Were to look for vacuum leak? - JeepForum.com
LinkBack Thread Tools
post #1 of 3 Old 10-03-2013, 07:48 AM Thread Starter
Registered User
2000 WJ 
Join Date: Oct 2011
Location: Boulder
Posts: 1,208
So I suspect that I have a vacuum leak on my 2000 4.7 and I plan on getting some propane to help find it. I have what I think are the common symptoms, ( power loss, and rough idling at times) and I can here hissing at times while driving and idling. the problem is I can't hear or find it when i pop the hood, can any one point me in a direction.

Sent from my Galaxy S4 using JeepForum

Jrboarder27 is offline  
Sponsored Links
post #2 of 3 Old 10-03-2013, 08:38 AM
Registered User
2001 WJ 
Join Date: May 2013
Location: Denver
Posts: 599
You could start by checking all of the vacuum lines coming out of the intake manifold and follow the vacuum hoses outward. I would bet that some of the hoses are dry and cracked, especially where thay mate up with a fitting or a T. On my 2001 I found several that were dry rotted and cracked on the end where they mounted on the fittings on the intake manifold.

2001 GC Laredo 4.0 4x4 - Black l 2001 GC Laredo 4.0 4x4 - Silver
grussell is offline  
post #3 of 3 Old 10-03-2013, 02:59 PM
Registered User
2003 WJ 
Join Date: Jun 2009
Location: Colorado
Posts: 151
x2 on checking all the rubber vacuum lines coming out of the intake. There are several places that will be cracked, go to NAPA or whoever and the the 1/4 hose and replace all of them.

2003 Grand Cherokee Limited - Mostly Stock
swkenobi is offline  

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

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