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Unread 04-27-2008, 08:52 AM   #1
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2002 TJ Wrangler 
Join Date: Jun 2007
Location: upstate ny
Posts: 139
90 wrangler yj idle problem

hey i have a 90 wrangler 4.2 straight 6 and it wont idle everything above 2500 rpms is ok its the low end thats the problem. i have cleaned the idler tubes before and that was the problem thats prob what the problem again but even when i do that it doesnt idle steady it goes up and down. is there anything i can do to get it to idle better

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Unread 04-27-2008, 11:07 AM   #2
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1990 YJ Wrangler 
Join Date: Aug 2006
Location: Grass Valley California
Posts: 14,543
Get familiar with this site.. http://home.sprynet.com/~dale02/list.htm

Do this .. http://jeep.off-road.com/jeep/articl....jsp?id=277064 OR Buy this kit .. http://jeepcarterbbdcarb.com/kit.html

I did the kit and haven't had a problem since. If you can do the Nutter Bypass.
Originally Posted by George Orwell
We sleep safe in our beds because rough men stand ready in the night to visit violence on those who would do us harm.
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Unread 04-28-2008, 03:42 PM   #3
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1988 YJ Wrangler 
Join Date: Dec 2007
Location: South Jersey
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Excellent post
"Courage is not the absence of fear. It is the willingness to move forth despite it's presence"
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Unread 04-28-2008, 04:42 PM   #4
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1990 YJ Wrangler 
Join Date: May 2007
Location: Boston MA
Posts: 1,445
I refer you to Mike Romain's posts regarding how the evap canister purge line can give inconsistent idle:


You can also search the CJ forum on this site for other similar posts.
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Unread 04-29-2008, 06:52 AM   #5
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1990 YJ Wrangler 
Join Date: Jan 2006
Location: VA Beach
Posts: 5,785
I fought with mine and could never keep the idle clean for more then a week. I replaced the stocker with an MC2100 and I havn't messed with the thing since I put it in. My milage went up too.
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