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Low oil pressure at idle

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Old 11-24-2015, 08:46 PM
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Flush the coolant, get to replacing parts!!
Old 11-24-2015, 09:42 PM
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Originally Posted by kgm
Flush the coolant, get to replacing parts!!
Maybe the quick lube place already did work on it. OP, have you done any work to you cooling system lately
Old 11-24-2015, 10:04 PM
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The 96 I just put a new head on and did a oil change with Valvoline high mileage 10w-30 and a Mobile PureOne filter idles a bit over 20 when warm, normal driving it's around 40 psi.

I will say, the factory temp gauge/sender is not accurate, so OPs temp may be fine. I found the best way to double check that is to hook up to the OBD port with a OBDII scanner and verify what the thermostat housing temp sender says. Mine will say 195-197 while the gauge on the dash is over 210. I just decided if it's in the red, something is wrong, lol. Far as i'm concerned it's just a dummy gauge and not much use as a real gauge.
Old 11-25-2015, 05:13 AM
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Originally Posted by Destructo09
The 96 I just put a new head on and did a oil change with Valvoline high mileage 10w-30 and a Mobile PureOne filter idles a bit over 20 when warm, normal driving it's around 40 psi.

I will say, the factory temp gauge/sender is not accurate, so OPs temp may be fine. I found the best way to double check that is to hook up to the OBD port with a OBDII scanner and verify what the thermostat housing temp sender says. Mine will say 195-197 while the gauge on the dash is over 210. I just decided if it's in the red, something is wrong, lol. Far as i'm concerned it's just a dummy gauge and not much use as a real gauge.
I agree factory gauges aren't always correct, but saying that because yours is 197 and 210 via. Doesn't mean his over 210 may be ok. OP needs to get back on here and let us know about his cooling system history. At a certain point, the aux fan should kick on. That gauge doesn't look like its kicking on.
Old 11-25-2015, 05:20 AM
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Sorry I didn't see the notification. But I never did anything with the cooling. Only thing I did was an oil change. I belive the previous owner did have it done but hey it wouldn't hurt. Yea it has been running a little hot but then it goes back down. I've never seen it go much farther than that. I will keep an eye on it though.

Like I said I don't know much about jeeps and what to look for. I do have a blutooth obd2 scanner I'll hookup and take a look at the Temps and I'll get back to you.



This is from the 24th.
Old 11-25-2015, 06:22 AM
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ok i hooked it up to my scan gauge after work and this is what i came up with

Both picks were taken around the same time.
EDIT>>>>>*{just realized it was in celcius......}* so maybe i do have a problem...
114 Degrees Celsius = 237.2 Degrees Fahrenheit so yea im thinking thats not very good at all






i do think i have an issue though, not associated with these.....my heat isnt very hot at all.....

Last edited by Umb-694; 11-25-2015 at 06:26 AM.
Old 11-25-2015, 06:58 AM
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Originally Posted by Umb-694
ok i hooked it up to my scan gauge after work and this is what i came up with

Both picks were taken around the same time.
EDIT>>>>>*{just realized it was in celcius......}* so maybe i do have a problem...
114 Degrees Celsius = 237.2 Degrees Fahrenheit so yea im thinking thats not very good at all






i do think i have an issue though, not associated with these.....my heat isnt very hot at all.....
Ok. Were here to help you out. You gonna learn about your jeep because that ISNT good at all. When you drive, does the temp drop to nominal 210ish. Does it only go to 230 at idle. The more info you give us the better we can help. Lack of heat could be a clogged heat core. A good flush also helps.
Old 11-25-2015, 07:17 AM
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Originally Posted by sycoglitch
Ok. Were here to help you out. You gonna learn about your jeep because that ISNT good at all. When you drive, does the temp drop to nominal 210ish. Does it only go to 230 at idle. The more info you give us the better we can help. Lack of heat could be a clogged heat core. A good flush also helps.
yea when i drive it goes to 210, sometimes it will rise just above the line but not that far off, then it will go down (i guess when the fan engagges). it was fine then after my oil change it started climbing. i do know the fan doesnt have shroud on it.
Old 11-25-2015, 07:20 AM
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Originally Posted by Umb-694
yea when i drive it goes to 210, sometimes it will rise just above the line but not that far off, then it will go down (i guess when the fan engagges). it was fine then after my oil change it started climbing. i do know the fan doesnt have shroud on it.
That's issue number one. The XJ NEEDS a shroud. If you have a jy around your way, you should pick one up. There's going to be others chiming in as the day does on for other stuff you'll need to do so check in from time to time.

Do you have a spot where you can try to wrench on your jeep? If so, we can guide you as to what to fix and look for.
Old 11-25-2015, 07:24 AM
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Originally Posted by sycoglitch
That's issue number one. The XJ NEEDS a shroud. If you have a jy around your way, you should pick one up. There's going to be others chiming in as the day does on for other stuff you'll need to do so check in from time to time.

Do you have a spot where you can try to wrench on your jeep? If so, we can guide you as to what to fix and look for.
im actually going to head up to the local Pull a part by me they have 5 xjs on the lot, i already need to pick up a couple things.

i have a garage ill just park the dart in the spare bay for now, where i can wrench on it. i have basic tools and basic knowledge. i do have a roommate that i could always have help me.
Old 11-25-2015, 07:40 AM
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Originally Posted by Umb-694
im actually going to head up to the local Pull a part by me they have 5 xjs on the lot, i already need to pick up a couple things.

i have a garage ill just park the dart in the spare bay for now, where i can wrench on it. i have basic tools and basic knowledge. i do have a roommate that i could always have help me.
So there's your assignment. He area prepped so you can wrench on your jeep. Were always here to assist. As long as people are willing to learn and can handle some criticism, we got you. And if possible, for now on do your own oil changes. I've learned long time ago, those places screw you over. Put inferior filters and oil, etc. I'm not just being paranoid. Due to the orientation of the oil filter, you want one with a good anti-drain valve, like Napa gold. Plus the jeep gets 6qts. I've been to places, years upon years ago before I wrenched on my jeep, that didn't put enough oil. Also, I would pay for synthetic and I was able to tell by the look and texture that the oil was def some mass drum oil.
Old 11-25-2015, 07:44 AM
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Originally Posted by sycoglitch
So there's your assignment. He area prepped so you can wrench on your jeep. Were always here to assist. As long as people are willing to learn and can handle some criticism, we got you. And if possible, for now on do your own oil changes. I've learned long time ago, those places screw you over. Put inferior filters and oil, etc. I'm not just being paranoid. Due to the orientation of the oil filter, you want one with a good anti-drain valve, like Napa gold. Plus the jeep gets 6qts. I've been to places, years upon years ago before I wrenched on my jeep, that didn't put enough oil. Also, I would pay for synthetic and I was able to tell by the look and texture that the oil was def some mass drum oil.
I plan on doing my own changes. thats for sure. it will be alittle easier having a jeep than trying to crawl under my dart LOL. It is leaking oil pretty bad though so im sure thats an issue too. I only paid 1500 for it so i cant cry too bad. They did put 6 in it though or so they said ont he invoice.

Im glad i foudn this page. cause i dont know anyone that i can talk to other than like 2 people who also have xjs *facebook groups dont help either*. ill listen, and do what you guys tell me, figured sinc ei know nothing
Old 11-25-2015, 07:58 AM
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Yeah even just back flushing your heater core, then putting in a fan shroud will help a ton. Each part I replaced ended up helping the engine stay cooler in more uses, ie idling, climbing hills, etc.
Old 11-25-2015, 07:58 AM
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Originally Posted by Umb-694
I plan on doing my own changes. thats for sure. it will be alittle easier having a jeep than trying to crawl under my dart LOL. It is leaking oil pretty bad though so im sure thats an issue too. I only paid 1500 for it so i cant cry too bad. They did put 6 in it though or so they said ont he invoice.

Im glad i foudn this page. cause i dont know anyone that i can talk to other than like 2 people who also have xjs *facebook groups dont help either*. ill listen, and do what you guys tell me, figured sinc ei know nothing
Here's how to find your oil leak:




I'd be looking up ABOVE first, and VERIFYING the source of the oil leak YOURSELF.

Everybody, who doesn't own or have to pay for or perform your vehicle repairs, loves to poke their noggin UNDER the Jeep and come out bearing the false bad news that your RMS is leaking.

Many mechanics, friends, people on Jeep forums who can’t see your Jeep from where they’re at, and good old Uncle Bob seem to enjoy telling you it’s the rear main seal. Has a catastrophic ring to it, doesn’t it?

A simple leak at the back of the valve cover or other source could produce the same symptoms. You don’t need to be a mechanic to figure this out. If you have good eyesight and a dim flashlight, you’re good to go on your own. Don't jump on the RMS/oil pan gasket bandwagon right off the bat.

Almost any oil leak on your 4.0 is gonna drip from the RMS area for two simple reasons.

First off, the engine sits nose-up and any oil will run back to the RMS area. Secondly, the RMS area is also the lowest point on the engine. Simple physics and the old plumber's adage apply here. "$hit flows downhill".

Valve cover gasket, oil pressure sending unit, oil filter adapter seals and distributor gasket, in that order, have to be eliminated as possibilities first.

Revised 02-26-2013
Old 11-25-2015, 08:46 AM
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If there's no fan shroud, you need one, also check the fan clutch, there's a good chance it's never been replaced and if will get hot sitting still if it's bad.

The one on my 96 was original with 161k miles and it didn't do a thing at idle.

Once you've been driving it around for awhile and it's hot, cut the engine off and pop the hood. Try and turn the mechanical fan by hand, if it offers no resistance then the clutch is bad. They're pretty cheap and easy to replace, good time will be when you put the shroud in.


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