oil pressure dropping
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CF Veteran
Joined: May 2011
Posts: 3,380
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From: Partlow, va
Year: 1994
Model: Cherokee
Engine: 4.0 i6, 307 injectors
oil pressure dropping
How do I know if my oil pump is bad? Before when I drive 55mph my oil pressure was 40psi now its about 30
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Joined: Nov 2009
Posts: 15,197
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From: Aberdeen, MD
Year: 1995
Model: Cherokee
Engine: 4.0L HO I-6, 703 Injectors, Brown Dog Super Engine Mounts
how is this advanced tech?
I would verify those numbers with a mechanical gauge - could just be a lazy sensor
Good Readings:
*Not less than 13 psi at HOT idle
*Between 37-75 psi over 1600 rpms
I would verify those numbers with a mechanical gauge - could just be a lazy sensor
Good Readings:
*Not less than 13 psi at HOT idle
*Between 37-75 psi over 1600 rpms
CF Veteran
Joined: Aug 2011
Posts: 1,031
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From: Blue Springs, MO
Year: 1993
Model: Grand Cherokee
Engine: 4.0L Laredo
Unless it's at 0 psi, the only way to know it's bad is by removing it and checking tolerances. Before I did that, i'd check for leaks around your oil pressure sending unit. It could still be bad w/o leaking, but in my experience they leak
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From: Centralia, Wa
Year: 1997
Model: Cherokee
Engine: 4.0
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