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Can't find the oil pressure sender


 
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JohnF
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Joined: 30 Aug 2006
Location: Salida, co

PostPosted: Thu Sep 07, 2006 1:19 pm    Post subject: Can't find the oil pressure sender Reply with quote

1998 Jeep Wrangler 4.0l straight 6. Oil pressure jumping around, so I got a replacement oil pressure sender from JC Whitney. Problem is it is a typical sender, round, about 1.5' diameter or so, and one terminal.

Can't locate anything like that on the engine. I suspect that a black glob that protrudes aft from just immediately above the oil filter mount is the original sender but cannot be certain. It has two leads coming from it.

Can someone point me in the right direction> I would appreciate it.
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swamp boy
Cherokee Muderator
Cherokee Muderator


Joined: 01 Jan 2004
Location: New Orleans LA.

PostPosted: Thu Sep 07, 2006 8:27 pm    Post subject: Reply with quote

Not sure on the 4.0 but on the 5.2 its at the back of the engine near the fire wall.. Its pretty big but I dont think its 1.5 more like 1 1/8 ...

Good luck..
_________________
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Unless you include the sawzall work..

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RussellRowell
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Joined: 09 Feb 2006
Location: Jacksonville Florida

PostPosted: Tue Sep 12, 2006 9:00 pm    Post subject: Reply with quote

Hope this helps

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JohnF
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Joined: 30 Aug 2006
Location: Salida, co

PostPosted: Wed Sep 13, 2006 9:52 am    Post subject: Finding oil pressure sender Reply with quote

Thanks to Russell I located the oil pressure sender and removed it from my 4 L Wrangler and compared it to the replacement from JC Whitney. They were two completely different units and I could not use the "replacement." Out of frustration I took the unit from the Wrangler and washed out the oil input hole with acetone and blew it dry with an air hose. I replaced the original unit and test drove the Jeep. I got 50-psi oil pressure per the gauge. I have never had that much. It always read 40-psi and lately that varied a lot from 2 or 3-psi and would often "linger" around 20-psi.

I noted in the can that I cleaned the sender in that there was a fair amount of sandy-looking black debris that had washed out of the sender.

The "replacement" is going back to JC Whitney and unuseable.

FWIW
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Gamgan
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Joined: 02 May 2005

PostPosted: Fri Sep 15, 2006 4:10 am    Post subject: Reply with quote

I have a 98 4.0L and had trouble getting the oil sensor at Pepboys


It seems that 2 different sensors where installed into wranglers for that year. The sensor that they had listed for my jeep in their parts books didnt fit my jeep, and they finnaly found the correct part that was used, seems it was also used for a truck that same year

I didnt copy down the part number, but if you have trouble getting it, I think I can go back to the store and get the correct sensor number for you since its close by ( that is, IF you have the same sensor that I did in my jeep)
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Gamgan
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Joined: 02 May 2005

PostPosted: Thu Sep 21, 2006 7:28 pm    Post subject: Reply with quote

Did you ever find the correct sensor? I have been thinking about pulling out my old sensor and taking it to the parts store so they can find for me again the correct one

I cant remember exactly but I believe it was pick up truck from that same year that had the same oil sensor as my jeep
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JohnF
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Joined: 30 Aug 2006
Location: Salida, co

PostPosted: Thu Sep 28, 2006 2:11 pm    Post subject: Erratic Oil Pressure Sender "Fix" Reply with quote

Since I washed out the oil pressure sender on my 1998 Jeep Wrangler it has work flawlessly. It reads nearer 50PSI, while previously it read about 42PSI, but now it is rock steady.

That thing is just a variable resistor and like the volume controls on audio devices crud can form if the resistive part is a carbon surface. The washing with acetone or smiliar fluid rinses out the 'dust' and clears up the erratic readings. Save yourself some money and try it if the "Jeep Creep" hits you.
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Hammer
Member


Joined: 04 Oct 2006

PostPosted: Wed Oct 04, 2006 10:54 am    Post subject: Reply with quote

The information center on my 93 Jeep Grand Cherokee has a flashing check oil message. I checked the oil and it is fine. Could this be a faulty oil pressure sending unit?
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