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My oil pressure drops big time at idle

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My oil pressure drops big time at idle

Old 08-21-2013, 05:47 PM
  #1  
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Join Date: Aug 2013
Location: mantua, nj
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Year: 2000
Model: Cherokee
Engine: 4.0l
Default My oil pressure drops big time at idle

My oil pressure drops to almost zero at idle...according to dash gauge. Throws the check gauges light. 138k miles, great compression, no oil burn, very very very slight valve tap at idle. Oil is 10w40
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Old 08-21-2013, 08:50 PM
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Location: Long Beach, Ca
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Year: 2000
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Oil pressure switch is probably bad. I just replaced mine as it was leaking by into the wiring harness making it seem I had low or no oil pressure at idle.
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Old 08-22-2013, 09:34 PM
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Join Date: Feb 2010
Location: Waterford Township, NJ
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Year: 1991
Model: Cherokee
Engine: 4.0
Default Uh-oh

Bad rings = smoke at tail pipe
Bad bearings = low oil pressure

Try the cheap fixes first, sending unit, gauge, etc

Are you the original owner?

Good luck
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