failed echeck today high NOx - Page 2 - JeepForum.com
Reply
 
LinkBack Thread Tools
post #16 of 33 Old 03-13-2014, 12:25 PM
Louie4
Rickety Wrecked Son!
 
Louie4's Avatar
1993 YJ Wrangler 
 
Join Date: Aug 2008
Location: Raleigh
Posts: 10,564
Fixing the CCV (Closed Crankcase Ventilation) system may help. The back hose on the valve cover goes to a port on the intake. The front is a fresh air inlet going to the air box.


Lou

I have a jeep...and it is modified...I win.

YJOTM July 2012
YJOTM February 2014

Louie4's YJ Build
Poison Spyder Fender Install
Warn M8000 Rebuild Adventure
University of Georgia
Louie4 is offline  
Sponsored Links
Advertisement
 
post #17 of 33 Old 03-13-2014, 04:29 PM Thread Starter
langwilliams
Registered User
1995 YJ Wrangler 
 
Join Date: Feb 2014
Location: Lorain
Posts: 397
could someone post a pic of what the vac lines off the rear of the valve cover on the 4.0 is supposed to look like? thanks.
langwilliams is offline  
post #18 of 33 Old 03-13-2014, 04:32 PM Thread Starter
langwilliams
Registered User
1995 YJ Wrangler 
 
Join Date: Feb 2014
Location: Lorain
Posts: 397
here's what I have:

langwilliams is offline  
post #19 of 33 Old 03-13-2014, 08:32 PM
plym49
Registered User
1990 YJ Wrangler 
 
Join Date: Jan 2009
Location: NA
Posts: 1,584
Quote:
Originally Posted by 82gt View Post
I was able to induce a small vacuum leak, but finally replaced the cat and have been groovy ever since
That makes no sense as once the engine warms up and enters closed loop operation, the ECU will richen the mixture to compensate for the vacuum leak and maintain the stoichiometric ratio.

BTW, OP: running injector cleaner is meaningless.
plym49 is offline  
post #20 of 33 Old 03-14-2014, 09:35 AM
jbeebe
Registered User
1991 YJ Wrangler 
 
Join Date: Jul 2008
Posts: 993
I passed my echeck in CLE after running seafoam through the throttle body, then the rest in the gas tank. ran it around for ~50 miles, then took it

91 YJ. 4.0, 4.10's, 33's, 4" springs, 3/4" booms, 1" BL, 1" MML, d30 aussie locker, hand throttle, posi-lock, full cage, bumpers/rocker guards/engine skid, winch.
jbeebe is offline  
post #21 of 33 Old 03-14-2014, 09:56 AM
Tom95YJ
[] Eye'd Jeep Connoisseur
 
Tom95YJ's Avatar
1999 XJ Cherokee 
 
Join Date: Sep 2004
Location: Salt Lake City
Posts: 9,396
Garage
Run a can of seafoam (1/2 in the gas tank, 1/2 through a vacuum hose) change the plugs/wires/ cap/ rotor then go back it'll clean it up it works like a charm on my 89 with carter carb all the time

'89 YJ The Smurf Build Thread
'99 XJ Black Betty Build Thread
Tom95YJ is offline  
post #22 of 33 Old 03-14-2014, 04:53 PM Thread Starter
langwilliams
Registered User
1995 YJ Wrangler 
 
Join Date: Feb 2014
Location: Lorain
Posts: 397
thanks for the tips, going to do plugs an wires, cap this weekend. plugs look ugly an the one I pulled had a .053 gap!
langwilliams is offline  
post #23 of 33 Old 03-15-2014, 12:09 AM
Tom95YJ
[] Eye'd Jeep Connoisseur
 
Tom95YJ's Avatar
1999 XJ Cherokee 
 
Join Date: Sep 2004
Location: Salt Lake City
Posts: 9,396
Garage
Quote:
Originally Posted by langwilliams
thanks for the tips, going to do plugs an wires, cap this weekend. plugs look ugly an the one I pulled had a .053 gap!
.035 is spec unless you have done a Tfi or hei ignition then .045

'89 YJ The Smurf Build Thread
'99 XJ Black Betty Build Thread
Tom95YJ is offline  
post #24 of 33 Old 03-15-2014, 02:38 PM
photontraveler
Old Dude
 
photontraveler's Avatar
1996 XJ Cherokee 
 
Join Date: Aug 2008
Location: Delaware
Posts: 176
Put two cans of dry gas into a full tank of gas.......This has worked for me a number of times..............

"Gun control is like trying to reduce drunk driving by making it tougher for sober people to own cars."
photontraveler is offline  
post #25 of 33 Old 03-15-2014, 05:42 PM
Xpress
Registered User
1996 ZJ 
 
Join Date: Dec 2010
Location: The Great Big Box
Posts: 5,927
Garage
Start with the basics, tune the sucker up. New plugs, cap, rotor, wires, clean your throttle body out, new air filter, change your oil/filter, and make sure it's running at operating temp.

Seafoam will clean out your injectors but not the throttle body, the throttle body is before the injectors. Fit a new fuel filter too.

High octane gas will actually make it run worse, unless it's already in piss poor shape. The higher octane fuel won't burn as efficiently in a low PSI engine like the 4.0 and will probably increase your emissions slightly. Use the lowest octane possible.

If all of that fails, you may be looking at a new cat indeed..

All about that unibody life.
Xpress is offline  
post #26 of 33 Old 03-16-2014, 10:10 PM
czjeeper
Registered User
1992 YJ Wrangler 
 
Join Date: Jul 2006
Location: Woodland
Posts: 1,506
Get the engine to operating temp. and introduce water into the brake booster line. This will vaporize and clean the combustion chamber most any carbon build up. Carbon build up will cause Nox levels to increase. Free and easy. But yeah, you will most likely need a cat at some point.

US Army combat vet
2011 Grand Cherokee Laredo 3.6
Armed Forces Jeeps Member #125
Red Jeep Club Member #251

In the Portland/Vancouver area? Check 'em out! Piston's Wild Motorsports Club

Click here for 2.5L AX5 to AX15 swap
czjeeper is offline  
post #27 of 33 Old 03-18-2014, 11:46 AM Thread Starter
langwilliams
Registered User
1995 YJ Wrangler 
 
Join Date: Feb 2014
Location: Lorain
Posts: 397
if anyone is wondering, i got it to pass. NOx standard is under 1047, i was at 1106. Ran some fuel injector/sea foam thru the tank. changed the plugs an wires. did the sea foam in the intake an let it sit a while. drove it hard an it smoked like a steam engine. went an got 4 gal of shell premium an put a bottle of heet in it. drove it some took it to the check station an it was 841. The tech said that is in standard but still a little high. I fig it'll need a cat for the next test, but who knows!

thanks for the tips
langwilliams is offline  
post #28 of 33 Old 03-18-2014, 10:07 PM
Tom95YJ
[] Eye'd Jeep Connoisseur
 
Tom95YJ's Avatar
1999 XJ Cherokee 
 
Join Date: Sep 2004
Location: Salt Lake City
Posts: 9,396
Garage
Quote:
Originally Posted by langwilliams
if anyone is wondering, i got it to pass. NOx standard is under 1047, i was at 1106. Ran some fuel injector/sea foam thru the tank. changed the plugs an wires. did the sea foam in the intake an let it sit a while. drove it hard an it smoked like a steam engine. went an got 4 gal of shell premium an put a bottle of heet in it. drove it some took it to the check station an it was 841. The tech said that is in standard but still a little high. I fig it'll need a cat for the next test, but who knows! thanks for the tips
The premium fuel and heet probably made it run a little high premium fuel burns slower so it does not run as clean as regular in our old workhorse engines.

'89 YJ The Smurf Build Thread
'99 XJ Black Betty Build Thread
Tom95YJ is offline  
post #29 of 33 Old 03-18-2014, 10:32 PM
Jeep43
Registered User
1995 YJ Wrangler 
 
Join Date: Jan 2009
Location: Hayward
Posts: 109
Here in CA the max nox @ 15mph is 365. I failed at 659. After I changed my cat, plugs, and all filters I passed with a 1. The regulations are getting real strict every few years.
Jeep43 is offline  
post #30 of 33 Old 03-19-2014, 04:29 PM Thread Starter
langwilliams
Registered User
1995 YJ Wrangler 
 
Join Date: Feb 2014
Location: Lorain
Posts: 397
I lived in San Diego for a year while in the navy, I kept my truck registered an insured in Fla! Ohio isn't tightening standards that I know of, in fact on 5 or 7 counties still have to get checked an cars over 25 years old no longer require a check
langwilliams 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









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



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