Need the XJ to run HOTTER
#1
Junior Member
Thread Starter
Join Date: Jun 2012
Location: Arkadelphia, AR
Posts: 57
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1998
Model: Cherokee
Engine: 4.0L
Need the XJ to run HOTTER
I know this is exactly opposite to most of the posts on here! But a month or so ago, I had to have my head replaced from cracking due to overheating issues. When it was torn apart, I went ahead and replaced the rad, water pump, T Stat, upper and lower hoses and had the block flushed. The only thing that isn't a stock replacement is the water pump, it's just an upgraded high flow from Murray. Now at least on the temp gauge, I'm reading roughly 150-160 running around town without my e-fan on a toggle switch, on. The only time I get up to normal (about 210) is when I'm in a drive through for a while. How can I get this sucker to run a little hotter and get my gas mileage back up? I know it decreases with it running cooler. (Doesn't it?)
#3
Junior Member
Thread Starter
Join Date: Jun 2012
Location: Arkadelphia, AR
Posts: 57
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1998
Model: Cherokee
Engine: 4.0L
I put one of the Ultrafail T Stat's in it, the ones with the two stroke design where if it overheats, it stays stuck open. But yes, a 195.
#4
CF Veteran
Join Date: Aug 2011
Location: Nor-Cal Coast
Posts: 10,489
Likes: 0
Received 17 Likes
on
17 Posts
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
It's almost certainly the t-stat or the gauge. You can test the t-stat in a pot on the stove, auto parts store might loan you an IR temp gun to check the t-stat housing temp.
Being supper over rich can lower the temp sometimes....
Being supper over rich can lower the temp sometimes....
#5
Junior Member
Thread Starter
Join Date: Jun 2012
Location: Arkadelphia, AR
Posts: 57
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1998
Model: Cherokee
Engine: 4.0L
Now how could I adjust it to make it run leaner? I wish we had an IR gun to loan...I work at O'Reilly's...I hope it might just be the T stat, that's an easy fix.
Trending Topics
#9
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,875
Received 1,526 Likes
on
1,238 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
52028186 stat from the dealer.
They're made in Israel, not china.......
They're made in Israel, not china.......
#10
Junior Member
Join Date: Jul 2013
Location: Dayton, Ohio
Posts: 52
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1997
Model: Cherokee
Engine: 4.0 High Output
Mine had the same issue with an ultrafail wouldn't hit 210 even when wheeling. Replaced it with a normal 195 problem fixed.
#12
Member
Join Date: May 2011
Location: West Virginia
Posts: 139
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1994
Model: Cherokee
Engine: 4.0
Until your engine hits 195 it is running in open loop (not using o2 sensor) andfigures out how much gas to inject by guessing off vacuum and something else. Once 195 is reached it uses the o2 to calculate more precisely (closed loop)
#13
CF Veteran
Join Date: Nov 2009
Location: The Republic of TEXAS
Posts: 8,172
Likes: 0
Received 14 Likes
on
14 Posts
Year: 1998
Model: Cherokee
Engine: 4.0L HO
The facts are, Jeep dealerships sold a 180F 4.0L t-stat and your engine enters "closed" loop within seconds of cold start-up. When the heated O2 reaches operating temp of 600F-650F is when the loop "closes, NOT when/because coolant temp reaches 195.
Folks.......please quit posting this false info.
http://www.picoauto.com/applications/lambda-sensor.html.
Last edited by djb383; 10-20-2014 at 11:17 AM.