Oil Sending unit location - JeepForum.com

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post #1 of 19 Old 02-15-2010, 06:24 PM Thread Starter
shansel88
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Oil Sending unit location

I know this may be crazy, but I cant seem to find the oil pressure sending unit on my 1990 wrangler. I believe I may have located it on the passenger side of the motor, between the oil filter and the firewall? If so does is have two connectors on it and a black snapped cover around it?? If this is it what is throwing me off is the one I just purchased only has one connector???? Are they interchangable??? Two connectors vs. one??
Thanks again for the help!

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post #2 of 19 Old 02-15-2010, 06:31 PM
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post #3 of 19 Old 02-15-2010, 06:35 PM Thread Starter
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Sorry, it is the six cylinder motor. 4.2 I believe.
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post #4 of 19 Old 02-15-2010, 06:35 PM
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Here is the oil pressure sending unit on my '91 YJ, it should be the same for yours.


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post #5 of 19 Old 02-15-2010, 06:45 PM Thread Starter
shansel88
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Thanks for photo, but they must have changed in 1991. Mine is not in that location. Anyone have any more info??? for maybe 89-90??
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post #6 of 19 Old 02-15-2010, 07:24 PM
jaminb
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it should be right behind the oil dipstick. towards the firewall. It will have an elbow connector and to sensors. One is for a light on the dash and the other that looks like cylinder is the sending unit for the oil pressure gauge.
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post #7 of 19 Old 02-15-2010, 07:35 PM
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Max's picture above is for the 1991 & up 4.0's.
The 4.2's were different. They have 2 pressure sensing units.
Your setup should look like this...
#1 Is the pressure sensor for your dash oil pressure gauge
#2 Is the pressure switch for the electric choke

The two are not interchangeable.
#1 provides a variable resistance proportional to the oil pressure
#2 is and ON/OFF switch controlled by the presence or absence of oil pressure
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post #8 of 19 Old 02-15-2010, 07:44 PM
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Quote:
Originally Posted by kloppk View Post
Max's picture above is for the 1991 & up 4.0's.
The 4.2's were different. They have 2 pressure sensing units.
Your setup should look like this...
#1 Is the pressure sensor for your dash oil pressure gauge
#2 Is the pressure switch for the electric choke

The two are not interchangeable.
#1 provides a variable resistance proportional to the oil pressure
#2 is and ON/OFF switch controlled by the presence or absence of oil pressure

He be right:
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post #9 of 19 Old 02-16-2010, 06:11 PM Thread Starter
shansel88
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Thanks for the pic. Changed it out and fixed the issue. Thats one more problem down only a few more to go!
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post #10 of 19 Old 11-06-2016, 08:29 PM
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Quote:
Originally Posted by shansel88 View Post
I know this may be crazy, but I cant seem to find the oil pressure sending unit on my 1990 wrangler. I believe I may have located it on the passenger side of the motor, between the oil filter and the firewall? If so does is have two connectors on it and a black snapped cover around it?? If this is it what is throwing me off is the one I just purchased only has one connector???? Are they interchangable??? Two connectors vs. one??
Thanks again for the help!

Hey I was just wondering what kind of symptoms you were having as i'm trying to determine if I need a new unit. My oil pressure gauge is maxed out 24/7 even in the accessory position (key barrel). Im thinking its just grounded out somewhere but if yours was also maxed out then maybe it could be the sending unit. I have a 1989 Yj 4.2L im not sure if everything is the same but i guess i will find out. Any help would be greatly appreciated.

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post #11 of 19 Old 11-07-2016, 08:04 AM
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Hey Smokey. Welcome to the forum. This is a really old thread an many of the peeps on threads this old are probably not around anymore. You are better off posting a new thread unless its recent. The easy check on the pressure is to ground the single wire going to it to chassis/engine and look at the gauge. It should go to 0. If it does then you have a bad pressure sensor.

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post #12 of 19 Old 11-07-2016, 10:27 AM
smokeyjason
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Thanks Que89yj and do you mean if it does not go to 0 then i need a new pressure sending unit?

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post #13 of 19 Old 11-07-2016, 10:49 AM
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It should deflect to zero. If it does then replace the sensor. Post back what happens.

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post #14 of 19 Old 11-07-2016, 11:03 AM
smokeyjason
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will do thanks for the help, i will check after work.

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post #15 of 19 Old 11-09-2016, 09:56 PM
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Quote:
Originally Posted by Que89YJ View Post
It should deflect to zero. If it does then replace the sensor. Post back what happens.
Hey just replying to let you know how things went. You said if i ground out the connector it should go to 0, so i thought if i just remove the connector from the OPSU it should just stay pegged to the max (since i knew the gauge wasn't seized). Shure enough it stayed pegged so i bought a new OPSU and boom were back in business. She reads 3-4 when i started it, i think the units used to measure the OP is kg/cm2 but i could be wrong. Anyways thanks for the help!

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