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Unread 08-25-2011, 08:19 PM   #1
Shellb2414
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1994 YJ Wrangler 
 
Join Date: Nov 2008
Location: North Carolina
Posts: 61
Overheating problem

OK so a friend of mine has a 91 YJ and it started making an clanking noise for lack of a better term a few months ago it only seemed to happen when the gas is pressed down...let off on the gas and it stops...we are still beginners at trying to work on our Jeeps so we took it to the shop to figure out what it was so we could learn how to fix it....well they didnt know but while it was raised it was dripping water...i asked what it was the guy said its the A/C well der we dont even have A/C. so then it has since over heated a couple times. In the last couple of weeks once we turned it off you could here water dripping on to something and making the sizzling steam sound. It had stalled out, gas guage is messed up, thought it was out of gas, turns out it wasnt and had really just stalled out. Filled it up made it about 1/2 a mile and it started to just over heat temp guage was off the charts and pressing gas pedal all the way down it would get slower and slower but we were just trying to make it off the road. This time the coolant resevoir wasnt empty...water was still in it and boiling and smoke was coming from the engine. This time its yet to crank back up...just almost cranks but cant quite make it. We have been coming to this site since we got out Jeeps and have learned so much from all the incredibly helpful people and I appreciate it. I hope someone knows what this might be. Any ideas at all? Thanks!

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Unread 08-26-2011, 06:48 AM   #2
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,549
The fact that you kept driving it when it was overheating is bad news. These motors are pretty durable but cooling is very important. The noise you heard when you were accelerating could have been preignition know because it was running hotter then it should have been or the water pump. Check the oil and see if it has become milky. If you are lucky you might have only blown a head gasket or cracked the head. You probably had a bad water pump or radiator.
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Unread 08-26-2011, 07:17 AM   #3
Andywear
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1991 YJ Wrangler 
 
Join Date: May 2011
Location: Tulsa, OK
Posts: 1,249
If its still all stock its time to change the water pump, rad and thermo.
But if he blew a gasket...... O boy.
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Unread 08-26-2011, 07:44 AM   #4
nembudonna
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1990 YJ Wrangler 
 
Join Date: Feb 2011
Location: northwest, ark.
Posts: 903
Sounds like you might have blown a head gasket. Not a real hard thing to fix. Check to see if you have compression.
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Unread 08-26-2011, 04:41 PM   #5
Shellb2414
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1994 YJ Wrangler 
 
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Location: North Carolina
Posts: 61
what does the milky oil mean?
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Unread 08-26-2011, 04:42 PM   #6
Shellb2414
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1994 YJ Wrangler 
 
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Location: North Carolina
Posts: 61
and how can we check to see about compression? thanks so much for the info!
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Unread 08-26-2011, 06:33 PM   #7
oldtime_ironman
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1991 YJ Wrangler 
 
Join Date: Dec 2010
Location: 14304 Niagara Falls, NY
Posts: 2,540
The milky oil would be a blown head gasket or a cracked block/head. It means "don't drive it at all till its fixed".

You can check the compression with a compression tester, available at most any auto parts store. The compression test will also tell you a lot about the internal condition of the engine.

Either way, its a miracle that it held together so far. You are more than likely looking at doing some real work on it.

.
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