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Unread 08-21-2013, 07:01 PM   #1
bmxchan
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1993 ZJ 
 
Join Date: Oct 2012
Location: Christiansburg, Va
Posts: 43
94 xj overheating

Hey guys I've taken off the header and its not cracked and the gasket isn't blown, it's got a new radiator also. What do you guys think is making it overheat and have a little smoke out the tailpipe. It's a 94 and has 110,000 miles on it. Overheats after about 15 minutes.

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Unread 08-21-2013, 08:41 PM   #2
uberxj92
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1992 XJ Cherokee 
 
Join Date: Oct 2012
Location: umatilla, florida
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Do you mean the exhaust header or the engine head?
4.0?
Are you loosing coolant?
Is the a/c on when she gets hot?
Is the electric fan working? How old is the water pump?
Stock radiator hoses?
Are you sure the gauge is accurate? How hot is it when it overheats on you?
Sorry for so many questions. But they are gonna be asked soon.
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Unread 08-21-2013, 09:03 PM   #3
bmxchan
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1993 ZJ 
 
Join Date: Oct 2012
Location: Christiansburg, Va
Posts: 43
Quote:
Originally Posted by uberxj92
Do you mean the exhaust header or the engine head?
4.0?
Are you loosing coolant?
Is the a/c on when she gets hot?
Is the electric fan working? How old is the water pump?
Stock radiator hoses?
Are you sure the gauge is accurate? How hot is it when it overheats on you?
Sorry for so many questions. But they are gonna be asked soon.
Engine head
4.0? yes
Loosing coolant? Yes
A/C? Not working
Electric fan working? Yes
Water pump? 3-4 months
Stock radiator hose? No
Gauge accurate? Not sure how do I test it?
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Unread 08-22-2013, 11:55 AM   #4
uberxj92
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1992 XJ Cherokee 
 
Join Date: Oct 2012
Location: umatilla, florida
Posts: 1,960
Sounds like the head gasket was bad. They don't always look obvious but could've been leaking.
What temp did the gauge say when it overheated?
When it overheated was it steaming or boiling over?
Best way to test the gauge is to use a laser temp gun. I bought one for $20 at harbour freight.
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Unread 08-22-2013, 04:43 PM   #5
bmxchan
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1993 ZJ 
 
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Turned out to be a hairline fracture in the head and the gasket was blown
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Unread 08-22-2013, 06:16 PM   #6
uberxj92
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Location: umatilla, florida
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Ouch
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Unread 08-22-2013, 07:09 PM   #7
bmxchan
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1993 ZJ 
 
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Location: Christiansburg, Va
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image-4191814056.jpg

Between valves on cylinder 1
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