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Unread 10-23-2013, 09:57 AM   #1
krazybob
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1988 YJ Wrangler 
 
Join Date: May 2013
Location: mountain home, idaho
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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 ?

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1988 YJ 4.2 5sp
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Unread 10-23-2013, 09:46 PM   #2
uberxj92
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1992 XJ Cherokee 
 
Join Date: Oct 2012
Location: umatilla, florida
Posts: 1,898
150ish on a fresh motor us good. You have great compression for an 88.
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Unread 11-16-2013, 01:17 PM   #3
fastfreddie
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Join Date: Dec 2007
Posts: 518
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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