Need help passing smog with my 1990 jeep w/ carb - JeepForum.com
Reply
 
LinkBack Thread Tools
post #1 of 16 Old 05-14-2012, 11:29 PM Thread Starter
BobbyJoe619
Registered User
 
Join Date: May 2012
Location: San Diego
Posts: 7
Need help passing smog with my 1990 jeep w/ carb

I own a 1990 jeep wrangler 4.2 L. 6 cyl. Manual w/ carburetor and it won't pass smog. It is registered in San Diego California, had no problems passing in 2011 and everything has been kept stock. I failed evap test, gas cap failed, and failed emissions because NOX is too high at 15. mph. ( max. is 714 my MEAS is 960). My CO% read MEAS 0.00 (max 0.52 ave. 0.10) At 25 mph everything is fine and has a pass. Any suggestions?! Please help!

BobbyJoe619 is offline  
Sponsored Links
Advertisement
 
post #2 of 16 Old 05-14-2012, 11:43 PM
jbolty
Moderator
 
jbolty's Avatar
1990 YJ Wrangler 
 
Join Date: Jun 2007
Location: San Diego
Posts: 17,775
Garage
high nox is generally caused by a bad cat, bad EGR or a too lean condition with overly high combustion temps.

The 4.2 is notorious for vacuum leaks so start with that.

Take off the egr, clean it and make sure it's moving freely.

See if the fuel vent system is all solid and pay attention to the rollover valve up inside the right rear fender.

Go here for a hose diagram and other info.

http://home.sprynet.com/~dale02/list.htm

.
"The right to be heard does not necessarily include the right to be taken seriously." —Hubert Humphrey
.
If you live within wheeling distance of San Diego county, click here
jbolty is offline  
post #3 of 16 Old 05-15-2012, 12:00 AM
Delta347
Registered User
1990 YJ Wrangler 
 
Join Date: Mar 2008
Location: Anaheim
Posts: 1,589
Quote:
Originally Posted by BobbyJoe619 View Post
I own a 1990 jeep wrangler 4.2 L. 6 cyl. Manual w/ carburetor and it won't pass smog. It is registered in San Diego California, had no problems passing in 2011 and everything has been kept stock. I failed evap test, gas cap failed, and failed emissions because NOX is too high at 15. mph. ( max. is 714 my MEAS is 960). My CO% read MEAS 0.00 (max 0.52 ave. 0.10) At 25 mph everything is fine and has a pass. Any suggestions?! Please help!
Had that issue on my 90' Auto 4.2.....I paid like 800$ for repairs and checks...then had it smogged and it went from 1148ppm to 2600ppm.....

I tried cleaning the EGR which made it worse, I tried checking the vacuum tubes but just kept finding more and more that were dsiconnected that I couldnt figure out where they were supposed to go.

Check your Catalytic's 'return' pipes it turned out both of mine were completley rotted through and not even doing anything..and check the Cat mine got water in it through the rotted holes in those 'return' pipes (the narrow ones that go back to the manifold and air box) and ate the entire inside out....

Quote:
Originally Posted by Leans93 View Post
So ghost has a plug in his hole and opihi has a gaping hole, Do I need to worry about this hole at all? I just don't want to start her up and have something spewing out of it.
Side Effects may include dry mouth, nausea, vomitting, water retention, painful recolage, hallucination, dementia, psycosis, coma, death, and halitosus. YJs are not for everyone please consult your physician before use.
Delta347 is offline  
post #4 of 16 Old 05-15-2012, 02:04 AM Thread Starter
BobbyJoe619
Registered User
 
Join Date: May 2012
Location: San Diego
Posts: 7
Thank you guys for the suggestions, they are very helpful. Now I know what to do with my Jeep first thing in the morning. It doesn't surprise me at all that the guys at Harloff ( Gold Shield certified smog repair shop) didn't have any other suggestions besides throwing out the carb and installing a Howell fuel injection kit! They made it seem like no one will work on carburators anymore.
BobbyJoe619 is offline  
post #5 of 16 Old 05-15-2012, 07:30 AM
jbolty
Moderator
 
jbolty's Avatar
1990 YJ Wrangler 
 
Join Date: Jun 2007
Location: San Diego
Posts: 17,775
Garage
If you have the money for a howell kit do it immediately.

.
"The right to be heard does not necessarily include the right to be taken seriously." —Hubert Humphrey
.
If you live within wheeling distance of San Diego county, click here
jbolty is offline  
post #6 of 16 Old 05-15-2012, 10:49 AM Thread Starter
BobbyJoe619
Registered User
 
Join Date: May 2012
Location: San Diego
Posts: 7
Ok is there a good place where I can buy a used Howell kit that is in excellent condition? If I get a brand new one and have Harloff install it with 10 man hours it will cost me around $2,200!
BobbyJoe619 is offline  
post #7 of 16 Old 05-15-2012, 10:56 AM
jbolty
Moderator
 
jbolty's Avatar
1990 YJ Wrangler 
 
Join Date: Jun 2007
Location: San Diego
Posts: 17,775
Garage
Kits pop up on craigslist once in a great while and sometimes on ebay. Personally I would get it direct from Howell for the warranty and support and do it yourself. Best mod I ever did.

The other alternative is to swap in a 4.0 with fuel injection.

Sounds like you can get the smog passed if it's only high nox.

.
"The right to be heard does not necessarily include the right to be taken seriously." —Hubert Humphrey
.
If you live within wheeling distance of San Diego county, click here
jbolty is offline  
post #8 of 16 Old 05-15-2012, 12:06 PM
Xpress
Registered User
1996 ZJ 
 
Join Date: Dec 2010
Location: The Great Big Box
Posts: 5,926
Garage
Get the Howell kit and put it in yourself. You have to learn how to work on your own Jeep, because these are high maintenance toys. None of that maintenance free stuff, and that's what makes them such a fun hobby

All about that unibody life.
Xpress is offline  
post #9 of 16 Old 05-15-2012, 01:15 PM Thread Starter
BobbyJoe619
Registered User
 
Join Date: May 2012
Location: San Diego
Posts: 7
cool. I am going to run the Jeep through the diagnostic phase first at Harloff tomorrow to check everything before ordering the FI just in case.
BobbyJoe619 is offline  
post #10 of 16 Old 05-15-2012, 01:29 PM
jbolty
Moderator
 
jbolty's Avatar
1990 YJ Wrangler 
 
Join Date: Jun 2007
Location: San Diego
Posts: 17,775
Garage
Before you do anything or spend any money on an FI kit make sure the engine is otherwise in good order. Good compression, no excessive oil use, no cooling problems, etc.

.
"The right to be heard does not necessarily include the right to be taken seriously." —Hubert Humphrey
.
If you live within wheeling distance of San Diego county, click here
jbolty is offline  
post #11 of 16 Old 05-15-2012, 01:30 PM Thread Starter
BobbyJoe619
Registered User
 
Join Date: May 2012
Location: San Diego
Posts: 7
Also I will admit that I am a rook and it will be a bad mistake if I try to do this myself
BobbyJoe619 is offline  
post #12 of 16 Old 05-15-2012, 01:32 PM Thread Starter
BobbyJoe619
Registered User
 
Join Date: May 2012
Location: San Diego
Posts: 7
Thanks jbolty just what I had in mind!
BobbyJoe619 is offline  
post #13 of 16 Old 05-15-2012, 10:53 PM
StvDiego
Registered User
 
Join Date: Jul 2007
Location: The Group W Bench
Posts: 3,889
Quote:
Originally Posted by BobbyJoe619 View Post
Ok is there a good place where I can buy a used Howell kit that is in excellent condition? If I get a brand new one and have Harloff install it with 10 man hours it will cost me around $2,200!
A problem with buying a used Howell is that getting support for CARB issues from Howell (and getting a CARB sticker) becomes much more difficult.

i wouldn't worry about the install as a DIY, if Jeff (jbolty) can do it anyone can
StvDiego is offline  
post #14 of 16 Old 05-15-2012, 10:59 PM
jbolty
Moderator
 
jbolty's Avatar
1990 YJ Wrangler 
 
Join Date: Jun 2007
Location: San Diego
Posts: 17,775
Garage
nothing to it


.
"The right to be heard does not necessarily include the right to be taken seriously." —Hubert Humphrey
.
If you live within wheeling distance of San Diego county, click here
jbolty is offline  
post #15 of 16 Old 05-15-2012, 11:57 PM
StvDiego
Registered User
 
Join Date: Jul 2007
Location: The Group W Bench
Posts: 3,889
cut the green wire

or is it the blue??
StvDiego 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



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
1990 YJ regear Arkie90YJ SanDiego 1 01-24-2011 05:27 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