2.5l Vacuum Plug on Throttle Body? Leak? - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 01-10-2010, 09:45 AM   #1
Join Date: Jan 2010
Posts: 191
KCrisp is on a distinguished road
2.5l Vacuum Plug on Throttle Body? Leak?

I just bought my first wrangler, 1999 with the 2.5l engine and a stick. I have a question about an issue and would appreciate any help.

The jeep has 112K on it, so I replaced the water pump and the thermostat since the pump was just starting to leak. I got everything back together and started it and heard a very loud, very large vacuum leak. The source of this is the throttle body (something I didn't touch or get near) and there is a port on the side that has a 90 degree rubber tube on it that looks like a spark plug boot. The bottom of the tube is wide open to the atmosphere and it sucks in a huge amount of vacuum. There are at least three such ports there, this is the upper one. I assumed I had knocked off a vacuum hose that was supposed to go into this boot but I sure can't see one anywhere. If I plug this port the jeep runs fine. There are no codes either.

Was this a factory plug for an unused vacuum port? (For an automatic transmission, maybe?) And maybe the right angle rubber boot used to have a plug in it and that fell out?

I did notice a couple days before I did this work that the idle suddenly went to 3000 rpm and stayed there on a cold start. I shut it off and it was fine after that.

Many thanks in advance.
KCrisp is offline   Quote

Thread Tools

Posting Rules
You may not post new threads
You may not 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
Throttle Body Issue??? bnajeep General Jeep Discussion 1 08-24-2009 12:56 PM
Question about 4.0 Throttle body for 2.5 Gdkerplunk03 YJ Tech Forum 4 05-16-2009 12:58 PM
Vacuum leak??? Broncodriver TJ General Discussion Forum 20 04-19-2009 10:23 PM
Tommy Was A Wise Man!!! Dare2BSquare Off-Topic 26 03-11-2009 10:33 AM
vacuum leak whitebuffalo General Jeep Discussion 33 06-22-2005 05:28 PM

Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 08:23 AM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.

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
« Back

Enter your email address:

Delivered by FeedBurner