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Unread 11-29-2006, 03:56 PM   #1
Briandl
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Is My Oil Pressure Too High?

So I was going to ask if this was normal and if I had just never noticed it, but I'm sure it's not and I'm sure I would have noticed it.

Just a while ago I went out and I noticed that under acceleration my oil pressure gets as high as 75, and drops down to about 68 when I'm at cruising speed.

I've read some general info about oil pressure but I'd prefer more specific Grand Cherokee info about oil pressure.

I've read it could be the sending unit, pump itself, pressure relief valve, or just the gauge...

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Unread 11-29-2006, 03:58 PM   #2
rrubio
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Had the same thing happend to me this past summer.I ended up getting a new oil sending unit and that was it.
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Unread 11-29-2006, 04:02 PM   #3
Briandl
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Quote:
Originally Posted by rrubio
Had the same thing happend to me this past summer.I ended up getting a new oil sending unit and that was it.
Is this the one that's on the side of the engine near the filter?

I was reading some threads on JU and I read about that a couple of times, heard it's a cheap part.

Incase anyone asks, I changed my oil about 1500 miles or so and I change it regularly, Castrol Syntec/K&N Oil Filter...
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Unread 11-29-2006, 04:07 PM   #4
Briandl
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Also, how bad is it to drive around like this, does this just affect the reporting of the oil pressure?
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Unread 11-29-2006, 04:12 PM   #5
-Joe-
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Reporting of the oil pressure to what?

It only reports it to the gauge. .
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Unread 11-29-2006, 04:12 PM   #6
rrubio
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Quote:
Originally Posted by Briandl
Also, how bad is it to drive around like this, does this just affect the reporting of the oil pressure?
Not sure how bad it is to drive around like that.I got mine at the dealer cause my local auto parts strore would of had to order one and I did not want to wait a few days.Easy to get to and to replace.
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Unread 11-29-2006, 04:17 PM   #7
greasefingers
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For the 4.0L engine: the oil pressure at 600 rpm should be around 13 psi. At 1600 rpm and higher the pressure should be between (37 – 75psi)

Note this is out of a 1993 to 1996 factory service manual.
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Unread 11-29-2006, 04:27 PM   #8
Briandl
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Is this the one:



I've also read it could be a coil rail?
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Unread 11-29-2006, 04:28 PM   #9
rrubio
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Quote:
Originally Posted by Briandl
Is this the one:



I've also read it could be a coil rail?
Thats it.........
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Unread 11-29-2006, 04:32 PM   #10
01ACRViper
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my gauge nearly always reads right around 70, whether idling or at interstate speeds
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Unread 11-29-2006, 04:42 PM   #11
Briandl
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So how do I know it's not the coil rail?
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Unread 11-29-2006, 04:59 PM   #12
rrubio
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Quote:
Originally Posted by Briandl
So how do I know it's not the coil rail?
Cause I said so .That is definetly your oils sending unit.
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Unread 11-29-2006, 05:03 PM   #13
Briandl
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Quote:
Im guessing your oil pressure going crazy??? Its probably not the sensor....if you are trying to fix it... I had the same problem on the wives and before I read WJJEEPS (and asked milous) I had replaced it and it didnt fix it ...new coil rail fixed it though (hairline cracks caused by changing plugs can cause spike in PCM and cause oil gauge to spike and just sit at like 80).

Quote:
Exactly if it pegs and then doesnt move with rpms...its sending unit....but if it moves and just seems to be way too high its a crack in the coil rail
He kind of contradicts himself a bit though....
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Unread 11-29-2006, 05:18 PM   #14
rrubio
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Quote:
Originally Posted by Briandl
He kind of contradicts himself a bit though....
My oil gauge was moving up high just like yours and when I gave it gas it would go even higher.After I replaced the sending unit,it was fixed.That is a cheaper fix than doing your coil rail.Im sure it's your sending unit.
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Unread 03-08-2011, 08:02 AM   #15
mratko
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Gr Cherokee 2002 158k miles 4.0L

So if that photo above is the oil sending unit to the rear of the oil filter, what is this just to the front (or right in the pic) of the oil filter?

My gauge is now pinned to the max. When I turn off the engine, it goes to zero. I do not see any fluctuations in the gauge while driving. Oil is at the proper level (10W30).

Thanks for your help....

Mike

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