Idle/Cut out - A/C causes stalling or rise in idle speed - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 10-01-2009, 12:35 PM   #1
Jeeper
 
britcay's Avatar
 
Join Date: Sep 2009
Location: Grand Cayman, Cayman Islands
Posts: 26
Idle/Cut out - A/C causes stalling or rise in idle speed

I have an idling issue....

Periodically I get a stall at idle, or even downshifting esp without the a/c on. Seems worse once the Jeep is warmed up.

I noticed if I turned on the a/c then the idle speed increases a couple of hundred or so, not huge. Sometimes it'll drop down (dont think it's sticking as I've tried blipping the throttle nothing happens) then up... then down.... no discernable pattern.

So I started to check for vaccum leaks and noticed at first one tube just hanging at the rear of the carb - I traced this to the front of the air intake (before filter, manual says "reverse delay valve" what is that, some kind of warm air valve??).

Second and with the engine almost dying, I noticed another tube exiting the rear of the carb, going into a small diaphragm with a moving needle behind. When I removed this, the needle sat back, the engine idle jumped back to normal and the carb sucked in air thru this, but all seemed to work fine.

What (aside from unfiltered air in the carb) am I damaging by running like this? The engine has been idling and running perfectly since.

I'm thinking of doing the nutter bypass as I suspect some shenannigans with the computer etc, but any ideas welcomed on that vaccum pipe?

britcay is offline   Quote Quick Reply
Old 10-01-2009, 03:46 PM   #2
Jeeper
 
Join Date: Nov 2008
Location: Louisiana
Posts: 29
I think you should be fine. can you get pics of the line in question?

__________________
1992 YJ 6 1/2" Lift SOA , Rear Dana 44 with Detroit Electrac out of 1987 XJ, 1995 XJ Dana 30 with ARB and 4:56 gears,JB4x4 High Steer, 33" super swampers. 1995 XJ 4.0, Ax-15 trans, Dana 300 Twin stick flipped w/ northwestfab cable shifters.
bigredcherokee is offline   Quote Quick Reply
Old 10-03-2009, 12:33 PM   #3
Jeeper
 
britcay's Avatar
 
Join Date: Sep 2009
Location: Grand Cayman, Cayman Islands
Posts: 26
Ok Red, here it is.... my hand is getting in the way a bit, but I'm holding the tube away from the back of the carb - the valve with the moving needle can just be seen above this



any ideas welcomed
britcay 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:
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
4.2 carb problems stray YJ Tech Forum 20 09-29-2014 11:02 PM
Engine idle question. nagymjr TJ Tech Forum 9 05-16-2009 12:30 AM
Speed Pulse Sensor?????? no_limits_jeep TJ Tech Forum 3 02-08-2009 09:54 PM
4.2 rough idle and stalling problem truemainer150 YJ Tech Forum 9 04-12-2008 06:10 PM
Very Sad I bought a Lemon... Jahaira_JeepYJ89_fan YJ General Discussion Forum 19 07-13-2007 04:01 PM



Download our Mobile App

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 08:53 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