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Discussion Starter · #1 ·
I just put new guauges in my 88 wrangler 4.2 and need to know what the "normal" operating temperature is seems to be running a bit hot 195 - 205 range
can't find it in my repair manual does anyone suggest a repair manual that is better than chiltons
 

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I got nothin'
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That is normal temp for the 4.0L, but I am not sure about the 4.2L. I would guess that that is the normal range.
 

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NO! The Jeep 4.2 & 4.0 are designed to run at 210. Anything "cooler" will cause emissions issues.
 

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thats what i did with my 4.0 in the cherokee and i actually passed emissions with flyin colors maybe i was lucky
 
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