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Unread 01-10-2009, 04:51 PM   #1
DEEPERTHEBETTER
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Losing Oil Pressure ?????

My 94 limited was buried up to the windows for about 3 hours. After got it home i flushed the motor and changed my oil. Now when i crank it up my oil pressure is fine but after driving it a mile or so the oil pressure drops to the bottom and it overheats. I've been messing around with it but cant figure anything out, so any ideas that may help me out will be greatly appreciated.

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Unread 01-10-2009, 05:44 PM   #2
myfirstwj
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are you actually losing pressure or are you trusting your in dash guage? being that dirty can cause random and sparatic signals from your oil pressure sending unit, do 2 things, test it with a manual pressure tester at the sending unit location, and if the pressure is fine there replace that sending unit. my money is there because if you were actually losing pressure you would have developed a knock by now.
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Unread 01-10-2009, 06:13 PM   #3
DEEPERTHEBETTER
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I've already pulled the unit and cleaned it. I am guessing it may be a bigger problem since it is also overheating when the pressure drops. I only drove it maybe 2 miles so it hasnt damaged anything else i hope because theres no knock. I also forgot to mention that it was idled in the driveway for about 30 min. and it never lost pressure until i drove it, there didnt seem to be a loss of power so i have no clue whats happening here.
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Unread 01-10-2009, 06:16 PM   #4
myfirstwj
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i would replace that sending unit. the over heating could be a t stat problem? or possible a fan switch...water does bad stuff. and before i replaced my op sending unit, it would be at like 35 at idle start to drive, drops to 0, rev the motor goes to 40...just replace it
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Unread 01-10-2009, 06:23 PM   #5
SpeedyCat3
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It's probably all the other way around.. Because it is overheating, the oil is thining out too much and making the oil pressure fall down further than normal.
Check your T-stat and solve the overheating problem first. The oil issue most likely needs a new oil sending unit.
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Unread 01-10-2009, 06:31 PM   #6
myfirstwj
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^^ was just listing parts to consider, i know there are 2 seperate issues
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Unread 01-10-2009, 07:19 PM   #7
DEEPERTHEBETTER
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That makes sense, the only reason i had worries of bigger problems was that i read another thread that said it could be bottom end problems. I'll fix the overheating then go from there with the OP unit. Thanks for the help and ill let ya know if it works out
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Unread 01-10-2009, 07:25 PM   #8
SpeedyCat3
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When I replaced the oil sending unit in my son's ZJ, I barely reached back there to get the electric plug unplugged, and I ended up with the whole top end of the switch in my hand. The heat gets them very brittle and they crack, slow oil leaks are not uncommon there.
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