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Unread 02-25-2009, 04:20 PM   #1
AidanMullen
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1990 YJ Wrangler 
 
Join Date: Feb 2009
Location: Nashville, TN
Posts: 41
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?

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Unread 02-25-2009, 04:34 PM   #2
Burnerman
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1989 YJ Wrangler 
 
Join Date: Oct 2006
Location: Vernon, NJ
Posts: 4,756
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....
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Unread 02-25-2009, 04:35 PM   #3
No_Return
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2008 JK Wrangler 
 
Join Date: Mar 2007
Location: Arizona
Posts: 1,118
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.
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