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XJ Ask the Question Thread
Senior Member



Joined: Sep 2015
Posts: 939
Likes: 71
From: Abysmo, NJ
Year: 1999
Model: Cherokee
Engine: 4.0
Valve springs and seals can be replaced without head removal if you use compressed air or the rope trick (insert coil of rope into cylinder and crank pistion up) to hold the valve in place while you work.
CF Veteran
Joined: Feb 2012
Posts: 6,468
Likes: 18
From: Forest Hill, Maryland
Year: 1998
Model: Cherokee
Engine: 4.0L
As has been pointed out, yes you do need to pull the head to replace valves. First, check compression on that cylinder. If it's good then the valve is sealing OK. No sense on doing all that work if you don't have to. Valve springs and seals can be replaced without head removal if you use compressed air or the rope trick (insert coil of rope into cylinder and crank pistion up) to hold the valve in place while you work.
Yes. No difference.
Also, going to replace the ignition coil today. We shall see.
Junior Member
Joined: Oct 2009
Posts: 91
Likes: 0
From: Bend, OR
Year: 1998
Model: Cherokee
Engine: 4.0L Inline 6
is there a trick to getting this carrier out? It's practically half way out it just wont let go. I watched a video of a guy doing this on youtube and it came out nice and easy..
Last edited by ReconCherokee; Nov 10, 2016 at 05:03 PM.
Herp Derp Jerp

Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
CF Veteran
Joined: Mar 2012
Posts: 1,024
Likes: 2
From: Quebec
Year: 1996
Model: Cherokee
Engine: 4.0L
i recently replaced my coolant temp sensor and i figured it fixed my problem (fan wouldn't kick on when it reached 217)
with the new clutch i rarely see above 210, but it seems that yesterday that happened because with an obdII reader i found out the jeep was around 230. the gauge showed 210 and with an IR temp gun i confirmed it was 230 at the housing.
also had a p0118 code for CTS circuit high. no clue how long it's been there, but since i cleared it yesterday, it didn't come back (no unusual readings this morning when i checked while going to work)
is it possible an air bubble in the system causes weird readings like this? what stumps me is that the sensor reads the right temperature (IR gun and obdII match), therefore the computer should know it's over 217, but it still didn't kick the fan on?
with the new clutch i rarely see above 210, but it seems that yesterday that happened because with an obdII reader i found out the jeep was around 230. the gauge showed 210 and with an IR temp gun i confirmed it was 230 at the housing.
also had a p0118 code for CTS circuit high. no clue how long it's been there, but since i cleared it yesterday, it didn't come back (no unusual readings this morning when i checked while going to work)
is it possible an air bubble in the system causes weird readings like this? what stumps me is that the sensor reads the right temperature (IR gun and obdII match), therefore the computer should know it's over 217, but it still didn't kick the fan on?
Senior Member
Joined: May 2014
Posts: 777
Likes: 5
From: Nolensville, TN
Year: 1998
Model: Cherokee
Engine: 4.0
Ended up taking it to a shop with a diff spreader.
The GOOD news for you is that I suspect that this XJ was in a more-serious-than-a-fender-bender accident based on some of the things that I've found, and that my front axle is slightly bent. But try the rag trick if the box wrench thing doesn't work.
Herp Derp Jerp

Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Herp Derp Jerp

Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
i recently replaced my coolant temp sensor and i figured it fixed my problem (fan wouldn't kick on when it reached 217) with the new clutch i rarely see above 210, but it seems that yesterday that happened because with an obdII reader i found out the jeep was around 230. the gauge showed 210 and with an IR temp gun i confirmed it was 230 at the housing. also had a p0118 code for CTS circuit high. no clue how long it's been there, but since i cleared it yesterday, it didn't come back (no unusual readings this morning when i checked while going to work) is it possible an air bubble in the system causes weird readings like this? what stumps me is that the sensor reads the right temperature (IR gun and obdII match), therefore the computer should know it's over 217, but it still didn't kick the fan on?
P0118 doesn't mean it's "hot", it means there's a short somewhere in the circuit. To trigger that code the PCM is getting back supply voltage instead of something else. Test the new sensor with a multimeter.
As for confirming 230 at the thermostat housing I'm not sure. I'm tempted to suggest that either the gauge sending unit is toast or the thermometer isn't calibrated right. Doesn't make sense that the dash gauge would show an improvement after you did that other work but be faulty





wait...what were we talking about?