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2G 4G64 Cylinder Compression


Proven Member
Jun 20, 2018
Astoria, New_York
Hi all!

I was able to run a compression test today on my 119k 4G64. The values were higher than the service manual so I'm wondering if there is a problem. I attempted to do the test on each cylinder 3 times to verify the gauge wasn't faulty. The values were:

Cylinder 1: 240psi
Cylinder 2: 230psi
Cylinder 3: 245psi
Cylinder 4: 230psi


Probationary Member
Jun 11, 2012
Ozark, Missouri
Does sound pretty high. Normally they should be around the 160-170 psi range. Is it stock or built? Probably have detonation or some issue like that
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