Smog disabled 1990 YJ -
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 > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > Smog disabled 1990 YJ

FS: Jeep Fog Light LED Bulbs! Several Brightness Options! *STOP UNWANTED LIGHT BAR NOISE* with Pandemic LED Light BaRuffstuff 10 year sale

Unread 02-25-2009, 05:20 PM   #1
Registered User
1990 YJ Wrangler 
Join Date: Feb 2009
Location: Nashville, TN
Posts: 42
Smog disabled 1990 YJ

Hey all,
So far I'm enjoying my membership here. Lots of useful info, thanks! Can anyone tell me if a '90 YJ is computer controller or not? This one I bought has had most of it's smog related gear pulled out or disabled, and I'm not sure where to start. I'm considering a new carb/intake manifold/header combination. There are no smog regs where I live. Anyone have any suggestions?

AidanMullen is offline   Reply With Quote Quick reply to this message
Unread 02-25-2009, 05:34 PM   #2
Registered User
1989 YJ Wrangler 
Join Date: Oct 2006
Location: Vernon, NJ
Posts: 4,757
Take a picture of the carb and engine and post a link. All the 4.2's had a computer controlled emission system. Read all about the workings here..LINK. It can run very nicely with most of the stuff removed.. Search Nutter Bypass....
89' YJ Larado 4.0L,AX15
05' Grand Cherokee Limited, 2"OME lift and a Hemi.
Burnerman is offline   Reply With Quote Quick reply to this message
Unread 02-25-2009, 05:35 PM   #3
Registered User
2008 JK Wrangler 
Join Date: Mar 2007
Location: Arizona
Posts: 1,127
As long as you are positive that you have no emissions restrictions you can rip it all off. This is a very popular topic here on YJ - JF. But if you ever move or sell it in another state you may find that you can't get it registered an almost everything has to be put back on.

Do a search for "Emissions YJ? you will find dozens of threads.

As far as computer controlled... yes you have it on a 1990 but you can all but eliminate it by doing the "Nutter bypass" If you have a stock Carter Carb there are a few extra steps related to modding the carb, any other aftermarket Carb and the Nutter is a must do.

The biggest pitfall to removing all the stuff is vacuum leaks. Pay close attention to the details.
One does not establish a dictatorship in order to safeguard a revolution; one makes a revolution in order to establish a dictatorship. - Orwell
No_Return is offline   Reply With Quote Quick reply to this message

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


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.

Thread Tools

Suggested Threads

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