1998 Cherokee 4.0 l6, I changed the oil, now oil pressure gauge doesn't work? - JeepForum.com
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Unread 11-25-2008, 03:44 PM   #1
XJMuscle98
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1998 Cherokee 4.0 l6, I changed the oil, now oil pressure gauge doesn't work?

First off, oil change went fine.

When i first turned my 1998 Jeep Cherokee on, the oil pressure was about 10psi higher than usual.. didn't think much of it..

BUT I didn't know not to wrench tighten the oil filter so I loosened it and now oil pressure gauge doesn't move, and dashboard says check gauges...

Would I have knocked something out be the cause of the oil gauge not working?

I do not know what the previous oil was between 2006 and now (2006 was the last registered oil change, my dad had done it himself in between), so I used 5W-30 since it's the winter time. The previous sticker said 10W-30.

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Unread 11-25-2008, 03:49 PM   #2
balloo93
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MOre than likely you busted the Oil Pressure sensor that is attached to the filter adapter.

Very common occurance.
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Unread 11-25-2008, 03:52 PM   #3
XJMuscle98
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Quote:
Originally Posted by balloo93 View Post
MOre than likely you busted the Oil Pressure sensor that is attached to the filter adapter.

Very common occurance.
oh lord...Is this going to be hard to fix?

More importantly, do I honestly need my oil pressure gauge?
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Unread 11-25-2008, 04:12 PM   #4
UKJeepThang
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I wouldn't be without my oil pressure guage.

It must be easy to fix the sensor as it's easy to get to. Having said that, I've never needed to fix/replace mine.
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Unread 11-25-2008, 04:20 PM   #5
balloo93
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Extremely easy. You either knocked the plug loose or cracked/damaged the connector on the sensor. If that's the case, just unscrew the sensor and replace it. Make sure it's not leaking, and you can run it without the oil pressure gauge until you can replace the sensor if need be.
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Unread 11-25-2008, 04:21 PM   #6
tjwalker
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Here's why you should fix it if it is damaged. Check it to see if it is leaking oil; a lot of times they won't when bumped but are damaged enough so that your oil pressure signal is interrupted.

However, leaving a damaged oil pressure sending unit is NOT ADVISED as if it does develop a leak and it very well could, you could have a serious oil leak creating low enough oil level to seriously damage your engine. Most people don't want to take that chance for a cheap easy repair.

These sending units are really pretty inexpensive. I recommend buying it directly from Jeep for best mating accuracy with your gauge. Will take you about 15 minutes to replace. I honestly would not delay in performing this repair.
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Unread 11-25-2008, 04:25 PM   #7
XJMuscle98
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I'm a bit lost here, where exactly is this oil pressure sensor thing, and how do i check it to see if its broken or needs replacement?
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Unread 11-25-2008, 04:30 PM   #8
tjwalker
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It is located DIRECTLY above your oil filter. And being in that location, it is sometimes damaged in the process of removing and installing a new oil filter during an oil change. There is a connector with a couple of wires plugged into it. Inspect this part very closely.
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Unread 11-25-2008, 04:33 PM   #9
loosenut
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It's sticking out right above your oil filter. It has a wire connected to it, about the size of a spark plug. You probably had to work around it to change the filter, or you plowed right through it.
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Unread 11-25-2008, 04:33 PM   #10
XJMuscle98
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Quote:
Originally Posted by tjwalker View Post
It is located DIRECTLY above your oil filter. And being in that location, it is sometimes damaged in the process of removing and installing a new oil filter during an oil change. There is a connector with a couple of wires plugged into it. Inspect this part very closely.
I've gotcha, thanks everyone!

I'm hoping its just a matter of replugging a wire and being done with the issue.

Anyone have any comments on the oil pressure being up 10psi after a change?
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Unread 11-25-2008, 04:34 PM   #11
XJMuscle98
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Quote:
Originally Posted by loosenut View Post
It's sticking out right above your oil filter. It has a wire connected to it, about the size of a spark plug. You probably had to work around it to change the filter, or you plowed right through it.
LOL! That probably is what happened
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Unread 11-25-2008, 04:41 PM   #12
tjwalker
It's the crank sensor!
 
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If you knocked the connector off, lucky break; secure the connector and you should be good to go.

Per the factory service manual, the oil pressure for the 4.0 should be a minimum of 13 psi at HOT idle.
Above 1600 rpm, it should be somewhere between 37-75 psi.

Post your exact oil pressure numbers BEFORE AND AFTER the oil change for comment.
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Unread 11-25-2008, 04:51 PM   #13
loosenut
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Not sure why your oil pressure would be higher after switching to a lighter weight oil. I would think it would go down a bit with thinner oil, but im not positive.
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Unread 11-25-2008, 05:02 PM   #14
XJMuscle98
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Quote:
Originally Posted by tjwalker View Post
If you knocked the connector off, lucky break; secure the connector and you should be good to go.

Per the factory service manual, the oil pressure for the 4.0 should be a minimum of 13 psi at HOT idle.
Above 1600 rpm, it should be somewhere between 37-75 psi.

Post your exact oil pressure numbers BEFORE AND AFTER the oil change for comment.
before it was pretty much right at 40-43 ..after it's at about 50..both atthe middle of the temparature guage ((I forget what the number is)..possible new issue though, after about 90-105 minutes in 45 degree weather, the temperature is showing at the first notch (again I forget what the numbers are ) when usually it would be cooled down all the way
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Unread 11-25-2008, 05:20 PM   #15
tjwalker
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Don't be too concerned about those oil pressure numbers. Your main concern is that they are in the reasonable range and in spec and you are. Just keep an occasional eye on it......

As for your temperature issue, just like your oil pressure; the devil is in the details. Post exactly what you are seeing in as much detail as you can; I'm a bit confused by the description of the symptoms in your last post.
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