Emissions CO Inspection Fail Texas - JeepForum.com

 
LinkBack Thread Tools
post #1 of 3 Old 07-10-2011, 07:16 AM Thread Starter
coyoteboy76063
Registered User
1989 YJ Wrangler 
 
Join Date: Jul 2007
Location: Mansfield, TX
Posts: 16
Emissions CO Inspection Fail Texas

I failed inspection on the CO readings. Here is a breakdown: HC 190 High Speed and 182 Low Speed (Pass). C0(%) 3.53 High Speed and 2.98 Low Speed (Both Failed). C02 (%) 12.1 High and 12.5 Low. 02 (%) 0.2 High Speed and 0.2 Low Speed. NOx (ppm) 882 High and 1122 Low (Pass). Dilution (%) 15.6 High Speed and 15.5 Low Speed.

I put a Motorcraft carb on since last inspection. I think the cat and PCV valve is still good and the jeep has NEVER run better than it does now. Of course with the Motorcraft carb just about all of the vacuum lines went into the trash can.

The only weird thing going on with the jeep is a high pitched whistling sound when the jeep initially accelerates under load. Almost can't be a vacuum leak unless it's in the throttle body somewhere. I may have a manifold leak? Who knows, and if it's not related to the CO reading then I can live with it at this point.

Can anybody give me a checklist of things to try?

Thanks you for your help.

coyoteboy76063 is offline  
Sponsored Links
Advertisement
 
post #2 of 3 Old 07-10-2011, 11:03 AM
Collin89Sahara
Registered User
1989 YJ Wrangler 
 
Join Date: Jun 2011
Location: Frisco
Posts: 1,377
Make sure your emissions test was an ASM instead of a 2 speed idle. With the idle test you will fail miserably. (I know from experience and I live north of Dallas btw).
Collin89Sahara is offline  
post #3 of 3 Old 07-10-2011, 11:29 AM
Old4X
Registered User
1990 CJ7 
 
Join Date: Nov 2008
Location: Ga
Posts: 5,145
Try rejetting to the next smaller jet size. When you re-tune tthe carb, set the idle 50 rpms on the lean side of peak.

Make sure your EGR system is working.

Get an air filter that has the proper flow rate for that engine.

Put an OEM spec thermostat in the cooling system.

Fix your vacuum leak, a whistle is telling you there is one.

If you don't know the Cat's history, get a new one.

Change the oil just before your next inspection.

418 miles on 19 gallons of gas. Can't beat the BBD !
Old4X is offline  
Reply

Tags
emissions , inspection , motorcraft

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









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




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



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
93 Wrangler Az emissions 'pressure test' fail toddsdaler YJ Wrangler Technical Forum 10 05-05-2011 02:25 PM
Texas Vehicle Inspection Wrangler Mud Flaps lecharbon Wrangler General Discussion 12 11-22-2010 04:59 PM
Texas state inspection-houston help gsxr750 YJ Wrangler Technical Forum 2 04-22-2009 09:09 PM
bad u joint, fail inspection? Anonymous6915 YJ Wrangler Technical Forum 8 02-26-2009 08:39 AM
emissions inspection hguffman YJ Wrangler Technical Forum 10 10-26-2004 06:42 PM

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