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Posted: 3/8/2010 2:42:03 PM EDT
I have a 2000 Jeep Cherokee 4.0.

I am reading around 80 on the oil Pressure gauge when idling, at speed, whenever, with the engine on.

40-50 used to be the norm.

I changed the oil and still sit just under 80 with the engine on.

I am reading 40 psi with the accessory switch on, engine off.

Bad Oil pressure sender?

Where is the sender located?

I cannot find a reference to it in my Haynes manual.

Any feedback is appreciated.
Link Posted: 3/8/2010 4:08:08 PM EDT
[Last Edit: 3/8/2010 4:14:24 PM EDT by 82nd_Sapper]
This is a pretty common problem, and if I remember correctly it is a bad sending unit.  The oil pressure sending unit is near the oil filter.

The part is only about $20.

ETA: here is a picture
Link Posted: 3/8/2010 4:11:39 PM EDT
Is 80 the max on the gauge?
Link Posted: 3/8/2010 4:15:10 PM EDT
[Last Edit: 3/8/2010 4:16:38 PM EDT by 82nd_Sapper]
Originally Posted By OLY-M4gery:
Is 80 the max on the gauge?


Normal pressure should be in the ~40-50 range.

Sometimes if you switch to a thicker oil it will do this.

My Cherokee did it at random for a while then went back to normal.  I just ignored it.
Link Posted: 3/8/2010 4:20:16 PM EDT
I just looked up the check procedure I used last time.

1> unplug the wire, the gauge should read zero.  If the gauge reads 80 then it is a bad gauge.  If the gauge reads zero go to step 2.

2>  ground out the wire that goes on the sensor.  If the gauge smoothly moves to 80, then you need a new sensor.
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