4.2 rough idle and stalling problem - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 04-10-2008, 04:19 PM   #1
Newb
 
Join Date: Apr 2008
Posts: 5
4.2 rough idle and stalling problem

i have a 1990 yj 4.2 with a weber carb which had always had a hard time starting and every once in awhile it would stall when down shifting. it idle rough when its cold out (barley running) but once warmed up its fine. the other day i took it out mudding and must have sucked up something because when i would let out the clutch and push on the gas it would stall as a started to move. i rev'd it up and it backfired a few times and the stalling right after i let off the clutch went away( at the time i just wanted to get it home) but now it will start but when i shift the rpms drop and it stalls it also stalls when i stop. so it only idle when its first start and i have to help it out by giving it some gas until it takes and idles but it is barley idling. it also still starts hard in the cold. Any ideas of what it is?
{note it doesnt have a cat could water been sucked up the pulse are tube? i have heard this to be common. i though some dry gas and in tank gas cleaner but no change yet.}
any help would be greatly appreciated
thanks, Ethan

truemainer150 is offline   Quote Quick Reply
Old 04-10-2008, 04:25 PM   #2
Jeeper
 
jpdocdave's Avatar
 
Join Date: Mar 2008
Location: beach park, il
Posts: 8,162
Images: 7
thats no fun, fuel injection is nice.

__________________
"The danger to America is not Barack Obama but a citizenry capable of entrusting a man like him with the Presidency. It will be far easier to limit and undo the follies of an Obama presidency than to restore the necessary common sense and good judgment to a depraved electorate willing to have such a man for their president."
http://mybroadband.co.za/photos/data...re_cowbell.gif
jpdocdave is offline   Quote Quick Reply
Old 04-10-2008, 04:51 PM   #3
Newb
 
Join Date: Apr 2008
Posts: 5
yeah its not so fun and fuel injection is very nice...any ideas of what it could be?
truemainer150 is offline   Quote Quick Reply
Old 04-10-2008, 08:57 PM   #4
Jeeper
 
The Sos's Avatar
 
Join Date: Aug 2007
Posts: 115
Mine does roughly the same thing as far as starting (I also have a 4.2 with a Webber carb). Everyone seems to want an arm and a leg to adjust the Carb or rebuild it so I thing I am going to save for the fuel injection kit. Its more in the long run but I have read that its well worth it. Hope you didn't suck something in your engine.
__________________
My Jeep is like a bum, always begging for change
The Sos is offline   Quote Quick Reply
Old 04-11-2008, 02:03 PM   #5
Newb
 
Join Date: Apr 2008
Posts: 5
bump
truemainer150 is offline   Quote Quick Reply
Old 04-11-2008, 05:20 PM   #6
Jeeper
 
Join Date: Mar 2008
Posts: 17
Closest I had to this problem was when I sucked a piece of hay chaff into the carb and it blocked one of the jets - engine would run fine at idle, and seemed okay at high rev, but right in the power band it would sputter and spurt... Took the carb apart, found the chaff, put it back together and it ran like a charm.
ctclark1 is offline   Quote Quick Reply
Old 04-11-2008, 07:47 PM   #7
Newb
 
Join Date: Apr 2008
Posts: 5
could a fouled plug do this or water in the distributer? could i maybe have fouled a plug wheeling? it sat all for most of a winter but that was two winters ago. let me know if i can provide you whit some more info.
truemainer150 is offline   Quote Quick Reply
Old 04-11-2008, 10:01 PM   #8
Jeeper
 
Join Date: Mar 2008
Posts: 17
choke adjustment? broken choke spring? Idler adjustment? I'm not the best trained engine guy in the world but it probably could be any of those, too.
ctclark1 is offline   Quote Quick Reply
Old 04-12-2008, 07:38 AM   #9
Newb
 
Join Date: Apr 2008
Posts: 5
we took the electronic choke out thinking that was the problem and installed a hand choke....where about is the idle adjust spring on a webber carb for a 4.2? should i try to mess with the idle? i know how to adjust it and make it right i just dont know where the idle adjust screw is. thanks.
truemainer150 is offline   Quote Quick Reply
Old 04-12-2008, 05:10 PM   #10
Jeeper
 
Join Date: Mar 2008
Posts: 17
Not sure on a Webber carb - Mine was replaced with a Motorcraft/Holley carb when I bought my 87.
(And, ooo, a fancy electric choke... I mentioned the choke thinking you had a bimetallic spring choke)

ctclark1 is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

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.



Thread Tools

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 Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
4.0l stalling idleing low 98trailbeast TJ Tech Forum 7 01-07-2009 08:35 PM
Semi Stalling in 98 Wrangler RichieCropper CJ General Discussion Forum 2 10-09-2008 06:59 PM
Semi Stalling in 98 Wrangler RichieCropper TJ General Discussion Forum 1 09-29-2008 10:36 AM
87 jeep YJ stalling at low RPMs aquaman YJ Tech Forum 9 12-03-2007 07:00 PM
Idle fluctuation dcrolin TJ Tech Forum 2 03-31-2006 12:22 AM



» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 09:12 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC