Posts: 24
Garage
Alright, I installed the spark plugs, new wires (other ones pulled out) and new distributor cap. Going back after work for round 3! Thanks all for the suggestions. Ill let you know the results.
crsimons is offline  
post #9 of 21 Old 06-05-2018, 02:35 PM
jtec
Web Wheeler
 
jtec's Avatar
2014 JK Wrangler 
 
Join Date: Oct 2017
Posts: 7,539
was there any tells on plugs? wet, dry, black, tan. oiled, broken?
Chrisnvegas likes this.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
jtec is offline  
post #10 of 21 Old 06-06-2018, 07:00 AM Thread Starter
crsimons
Registered User
1993 YJ Wrangler 
 
Join Date: Feb 2016
Location: Logan
Posts: 24
Garage
The plugs looked an and dry. Ended up failing again. The guy suggested redoing my timing. Any thoughts?
crsimons is offline  
post #11 of 21 Old 06-06-2018, 07:10 AM
Chrisnvegas
Web Wheeler
 
Chrisnvegas's Avatar
1992 YJ Wrangler 
 
Join Date: Dec 2012
Location: Nevada Territory
Posts: 8,543
Did you heat the crap out of it and not idle much?
I think our computer sets the timing.

That's why I suggested that stuff too.

A Law repugnant to the Constitution is void. Marbury vs. Madison 1803 I'm talking to you, Virginia...
Chrisnvegas is offline  
post #12 of 21 Old 06-06-2018, 07:27 AM
campingDan
Registered User
 
Join Date: May 2018
Posts: 115
You replaced air filter?
Checked oxygen sensor?
MAP, TPS, ECT sensors?



Sent from my SM-G935V using Tapatalk
campingDan is offline  
post #13 of 21 Old 06-07-2018, 03:39 PM Thread Starter
crsimons
Registered User
1993 YJ Wrangler 
 
Join Date: Feb 2016
Location: Logan
Posts: 24
Garage
I drove for 30 minutes at highway speeds. 55+. Air filter is brand new. Haven't checked the o2 sensor/MAP/TPS/ ECT sensors. Will do those next.
crsimons is offline  
post #14 of 21 Old 06-07-2018, 05:16 PM
shaggyjim
NARF!
 
shaggyjim's Avatar
1992 YJ Wrangler 
 
Join Date: Nov 2008
Location: Grand Junction
Posts: 2,534
Check you exhaust manifold real close. They like to crack a lot and even a small crack upstream of the O2 sensor will cause you trouble.
When I lived in Denver and had to smog check my jeep I would run the tank down to empty and then run E-85 for the test. Most times they had to restart the test computer because it would say "no vehicle detected"
It did however always pass by a large margin.

Jim...


......YJOTM June 18......
shaggyjim is offline  
post #15 of 21 Old 06-07-2018, 07:02 PM
Chrisnvegas
Web Wheeler
 
Chrisnvegas's Avatar
1992 YJ Wrangler 
 
Join Date: Dec 2012
Location: Nevada Territory
Posts: 8,543
Use that crap!

A Law repugnant to the Constitution is void. Marbury vs. Madison 1803 I'm talking to you, Virginia...
Chrisnvegas is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may 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 On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome