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Oil pressure gauge is fluttering up and down

Tiny
TOPGUN
  • MEMBER
  • 1996 JEEP GRAND CHEROKEE
Hello, my oil pressure gauge is fluttering up and down, it goes below 40 when idling, then goes up when driving, what could cause this?Is this natural (common). Or could it be my oil pump going bad?THANK YOU!

My oil gauge goes down below 40 when idling, then goes up when driving, is this natural, or is my oil pump going bad?
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Thursday, February 23rd, 2012 AT 11:43 PM

11 Replies

Tiny
BILLYMAC
  • MECHANIC
  • 2,204 POSTS
Hi well kind of normal for this car you can replace the oil sending unit may straighten up. You can have the pressure tested with a manual guage to see exactly what it is. But honestly if not ticking and not below 30 psi prob not really a problem. Good luck
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Friday, February 24th, 2012 AT 12:36 AM
Tiny
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  • 11 POSTS
Where is the oil sending unit located, so I can replace it, if have to.I'll try that, if doesn't straighten out, i'll try a pressure test.
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Friday, February 24th, 2012 AT 1:09 AM
Tiny
TOPGUN
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  • 11 POSTS
Can you send a picture of the oil sending unit?Thank you!
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Friday, February 24th, 2012 AT 1:14 AM
Tiny
BILLYMAC
  • MECHANIC
  • 2,204 POSTS
Here you go
Image (Click to make bigger)
Thumb
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Friday, February 24th, 2012 AT 1:40 AM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
THIS MAY SORTA AID YOU TOO

https://www.2carpros.com/questions/1999-chrysler-lhs-car-off-oil-level-full-started-drops-below-low-light-comes-on

THE MEDIC
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Friday, February 24th, 2012 AT 5:14 AM
Tiny
TOPGUN
  • MEMBER
  • 11 POSTS
Can you show me or let me know where this oil sending unit is so I can replace it?P.S. The engine is not making a ticking or a knocking noise, just thought I let you know. Thank you!
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Friday, February 24th, 2012 AT 11:08 AM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
WHAT ENGINE YOU GOT?

IS THERE ANY MORE SPECIFICS AS TO YOUR GRAND CHEROKEE'S NOMENCLATURE (LIMITED, LARADO, ETC)?

I MAY BE ABLE TO GET YOU A DIAGRAM

THE MEDIC
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Friday, February 24th, 2012 AT 2:04 PM
Tiny
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  • 11 POSTS
It's a 1996 grand cherokee laredo, 5.2 engine.
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Friday, February 24th, 2012 AT 2:24 PM
Tiny
TOPGUN
  • MEMBER
  • 11 POSTS
Can you show me or let me know where the oil sending unit is located, for a 1996 jeep grand cherokee laredo, I want to replace it, if this is causing my oil pressure gauge flutterating, thank you!
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Friday, February 24th, 2012 AT 7:54 PM
Tiny
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The engine is a 5.2L
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Friday, February 24th, 2012 AT 7:56 PM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
I LOOKED AT ALL AVAILABLE DIAGRAMS--IT IS NOT SHOWN

I LOOKED UP "SENDING UNITS", ON THE CHART, IT SAYS THAT THE OIL PRESSURE SENDER IS "NEAR THE DISTRIBUTOR"

SO YOU MIGHT GAZE AT THE PIC OF WHAT THE PART LOOKS LIKE, AND SEARCH ALL AROUND THE DISTRIBUTOR.

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Saturday, February 25th, 2012 AT 2:09 AM

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