compression for a 4.2L motor ? -
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post #1 of 3 Old 10-23-2013, 09:57 AM Thread Starter
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1988 YJ Wrangler 
Join Date: May 2013
Location: mountain home
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compression for a 4.2L motor ?

I checked my compression in my 1988 4.2L engine, and all cylinders are right at 130# Can someone tell me what the optimum pressure should be so I can tell how my engines compression compares ?

Krazybob,, Mtn. Home, Idaho
My goal, is to die young,,
at a very old age
1988 YJ 4.2 5sp
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post #2 of 3 Old 10-23-2013, 09:46 PM
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1992 XJ Cherokee 
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150ish on a fresh motor us good. You have great compression for an 88.
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post #3 of 3 Old 11-16-2013, 01:17 PM
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The important thing with compression checks is, as in your findings, the numbers are the same across the board. That's impressive for an older engine.
A leak down test is prolly what you're looking to do to find out if the engine is tired.
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