How to check for vacuum leak and Idle air control valve - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > How to check for vacuum leak and Idle air control valve

SPARTAN LOCKERS are on sale BIG TIME at ROCKRIDGE 4WD!NEW JK WRANGLER GRAB BARS NOW at ROCKRIDGE4WDRough Country Jeep Suspension Deals at Rockridge 4WD!

Reply
Unread 01-05-2015, 05:12 AM   #1
Rangor
Registered User
1992 YJ Wrangler 
 
Join Date: Apr 2014
Location: Salt Lake City, Utah
Posts: 4
How to check for vacuum leak and Idle air control valve

So my jeep has a very rough idle at start, where it will surge and then drop low to the point of the engine dying. Then when starting to drive, the engine will jerk and stutter. I've read on here that it could be a vacuum leak, fuel pump, or idle air control valve. My problem is A) I don't know how to test for vacuum leaks B) I don't know where the IAC is. Any help would be appreciated.

Rangor is offline   Reply With Quote Quick reply to this message
Unread 01-05-2015, 05:34 AM   #2
Chrisnvegas
Web Wheeler
 
Chrisnvegas's Avatar
1992 YJ Wrangler 
 
Join Date: Dec 2012
Location: The Desert, Nv
Posts: 1,892
I use an unlit propane torch around vacuum connections at idle. Follow the vac hoses for cracks or splits that are tough to see. Run it around the air intakes. (Throttle body and intake manifold)
If there's a leak, the idle will smooth out or raise up. Don't forget about the CAD vac lines.

People use carb cleaner the same way. I don't because it's flammable. If you use carb cleaner, have a fire extinguisher handy. carb cleaner works well and it's normally safe.
__________________
What happens in my Jeep, stays in my Jeep
Chrisnvegas is online now   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

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:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
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






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.