High idle after after intake/exhaust gasket replacement. - 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 06-08-2014, 05:24 PM   #1
Jeeper
 
Hawaii5O's Avatar
 
Join Date: Dec 2013
Location: Schofield Barracks, HI
Posts: 212
High idle after after intake/exhaust gasket replacement.

Just as the title reads. I have a 91 4.0 and it had a high idle. I used the carb cleaner trick to locate a leak at the intake/exhaust manifold gasket. So after several hours of cursing along with some blood, sweat and almost tears, the new gasket was on. Pretty ridiculous that I had to take off the power steering pump and bracket to get the intake and exhaust manifold off. Anyway, I put it all back together and checked everything and now the Jeep idles at 1500 rpm. Suggestions? I tried to make sure there wasn't a vacuum leak and didn't find anything. I did find that the exhaust manifold has a crack in it where the tubes come together. I'm at a loss. Is there a way to adjust the throttle? Also, it smells like it's running a little rich. Any help would be greatly appreciated.

__________________
I am a man of simple tastes easily satisfied with the best” ― Winston Churchill
Hawaii5O is offline   Quote Quick Reply
Old 06-08-2014, 05:26 PM   #2
Jeeper
 
Hawaii5O's Avatar
 
Join Date: Dec 2013
Location: Schofield Barracks, HI
Posts: 212
Click image for larger version

Name:	ForumRunner_20140608_122623.jpg
Views:	27
Size:	100.8 KB
ID:	1185594

__________________
I am a man of simple tastes easily satisfied with the best” ― Winston Churchill
Hawaii5O is offline   Quote Quick Reply
Old 06-09-2014, 06:21 AM   #3
Jeeper
 
Jkilbert's Avatar
 
Join Date: Aug 2013
Location: McKeesport,Pa
Posts: 203
Send a message via Yahoo to Jkilbert
Still sounds like a vacuum leak. Double check everything especially your vacuum lines and the plastic fittings. It all gets brittle and can crack.
__________________
1992 Wrangler 2.5l 5spd.
Yes it's a money pit, but it's my money pit.
Jkilbert is offline   Quote Quick Reply
Old 06-09-2014, 07:11 AM   #4
Jeeper
 
StanF's Avatar
 
Join Date: Jan 2013
Location: Austin, TX
Posts: 865
A tip that might help - when I did this debugging before, I used little rubber caps from the auto parts store to block off every vacuum line to the intake except for the MAP. Buy an assortment pack, and you'll find a size to fit every fitting. Don't forget to check around the throttle body gasket for your leak.
__________________
1995 YJ, 4.0L, AX15, 3" susp lift; Lock Right in Dana 30; 8.8 LSD; Flat Tummy Tuck, 1" Daystar BL; 1" MORE MML; 35" MT/r Tires;

StanF Tummy Tuck, Ford 8.8, Gas Tank Lift, Rocker Guard Fab, Ammo Can Console
StanF 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




» Featured Product

All times are GMT -5. The time now is 12:40 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