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My car was recently diagnosed with one cylinder much lower than the others

Tiny
ABBIE841
  • MEMBER
  • 2004 JEEP LIBERTY
  • 88,000 MILES
What could be the most likely causes, and if it is a blown head gasket,
how expensive could that be?

Thanks,
Abbie
Thursday, April 5th, 2012 AT 3:24 PM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If one cylinder is lower than the other, it could be a valve burnt, head gasket, or broken ring or broken piston. It depends on how low it was. Normally 20% is the deciding factor.
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Thursday, April 5th, 2012 AT 3:37 PM
Tiny
ABBIE841
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Test shows cylinder 3 120 psi, all others have 180 psi
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Thursday, April 5th, 2012 AT 3:50 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Then it can be any of the things i've mentioned with the exception of the broken piston/broken ring. Also normally if one cylinder like #3 was low then with a head gasket #5 could be as well.
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Thursday, April 5th, 2012 AT 4:01 PM

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