True or false ? - JeepForum.com

 
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post #1 of 10 Old 12-28-2012, 06:50 AM Thread Starter
pacreeker
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True or false ?

If I have a cracked cylinder will there be coolant in my oil 100 percent of the time?

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post #2 of 10 Old 12-28-2012, 07:34 AM
Kalali
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Do you mean cylinder head or the actual cylinder lining? If former, the answer is not always. It depends on the location of the crack.
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post #3 of 10 Old 12-28-2012, 07:45 AM
bigbill888
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I'm gonna say if the piston rings go above the crack, then yes there will be coolant in the oil 100% of the time.

96 ZJ Laredo, 4.0, 242, 230K
95 ZJ Limited, 4.0, 242, 140K
98 XJ Sport, 4.0, 231, 140K
All work well
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post #4 of 10 Old 12-28-2012, 08:03 AM Thread Starter
pacreeker
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Sorry I'm not sure I know the difference? I'm a total novice. I'm having an issue with my jeep. Was told that i may have a cracked cylinder.

I've had my 01 xj in a couple garages in the north eastern pa area and I can't seem to get anyone to give me a good diagnosis....the jeep has a new radiator, new coil pack, and a new crank position sensor, new thermostat.
I Hooked up the code reader and I'm getting misfires in all cylinders. Sometimes it happens right away, some times I might drive 10 miles before it happens usually when I'm I'm going up hills or if driving on the highway and slow down due to traffic.
As if that weren't enough i also have a high pitched whistling noise when I let off of the gas pedal I don't know if the two are related or not?
Any one have any ideas? I've had a compression test done and the garage said everything looked normal.
Anyone have any idea? I'm at a loss.... Suggestions..cam sensor?
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post #5 of 10 Old 12-28-2012, 08:17 AM Thread Starter
pacreeker
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Also the jeep seems to run sluggish when all of this happens, when it goes into slug mode the car will not have any power over 3000 RPMs. Thanks for the help fellas ....
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post #6 of 10 Old 12-28-2012, 08:19 AM Thread Starter
pacreeker
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Could if be carbon build up on one or more of the valves?
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post #7 of 10 Old 12-28-2012, 08:50 AM
Paradise XJ
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Quote:
Originally Posted by pacreeker View Post
Was told that i may have a cracked cylinder.

I'm getting misfires in all cylinders. I've had a compression test done and the garage said everything looked normal.
First of all, don't believe everything somebody tells you. Are you sure they didn't say cracked cylinder HEAD. Being an '01 that is entirely possible.

But, if your compression test showed all good then the cause is not likely to be a cracked cylinder (or even a cracked head). I'm pretty sure it would be something electrical or fuel related.

1990 XJ Laredo - White & Chrome
1988 MJ Pioneer - Metallic Green and Black
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post #8 of 10 Old 12-28-2012, 09:36 AM
buildin1XJ
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On a 2000 or 01 Cherokee 4.0 you have a 0331 head which is known to crack and does so in between #3 and #4 cylinders.If you have unexplained coolant loss it is most allways caused due to a cracked head,and in some cases compression tests will still fall within spec.A leak down test or coolant system pressure test will provide better results.Have you looked at the bottom of the oil cap for sings of milky colored oil? Most of the time you will find that prior to seeeing signs of coolant in the oil pan.If you continue driving the vehicle the way it is and coolant gets to the bottom end of the engine it wiil not take long before the engine will go as well.I would highly suggest parking your Jeep untill it is repaired.If you find that you have a cracked head which I highly suspect the head should be replaced with either a new head from Clearwater Heads or a TUPY 0331 head from a 2003 or o4 Wrangler or GC Both the Tupy and clearwater heads have been beefed up in the area where they are known to crack.I myself have replaced many of the 0331 heads and most allways use the new Clearwater head.A google search of cracked 0331 heads will provide you with a lot of information.I myself have two 2000 models in my driveway waiting on engine replacement because of the cracked head problem where the PO did not quit driving them untill it was to late.
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post #9 of 10 Old 12-28-2012, 09:44 AM
GetLifted
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So is it loosing coolant? Did I miss that?
Quote:
Originally Posted by pacreeker View Post
Also the jeep seems to run sluggish when all of this happens, when it goes into slug mode the car will not have any power over 3000 RPMs. Thanks for the help fellas ....
This sounds like my problem I had when the CKS/CPS wires began to fail in the loom.
http://www.jeepforum.com/forum/f11/w...45/?highlight=
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post #10 of 10 Old 12-28-2012, 10:34 AM
sAe23
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Quote:
Originally Posted by pacreeker View Post
[snip]
I've had my 01 xj...
[snip]
Just a suggestion: Fill out your PROFILE, or offer up important info like this in your FIRST POST, so people won't have to guess.
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