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I have 1993 Jeep Wrangler, when i start up the the truck the oil pressure goes up. After driving it, it goes all the way up to 80...After that it will go all the way to Zero while driving it. I cant find any oil on the ground i check the oil filter its tight also i just changed my oil using 10 w 30 oil...Is it the oil pump...or is it the sensor and how will i know if the heads are cracked? Thank you
 

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From the sounds of it, and I'm guessing the engine isn't knocking when the pressure is reading 0, I'd say you have a bad oil pressure switch.
 
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