idles high and overheated - 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
Old 07-19-2013, 04:47 PM   #1
Join Date: Oct 2011
Posts: 36
idles high and overheated

'06 X, 4.0L Inline 6, auto trans

Here's the problem:

Recently replaced cooling system - radiator, water pump, thermostat, cap.
I have noticed the last few days it was still running a bit higher than the 210 reading but I haven't seen any fluid drops or leaks anywhere.

Today it went into the red, turned on heat to draw away from motor, not much effect. Not wanting to be stranded with my wife and daughters I continued driving home.

As we were driving I noticed if I released the gas pedal the jeep kept traveling at the same speed, when braking it wanted to keep driving. When I put it in neutral the rpm gauge was near 2800.

As I continued to drive it started making a knocking noise, the power was down, unless I dropped into 2nd there was no acceleration, or at most very little.

When I pulled in the driveway she quit.

After the smoke/steam cleared I noticed two threaded rods at what I presume to be the intake manifold. There was no nut on either. It looks to be a heat shield covering the part.

I did notice smoke/steam coming out from around the manifold.

Any ideas?

I tried cycling the key to read the code on the odometer but all I got was "done"

Help would be greatly appreciated to try diagnosing this issue.

Jkubat is offline   Quote
Old 07-19-2013, 08:45 PM   #2
Join Date: Oct 2011
Posts: 36
Discovered the thermostat went bad. I put it in boiling water, no movement at all. Left it out, ran the jeep for a bit, no problems. Will replace tomorrow.

Jkubat is offline   Quote
Old 07-26-2013, 10:24 AM   #3
pi55edoff's Avatar
Join Date: Jul 2012
Location: Circle Pines
Posts: 180
That would've been my first guess as well since the heater being on didn't help it.
pi55edoff is offline   Quote
Old 07-26-2013, 11:43 AM   #4
Supporting Member

WF Supporting Member
western196611's Avatar
Join Date: Jun 2013
Location: Central Kansas
Posts: 724
They do have them now (thermostats) when they go bad they will stick open....
1995, 4.0, 5 speed YJ, SOA, TC drop, 8.8 swap with 4.10 and LSD, e-grills bumper, 33" BF all terrains on 15" wheels.
western196611 is offline   Quote
Old 07-26-2013, 08:14 PM   #5
Rubicondon53's Avatar
Join Date: Feb 2011
Location: pennsylvania
Posts: 1,590
Originally Posted by western196611 View Post
They do have them now (thermostats) when they go bad they will stick open....
Checked with my mechanic buddy just today, no such thermostat exists that is guaranteed to stick open... They say they do, but the manufacturers will not warrant them..
04' Rubi, with all the gizmos we need for long range excursions, / home modified excursion trailer;

96' Lexus 450, locked, loaded and ready to roll..
'12 VW New Beetle
Rubicondon53 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

Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 03:37 PM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC. is not in any way associated with the Chrysler Motors LLC