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Old 04-10-2011, 10:07 PM   #1
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Compression

I did a compression check today on my 08 JK w/ 38588 miles. All cylinders were 130psi to 133 psi range except for cyl 1..it was at 135 psi. I don't know what they should be but that seems good to me. The spark plugs were burning almost pure white with very little to no deposit around the electrode.

Tom

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Old 04-10-2011, 10:10 PM   #2
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as long as all cylinders are within 10% of of each other your good

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Old 04-10-2011, 10:18 PM   #3
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Quote:
Originally Posted by Tuggin View Post
I did a compression check today on my 08 JK w/ 38588 miles. All cylinders were 130psi to 133 psi range except for cyl 1..it was at 135 psi. I don't know what they should be but that seems good to me...
From the FSM: "Compression should not be less than 689 kPa (100 psi) and not vary more than 25 percent from cylinder to cylinder."
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