Emissions CO Inspection Fail Texas - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > Emissions CO Inspection Fail Texas

Dana 30 Truss for your TJ, LJ, ZJ, and XJIntroducing MONSTALINER™ UV Permanent DIY Roll On Bed LineArtec JK Under Armor Bellypan

Reply
Unread 07-10-2011, 07:16 AM   #1
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   Reply With Quote
Unread 07-10-2011, 11:03 AM   #2
Collin89Sahara
Registered User
1989 YJ Wrangler 
 
Join Date: Jun 2011
Location: Frisco, Il
Posts: 1,375
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   Reply With Quote
Unread 07-10-2011, 11:29 AM   #3
Old4X
Registered User
1990 CJ7 
 
Join Date: Nov 2008
Location: Ga
Posts: 4,774
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.
__________________
Rust free YJ for sale. Need more room in barn.
Old4X is offline   Reply With Quote
Reply

Tags
emissions , inspection , motorcraft
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.