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Unread 07-17-2010, 08:24 PM   #1
MinTX
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1998 XJ Cherokee 
 
Join Date: Apr 2010
Location: Austin, TEXAS
Posts: 69
Oil Pressure Sending Unit?

I admit, I am a Jeep 'tard!
I have a 1994 Cherokee Sport, which I have been enjoying immensely.
It leaked fluids like nothing going when i bought it, so I replaced the valve cover gasket, which was probably unnecessary, as I discovered the rear bolts were barely tightened. Then I replaced the transmission pan gasket, as it was leaking and discovered that the PO (I assume) had allowed the gasket to slip when they replaced it and an entire corner was not sealed at all.
So I have gone two weeks with no bodily fluids draining on my now clean driveway.
TODAY, my son started it and I peeked under to see oil pouring onto the driveway.
GAAAAAAAAAH!
Popped the hood and discovered this part had apparently come apart at the end.
It is a piece of rubber (I think) and I can push it back with my fingers, but as soon as the engine is engaged, it pops off again. It feels like there are wires that attach somewhere, but I ran out of daylight so I cannot tell where they lead. Where do the wires go?
The second pic is pretty crappy, but hopefully y'all will get the idea.

engine-off.jpg   running.jpg  
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Unread 07-17-2010, 08:32 PM   #2
portcityXJ
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looks like the actual sensor has come apart, instead of the oil pressure gauge unit. take a trip to the JY and snip one off a donor and wire it in.
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Originally Posted by EricRollerSkate View Post
Do they come in any other varieties besides crap?
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Unread 07-17-2010, 08:45 PM   #3
moonshinefuel
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That is your oil pressure sensor switch. Replacing the rubber back into the top will likely do little. It needs to be replaced if it is leaking. Cheap parts store replacements tend not to last, if you do get a parts store one, get one with a lifetime warrantee. You will need it. Best route is to replace it with an oem jeep dealership sensor. A bit pricey though. I replaced mine with a 15 dollar mechanical gauge from a parts store. So now I have an aftermarket oil pressure gauge. Got tired of those things popping on me.
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Unread 07-17-2010, 09:27 PM   #4
shawnzoman
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That is the switch gone bad. Mine did this a couple months ago. The actual switch starts to leak oil and it goes into the plug part and builds pressure and then pushes the rubber piece out. Replace it asap. I waited a day to late and at 4 am headed to work mine pretty much gave out and I lost about half of my oil before I noticed the smoke billowing in my rearview. I replaced mine with a autozone part and it has worked fine. Although the dealership part would be better if you don't mind spending the money.
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Unread 07-17-2010, 09:38 PM   #5
moonshinefuel
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Careful taking it off, it looks like you have the elbow into the block. Just apply even pressure when unscrewing it, and don't overtighten or under tighten the new one when putting the replacement back on. I would be very concerned about driving it at all until you get it fixed as well. Engines don't do well with no oil.
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Unread 07-17-2010, 09:44 PM   #6
BassMasterCHS
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Mine did the same thing. I couldn't believe I was losing that much oil from a stupid sensor!
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Unread 07-17-2010, 10:02 PM   #7
MinTX
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Quote:
Originally Posted by BassMasterCHS View Post
Mine did the same thing. I couldn't believe I was losing that much oil from a stupid sensor!

I looked down and thought... d*mn... looks like it is bleeding!
Fortunately I had not taken off in it yet... that could have been ugly!
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Unread 07-18-2010, 09:16 AM   #8
MinTX
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Looking for parts...
Are oil pressure switch and oil pressure sending unit two different terms or are they essentially interchangeable terms?
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Unread 07-18-2010, 09:25 AM   #9
shawnzoman
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Same thing I believe just make sure it looked like yours. There is one for a gauge and light I believe. You have the gauge.
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Unread 07-18-2010, 12:24 PM   #10
MinTX
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aaaaaaaaaaaaand... I broke the clip on the cotton pickin' wiring harness.
GAH!
All the junk yards are closed....
*shoot me now!
This should have been simple... but noooooooo
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Unread 07-18-2010, 09:40 PM   #11
MinTX
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Got the sensor installed, and taped the heck out of the harness, but somethig still is not right. I am not happy with the gauge readings.
It is reading about 60 at idle and 80 when accelerating, higher than it was.
Any clues?
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Unread 07-18-2010, 09:46 PM   #12
shawnzoman
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Well if the one before was leaking then it was not getting a correct reading. I'm sure due to the lack of good pressure it was reading below what it should. I don't believe those numbers are outrageous. After I drive mine a while the pressure decreases a bit. Did you drive around any or just crank it and get those numbers?
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Unread 07-18-2010, 09:46 PM   #13
MinTX
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drove it around and no change
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Unread 07-18-2010, 09:49 PM   #14
shawnzoman
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I woudln't worry too much. What was it reading before?
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Unread 07-18-2010, 09:49 PM   #15
MinTX
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BTW, I taped it because I broke the damn clip!
Grrrrrrrrrrr!
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