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Loss of compression and Broken Spark Plug

Old Mar 26, 2010 | 09:25 PM
  #1  
ColoradoHills's Avatar
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Joined: May 2009
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From: Denver, CO
Year: 1998
Model: Cherokee
Engine: 4.0 L inline 6
Default Loss of compression and Broken Spark Plug

I had a check engine code come back Misfire in cylinder 2. Turns out that the plug was missing a Tic-tac size piece when i pulled it out of cylinder 2.

The plug is replaced and still running super rough and rich. Rough idle and rough low rpm driving.

I have 25 psi compression in cylinder 2 now as compared to 130 in cylinder 3... Check engine light still on. What are my options now? Am I going to continue to blow plugs due to bad cylinder or is the valve done for?

Options from this point?



thanks
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Old Mar 26, 2010 | 09:31 PM
  #2  
89Laredo's Avatar
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Joined: May 2009
Posts: 10,433
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Year: 2000
Model: Cherokee (XJ)
Engine: 4.0
Default

I would pull the head. What part came out, the electrode?

Sorry to say it, but you might be looking for a new motor.

Best chance: hole in piston
Worst Chance: Torn up cylinder

Here is what happened to a guy on NAXJA:
http://s297.photobucket.com/albums/m...ite%20Failure/
http://naxja.org/forum/showthread.ph...ight=Autolites

Last edited by 89Laredo; Mar 26, 2010 at 09:35 PM.
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Old Mar 26, 2010 | 09:32 PM
  #3  
maverickdan's Avatar
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From: Midlothian, VA
Year: 1996
Model: Cherokee
Engine: 4.0
Default

if you have an air compressor you can get a hose that screws in to the spark plug hole and connect it to the compressor. get both valves closed on that cylinder and listen for air on the intake and exhuast wherever you here air theres your problem. unless you have a hole in the piston
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Old Mar 27, 2010 | 01:04 AM
  #4  
ColoradoHills's Avatar
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From: Denver, CO
Year: 1998
Model: Cherokee
Engine: 4.0 L inline 6
Default

Yeah the top half of the white part what split and missing...

Guess I need someone to take a look and tell me the damage... I'm driving now but its smelling like gas most of the time
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