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Old 07-29-2012, 03:25 PM   #1
T.C.'S TOY
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Default You Mechanics out there

HELP ...Got a good friend that has a TJ and runs great and in the heat of the day while crawlin heats up(only in the heat of day)Got new radiator,waterpump,new fan clutch,thermostat,done a comprssion check and ok,no water in oil or vise versa.runs great when it heats up hard to start wants to throw codes runs rough,clear codes and its fine,codes thrown are misfires in three and four cylinders,could there be a computor problem?
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Old 07-29-2012, 03:53 PM   #2
xjtrailrider
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What year? 99-00 have issues with the heads cracking. Search 0331 cylinder head. While you may not be getting coolant in the oil or vice-versa if the system becomes unpressurized it will overheat.
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1989 MJ,
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Old 07-29-2012, 03:58 PM   #3
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Quote:
Originally Posted by xjtrailrider View Post
What year? 99-00 have issues with the heads cracking. Search 0331 cylinder head. While you may not be getting coolant in the oil or vice-versa if the system becomes unpressurized it will overheat.
Sorry 2001 4.0
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Old 07-29-2012, 06:05 PM   #4
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Quote:
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Sorry 2001 4.0
I would pressure test the coolant system. You can rent a pressure tester at AA, AZ or Oriellys

Once you get the pressure to whatever is on the cap, 16psi most likely then you should be able to tell where the leak is.
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1996 XJ Country Trail Rig w/lots of stuff
1990 XJ Laredo stock/new motor installed, resto-mod done!
1989 MJ,
2000 XJ Classic stock, my son's
1994 XJ stock beater
2008 JK Sahara (POS!) at least it has a SFA!
2009 Hemi Commander (Awesome Jeep) Wish it had a SFA:-(
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Old 07-30-2012, 06:30 PM   #5
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will doo,thanks for your help
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