New motor runs hot idling.,., - WranglerTalk -Jeep Wrangler Forum
WranglerTalk -Jeep Wrangler Forum
xjtalksho.com
  


Go Back   WranglerTalk -Jeep Wrangler Forum > TJ - Jeep Wrangler (1997-2006) > OEM/Factory (TJ)

Notices

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 07-14-2009
SUNDANCE's Avatar
SUNDANCE SUNDANCE is offline
Newbie
SUNDANCE's Profile Fields
 
Join Date: Jul 2009
Location: GRAND BAY, ALA.
Posts: 26
Thanks: 0
Thanked 6 Times in 6 Posts
Groans: 0
Groaned at 0 Times in 0 Posts
Chats: 0
SUNDANCE is on a distinguished road
Points: 324, Level: 1
Points: 324, Level: 1 Points: 324, Level: 1 Points: 324, Level: 1
Activity: 99%
Activity: 99% Activity: 99% Activity: 99%
Default New motor runs hot idling.,.,

O.k. S0me of you may already know about my problem with my 2000 tj 4.0l running hot.,.,.for those who havn't heard about it .,.here goes.,.,,i had a new crate motor, long block installed at a reputable shop,..,along with the new motor, new oil pump, new water pump, new thermastsat(195), six new fuel injecters, new fuel pump, new radiator, new rad. Cap,(16lb) and the catalytic converter is not stopped up. Compression leak down test has been done and no leaks from compression to cooling system. We even pulled the timing cover off and made sure the timing at the gears was o.k. There is not any water, gas, oil leaks any where..,.,.now hears the problem..,i use this jeep as a escort/ flag car for 18 wheelers, with oversize loads, 99% highway driving,.,.,running at speeds up to 65 mph temp. Runs 195-200,.,., running speeds 70 +, it runs 215-220,..,when i run at speeds 70+ and pull over in a parking lot, truck scales ect. It runs hot after idling 5 min's..,.,idle it up to 15/1800 rpms or drive off, it cools down within a min. And the temp. Drops to 215/220. When it sets and idles after drive below 65 mph it will set a idle for 20 min's. Before running hot.,.,no one knows why it does this..,someone said that all jeeps do this.,.,.,but the old motor would set and idle all day and never run hot. I have 7000 miles on the new motor.,.,.,anyone know whats going on with this.??..,o.,.,.and all lugnuts are tight.,.lol
Reply With Quote
  #2  
Old 07-14-2009
muddeprived's Avatar
muddeprived muddeprived is offline
Chatty
muddeprived's Profile Fields
 
Join Date: Jul 2009
Location: beaver Falls, PA
Posts: 242
Thanks: 1
Thanked 40 Times in 38 Posts
Groans: 0
Groaned at 0 Times in 0 Posts
Chats: 1
muddeprived is on a distinguished road
Points: 3,152, Level: 1
Points: 3,152, Level: 1 Points: 3,152, Level: 1 Points: 3,152, Level: 1
Activity: 20%
Activity: 20% Activity: 20% Activity: 20%
Default

Quote:
Originally Posted by SUNDANCE View Post
O.k. S0me of you may already know about my problem with my 2000 tj 4.0l running hot.,.,.for those who havn't heard about it .,.here goes.,.,,i had a new crate motor, long block installed at a reputable shop,..,along with the new motor, new oil pump, new water pump, new thermastsat(195), six new fuel injecters, new fuel pump, new radiator, new rad. Cap,(16lb) and the catalytic converter is not stopped up. Compression leak down test has been done and no leaks from compression to cooling system. We even pulled the timing cover off and made sure the timing at the gears was o.k. There is not any water, gas, oil leaks any where..,.,.now hears the problem..,i use this jeep as a escort/ flag car for 18 wheelers, with oversize loads, 99% highway driving,.,.,running at speeds up to 65 mph temp. Runs 195-200,.,., running speeds 70 +, it runs 215-220,..,when i run at speeds 70+ and pull over in a parking lot, truck scales ect. It runs hot after idling 5 min's..,.,idle it up to 15/1800 rpms or drive off, it cools down within a min. And the temp. Drops to 215/220. When it sets and idles after drive below 65 mph it will set a idle for 20 min's. Before running hot.,.,no one knows why it does this..,someone said that all jeeps do this.,.,.,but the old motor would set and idle all day and never run hot. I have 7000 miles on the new motor.,.,.,anyone know whats going on with this.??..,o.,.,.and all lugnuts are tight.,.lol
Our man Mudderoy is going through something like this on his 4.0 xj. Let's wait till he chimes in cuz he's done quite a bit of research on this.

Are your fans working? On solution would be electric fans so you can turn them on and off when needed.
Reply With Quote
  #3  
Old 07-14-2009
Mudderoy's Avatar
Mudderoy Mudderoy is offline
Just some guy
Mudderoy's Profile Fields
 
Join Date: Jul 2009
Location: Katy, Texas
Posts: 1,535
Thanks: 409
Thanked 138 Times in 129 Posts
Groans: 0
Groaned at 5 Times in 5 Posts
Chats: 94
Mudderoy has disabled reputation
Points: 26,732, Level: 1
Points: 26,732, Level: 1 Points: 26,732, Level: 1 Points: 26,732, Level: 1
Activity: 99%
Activity: 99% Activity: 99% Activity: 99%
Default

I have replaced EVERYTHING, the only thing that I saw that made a differnce, but did not fix the problem, was replacing the fan clutch.

I know it isn't supposed to make a difference at highway speeds, but it did.

I made a change this evening that I need to wait until tomorrow to see if it is the solution, but I am very hopeful.

I actually put in a ZJ heavy duty fan clutch. It operates at 70% to 80% compared to the stock XJ fan clutch that operates at 60% to 70%. Hmmm I think I got my numbers right there. You can really hear it.

Now all this in on a 4.0L Jeep engine, but it's in a XJ. The TJ radiator is a different more traditional shape.
Reply With Quote
  #4  
Old 07-14-2009
Mudderoy's Avatar
Mudderoy Mudderoy is offline
Just some guy
Mudderoy's Profile Fields
 
Join Date: Jul 2009
Location: Katy, Texas
Posts: 1,535
Thanks: 409
Thanked 138 Times in 129 Posts
Groans: 0
Groaned at 5 Times in 5 Posts
Chats: 94
Mudderoy has disabled reputation
Points: 26,732, Level: 1
Points: 26,732, Level: 1 Points: 26,732, Level: 1 Points: 26,732, Level: 1
Activity: 99%
Activity: 99% Activity: 99% Activity: 99%
Default

What are your rpms at 70? My tires are a little small for my gears, I run about 2800 rpm at 75 mph.
Reply With Quote
  #5  
Old 07-14-2009
Mudderoy's Avatar
Mudderoy Mudderoy is offline
Just some guy
Mudderoy's Profile Fields
 
Join Date: Jul 2009
Location: Katy, Texas
Posts: 1,535
Thanks: 409
Thanked 138 Times in 129 Posts
Groans: 0
Groaned at 5 Times in 5 Posts
Chats: 94
Mudderoy has disabled reputation
Points: 26,732, Level: 1
Points: 26,732, Level: 1 Points: 26,732, Level: 1 Points: 26,732, Level: 1
Activity: 99%
Activity: 99% Activity: 99% Activity: 99%
Default

Well I just test drove the XJ on the highway. It was dark, but I still had the running hot issue any time of the day.

The needle never got off the 210 mark.

The solution? I don't have a clue. Why? The temp sensor I was using along with the gauge was lying to me. I dug around in the garage this evening and found the original temp sensor and put in back in. My new sensor was reading about 15 degrees hotter than the actual temp.

I also found out (using an IR scanner and a OBD II scanner) that when the needle touches the 210 mark or the left it's 205 degrees. When it touches the 210 mark on the right, it's 220 degrees! The gauge lies!

So I fixed my original problem, but I never knew it because I swapped out the temp sensor. Hmmm come to think of it, I installed the CFS 3 core, and that didn't fix the problem, so I put in a high flow thermostat. I swapped out the temp sensor at that time. Shortly after that the water pump went out, so I replaced the water pump, fan clutch, all the hoses. The temp sensor has been reading high for all that time. I bet it was the water pump that had the issue.

Oh well EVERYTHING is new now! Next problem to solve? The MPG!
Reply With Quote
The Following User Says Thank You to Mudderoy For This Useful Post:
Melissa (07-15-2009)
  #6  
Old 07-15-2009
SUNDANCE's Avatar
SUNDANCE SUNDANCE is offline
Newbie
SUNDANCE's Profile Fields
 
Join Date: Jul 2009
Location: GRAND BAY, ALA.
Posts: 26
Thanks: 0
Thanked 6 Times in 6 Posts
Groans: 0
Groaned at 0 Times in 0 Posts
Chats: 0
SUNDANCE is on a distinguished road
Points: 324, Level: 1
Points: 324, Level: 1 Points: 324, Level: 1 Points: 324, Level: 1
Activity: 99%
Activity: 99% Activity: 99% Activity: 99%
Default

I'll check my rpms to mph,.,.,,. And i replaced the clutch fan also,.,NO I CAN'T HEAR IT WHEN RUNNING.,.

Last edited by SUNDANCE; 07-15-2009 at 04:37 AM.
Reply With Quote
  #7  
Old 07-15-2009
Mudderoy's Avatar
Mudderoy Mudderoy is offline
Just some guy
Mudderoy's Profile Fields
 
Join Date: Jul 2009
Location: Katy, Texas
Posts: 1,535
Thanks: 409
Thanked 138 Times in 129 Posts
Groans: 0
Groaned at 5 Times in 5 Posts
Chats: 94
Mudderoy has disabled reputation
Points: 26,732, Level: 1
Points: 26,732, Level: 1 Points: 26,732, Level: 1 Points: 26,732, Level: 1
Activity: 99%
Activity: 99% Activity: 99% Activity: 99%
Default

Quote:
Originally Posted by SUNDANCE View Post
I'll check my rpms to mph,.,.,,. And i replaced the clutch fan also,.,NO I CAN'T HEAR IT WHEN RUNNING.,.
I couldn't hear mine either, not over the roar of the tires and muffler.

If you can find a IR gun check the temp at the thermostat housing. Make sure you really know what the temp is.
Reply With Quote
  #8  
Old 07-15-2009
SUNDANCE's Avatar
SUNDANCE SUNDANCE is offline
Newbie
SUNDANCE's Profile Fields
 
Join Date: Jul 2009
Location: GRAND BAY, ALA.
Posts: 26
Thanks: 0
Thanked 6 Times in 6 Posts
Groans: 0
Groaned at 0 Times in 0 Posts
Chats: 0
SUNDANCE is on a distinguished road
Points: 324, Level: 1
Points: 324, Level: 1 Points: 324, Level: 1 Points: 324, Level: 1
Activity: 99%
Activity: 99% Activity: 99% Activity: 99%
Default

We must have the same size tires,.,.my rpms and speed is the same as yours.,..mpg.,.huh,.,.,one problem at a time,.,.,.today i went over 500 miles escorting a 18 wheeler,.,.,temp. Ran 210 all day,.,.,.,never had to stop so it never over heated.,,.,.,.normally at hi way speeds 70 + or - .,i get 14-16 mpg.,.if i am following behind the truck ..,i get around 18-19 mpg .,.,i have got as much as 22 mpg (drafting) with a tail wind..,but most of the time it's 14-16..,out front..,but i will work on that(mpg) later.,.
Reply With Quote
  #9  
Old 07-16-2009
Mudderoy's Avatar
Mudderoy Mudderoy is offline
Just some guy
Mudderoy's Profile Fields
 
Join Date: Jul 2009
Location: Katy, Texas
Posts: 1,535
Thanks: 409
Thanked 138 Times in 129 Posts
Groans: 0
Groaned at 5 Times in 5 Posts
Chats: 94
Mudderoy has disabled reputation
Points: 26,732, Level: 1
Points: 26,732, Level: 1 Points: 26,732, Level: 1 Points: 26,732, Level: 1
Activity: 99%
Activity: 99% Activity: 99% Activity: 99%
Default

It sounds like you are not moving enough air through the radiator when sitting idle, or not enough coolant. What shape is your fan shroud in? How about the fan blades? I was considering going with a flex fan and spacer to replace my fan and fan clutch. I really want to go with a high speed electric fan, but that will have to wait.

You may wish to try...

Flowkooler water pump (hesco if you can afford it)
Robertshaw high flow thermostat
Hesco high flow thermostat housing

Those 3 things should increase your coolant flow signafically at low rpms.

The new long block, is it a stroker? How much was it bored over sized? .030, .040, .060?
Reply With Quote
  #10  
Old 07-16-2009
SUNDANCE's Avatar
SUNDANCE SUNDANCE is offline
Newbie
SUNDANCE's Profile Fields
 
Join Date: Jul 2009
Location: GRAND BAY, ALA.
Posts: 26
Thanks: 0
Thanked 6 Times in 6 Posts
Groans: 0
Groaned at 0 Times in 0 Posts
Chats: 0
SUNDANCE is on a distinguished road
Points: 324, Level: 1
Points: 324, Level: 1 Points: 324, Level: 1 Points: 324, Level: 1
Activity: 99%
Activity: 99% Activity: 99% Activity: 99%
Default

Well .,.,i quess i'm just going to chalk it up to thats the way it is.,,.,.,and just don't let it set and idle!!!!! I've tryed all things everyone and said to try..,still no help..,,its not a strocker.,.,and not sure the over bore,,.030 is the norm.,but who knows,..,good question i'll check the paperwork and see if it tell the overbrore.,.,and specks..,.,

with it sitting idling with the rad. Cap off the water is flowing good.,.,,.and seems to be pleny air is being pulled through??? We have blocked off the gap beween the rad. And rad. Support., no change.,.,,i'm tired of throwning parts and money at it,.,.the crate motor is a "atk of north amercia" and has an 3 years or 100,000 warranty..,.,so i'm going to run it and hope it gets better.,.,/(ya rite.,,. Thats going to happen).,,.
Thanks
Reply With Quote
Reply

Bookmarks

Tags
hot, idling, motor, runs
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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

Forum Jump


Advertise with use using Google's Adsense Direct!

All times are GMT -5. The time now is 05:05 PM.

Powered by vBulletin® Copyright ©2000 - 2008, Jelsoft Enterprises Ltd.
Style Provided By: Wrestling Clique - Wrestling Forums

Copyright 2009 - 2016 WranglerTalk.comAd Management plugin by RedTyger

Large Visitor Map

no new posts