6 cyl 90 wrangler idle problems - JeepForum.com
LinkBack Thread Tools
post #1 of 4 Old 04-24-2010, 02:28 PM Thread Starter
Registered User
Join Date: Apr 2010
Location: 06340
Posts: 4
6 cyl 90 wrangler idle problems

I picked up this 90 4.2 wrangler, and the carb is after market. This is what it looks like.

I think it is one of these two, I am not sure though.

Carburetors by Weber for Jeep Wrangler YJ

I am having problems with the idle. It seems to stall out at low RPMs. The jeep runs great at higher RPMs, just not so well at idle. It also sometimes dies after the engine starts up, but then starts up right away.

Any ideas would be helpful. I was thinking maybe the nutter fix, but my understanding is that is for the OE carb. I also saw this guys fix. But I don't know

Easy Fix for Jeep 258 Carter BBD Idle Problem - - Jeep at Off-Road.com

chadless is offline  
Sponsored Links
post #2 of 4 Old 04-24-2010, 05:26 PM
Registered User
1990 YJ Wrangler 
Join Date: May 2007
Location: Boston MA
Posts: 1,447
Well the carb may need to be tuned up/cleaned/rebuilt. there are many threads on the forums about tuning webers.

that being said, if the Nutter has not been done then you will need to do it even though you have a weber carb. that is because the computer is still controlling the timing and god knows what it is doing to it. Read up on the Nutter and get that done so that you have good timing and then you can go from there. also look into the "team rush" ignition upgrade on this forum and the CJ forum. early 80's CJ had virtuallt the same engine and you can get good tips from the CJ forum.
also research what old emissions components you can remove, right away I see the solenoids on the valve cover and the switches right behind there on the firewall can be the first to go .

read this site, you can learn what everything is to figure out what can go or stay:
ctm is offline  
post #3 of 4 Old 04-25-2010, 09:31 AM Thread Starter
Registered User
Join Date: Apr 2010
Location: 06340
Posts: 4
thank you for the input. I figured out that the carb is actually a EMPI 32/36 X, not a weber. The thing is I have looked at the nutter, but I can't figure out whether its been done yet or not. I will look into getting rid of the vestigial equipment.
chadless is offline  
post #4 of 4 Old 04-25-2010, 12:56 PM
Registered User
1983 CJ7 
Join Date: May 2009
Location: Texas Hill Country
Posts: 6,705
You may want to give your EGR a quick once-over and make sure it isn't open during idle. If you reach around behind it, you can feel the plunger. Make sure it moves freely and stays in the closed position at idle.

Just a thought, hope it helps!


holley carb tuning

Live in a way that those who know you but don't know God will come to know God because they know you.
swatson454 is online now  

Quick Reply

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:
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.

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
idle problems KeyserGogo TJ Wrangler Technical Forum 9 09-30-2008 07:24 PM
Idle problems. RPM's low at idle. rocknjeep YJ Wrangler Technical Forum 6 08-16-2008 07:54 PM
Idle problems black93delsolsi YJ Wrangler Technical Forum 3 09-04-2003 04:24 AM
Idle and low RPM problems jeeperstl YJ Wrangler Technical Forum 11 06-15-2003 08:55 PM
Idle problems Big Blue Jeep YJ Wrangler Technical Forum 12 05-31-2003 12:25 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