2003 Jeep Liberty losing compression

Tiny
DCKELLER
  • MEMBER
  • 2003 JEEP LIBERTY
  • 3.7L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 107,234 MILES
After a check engine light, after having the diagnostic scanner applied, the code revealed the engine is losing compression in cylinder #5. Is this a serious problem?
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Sunday, April 5th, 2015 AT 11:32 AM

4 Replies

Tiny
HMAC300
  • EXPERT
You mean it's amisfire on #5 if it's losing compression yes it can be serious but it should be checked manually with a gauge first. It can be a lot of other things causing the misfire.
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Sunday, April 5th, 2015 AT 3:47 PM
Tiny
DCKELLER
  • MEMBER
Hmac300. Thank you for your insight! I'm still unsure of your response. A miss-fire as opposed to losing compression. A miss-fire; refers to spark, and the explosion of fuel vapor contained in the cylinder, driving the piston back downward. Yes? Lost compression; refers to a seal or ring at the top or bottom of the cylinder which has become worn or damaged, allowing some of the exploding fuel vapor to escape, therefore robbing the downward thrust of the piston of some of it's momentum. Correct? How would a skilled mechanic repair each of the two scenarios. Thank you again for your time!
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Monday, April 6th, 2015 AT 4:34 PM
Tiny
HMAC300
  • EXPERT
You have to find the cause of the compression loss first which can cause the misfire. If it's a valve bad or piston bad(rarely nowadays) then you tear engine apart to find the cause and fix it. That may cure the misfire, if not then you have to other things like scan for codes and check fuel pressure among other things like a vacuum leaks. There is a lot that goes into it and to much to explain here.
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Monday, April 6th, 2015 AT 4:54 PM
Tiny
DCKELLER
  • MEMBER
Hmac300 thank you! I have a much better understanding now, with your additional details. Thank you! DCKeller
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Monday, April 6th, 2015 AT 5:06 PM

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