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Unread 03-02-2013, 06:07 PM   #1
rubinscube
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I have read the posts and still need advice on oil pressure gauge issue

1988 yj with 4.2
gauge pegs at 80 psi when I started vehicle.

I changed the only sensor I could find on the passenger side/ lower engine / 2 prongs with no success, and I am unable to find the short.

many posts have another sending unit by the distributor cap, but mine seems to not be one of them I guess.

any advice would by much appreciated as I am about to take a hammer to the dash and buy an aftermarket mechanical unit.

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Unread 03-02-2013, 06:16 PM   #2
gbeltran
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The two prong sensor is something for the computer or the manifold heater, dont remember which, the oil gauge uses a 1 post sensor, it's pretty large compared to that two post deal, shaped like a bell. It's right below that one or just next to it, IIRC.
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Unread 03-02-2013, 06:21 PM   #3
rubinscube
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Quote:
Originally Posted by gbeltran View Post
The two prong sensor is something for the computer or the manifold heater, dont remember which, the oil gauge uses a 1 post sensor, it's pretty large compared to that two post deal, shaped like a bell. It's right below that one or just next to it, IIRC.
great. I am getting a flashlight and going outside to check right now
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Unread 03-02-2013, 06:27 PM   #4
laybackman
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Quote:
Originally Posted by rubinscube View Post
1988 yj with 4.2
gauge pegs at 80 psi when I started vehicle.

I changed the only sensor I could find on the passenger side/ lower engine / 2 prongs with no success, and I am unable to find the short.

many posts have another sending unit by the distributor cap, but mine seems to not be one of them I guess.

any advice would by much appreciated as I am about to take a hammer to the dash and buy an aftermarket mechanical unit.
Here is what you need:

http://www.gbaparts.net/electrical/o...-53005218.html
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Unread 03-02-2013, 06:35 PM   #5
rubinscube
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I uploaded a pic of the sensor I replaced. I did not see another
2013-03-02-18.27.20.jpg  
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Unread 03-02-2013, 06:37 PM   #6
rubinscube
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Originally Posted by laybackman View Post
I think I am missing something. I just bought this "nutter-fide" jeep. maybe they went too far in removing parts?
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Unread 03-02-2013, 06:44 PM   #7
gbeltran
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I think so, well don't know if they went to far as opposed to removing the wrong part. No, you are not missing anything where your arrow is, where the other sensor is now there is supposed to be a T fitting that the computer sensor and the oil pressure sensor screw into. You need to find the wire that goes to the gauge that's dangling around somewhere in the mess of wires (a wiring diagram would help ) and replace the two prong thing you have with the proper sending unit, which is in the link that laybackman posted, and just connect the proper wire to it.
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Unread 03-02-2013, 06:47 PM   #8
laybackman
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I think that is your knock sensor. look at the area just above your oil filter
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Getting older, I have developed some special skills. I have the ability to cough, sneeze, fart and pee at the same time.

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David C. Wilker Jr. USAF (RET)
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Unread 03-02-2013, 06:56 PM   #9
rubinscube
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Quote:
Originally Posted by gbeltran View Post
I think so, well don't know if they went to far as opposed to removing the wrong part. No, you are not missing anything where your arrow is, where the other sensor is now there is supposed to be a T fitting that the computer sensor and the oil pressure sensor screw into. You need to find the wire that goes to the gauge that's dangling around somewhere in the mess of wires (a wiring diagram would help ) and replace the two prong thing you have with the proper sending unit, which is in the link that laybackman posted, and just connect the proper wire to it.
ok. I found this thread with a picture that has a "T" you spoke of, & I do have an electric choke. if this is an example of what it should look like, I think you have solved it; and it looks like I need that darn "T" part.

http://www.jeepforum.com/forum/f57/h...-lost-1302883/
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Unread 03-02-2013, 07:01 PM   #10
gbeltran
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Quote:
Originally Posted by laybackman View Post
I think that is your knock sensor. look at the area just above your oil filter
The knock sensor on the 4.2 is located on the intake, just in front of the carb.
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Unread 03-02-2013, 07:09 PM   #11
rubinscube
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is this the wire? it was right next to the other plug and has only 1 spade connection.
2013-03-02-19.02.23.jpg  
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Unread 03-02-2013, 07:13 PM   #12
laybackman
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Quote:
Originally Posted by gbeltran View Post
The knock sensor on the 4.2 is located on the intake, just in front of the carb.
Is it? Jeep had to do it differently didn't they Most older engines has them in the lower block. If they were too 'sensitive' you added more teflon tape to the threads so it would not 'hear' as well....

I stand corrected!
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Chicks dig me.....Fish fear me

Getting older, I have developed some special skills. I have the ability to cough, sneeze, fart and pee at the same time.

"If we cannot afford to take care of Veterans, then we should stop making them."
David C. Wilker Jr. USAF (RET)
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Unread 03-02-2013, 07:16 PM   #13
rubinscube
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Quote:
Originally Posted by laybackman View Post
Is it? Jeep had to do it differently didn't they Most older engines has them in the lower block. If they were too 'sensitive' you added more teflon tape to the threads so it would not 'hear' as well....

I stand corrected!
LOL the old timer at our jeep dealership here in Colorado said:

"jeeps were put together with what they had on hand at the time it was made".
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Unread 03-02-2013, 07:26 PM   #14
laybackman
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Quote:
Originally Posted by rubinscube View Post
is this the wire? it was right next to the other plug and has only 1 spade connection.
That is it1 read the link provded earlier Ir aow howw theb'plumbing is in tthe shape of a T to hook up both sending units
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Chicks dig me.....Fish fear me

Getting older, I have developed some special skills. I have the ability to cough, sneeze, fart and pee at the same time.

"If we cannot afford to take care of Veterans, then we should stop making them."
David C. Wilker Jr. USAF (RET)
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Unread 03-02-2013, 07:29 PM   #15
laybackman
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http://www.jeepforum.com/forum/f57/h...-lost-1302883/

post #6
__________________
Chicks dig me.....Fish fear me

Getting older, I have developed some special skills. I have the ability to cough, sneeze, fart and pee at the same time.

"If we cannot afford to take care of Veterans, then we should stop making them."
David C. Wilker Jr. USAF (RET)
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