Hello fellow Jeepers! So my problem has my head scratching a little bit. I have searched the forums a little bit but to be fair I haven't found a situation exactly like mine. So I have high oil pressure in my jeep Yj 2.5l. Yesterday I was driving on the interstate and my oil pressure bottomed out on the gauge with no other symptoms so I replaced the sending unit and all was good again. Well I went to start my jeep today and the gauge is reading around 60 for most of the drive. This continues until it warms up AND I park it on any kind of incline (on a hill where front end faces up or on the side of road where drivers side is higher than passengers side). When this happens the gauge drops back to the normal level of 40 psi. What is going on and why is this happening??
Thank you all in advance!
That's what I thought but the thing is that it won't drop to 40 when it is warm unless I stop on an incline. If I'm just driving it'll stay at 60 give or take a little depending on the rpms. This is normal?
About 2 weeks ago I had an oil pressure problem. After an oil change at the local garage I noticed an oil leak on the garage floor. I thought it was the adapter for the oil filter housing again. I've had to replace that sending unit a couple of times in the last year along with the gasket kit.That's a known problem with 4.0 as well as some others.When I looked closer at the area with engine running I noticed that the filter had mushroomed.I never saw that with any of my cars in 50+ years of driving. It turned out it was the oil pump pressure release valve. That meant dropping the pan to replace the pump.That took care of my problem. I don't know if your prob. is related at all but would be something to look into. The thing is though,my gauge never pegged that I know of. Hope this helps you.
Another thing you could do is bypass the dash gauge by removing the sending unit then put a test gauge in there to verify if it's electrical or mechanical.
Not sure if this is the cause or not, but sometimes the oil galley to the sender gets gunked up with sludge and crap which leads to inaccurate oil pressure readings.
I haven't had a chance to check with a manual gauge but when I take the sender out I'll look a little closer at the little hole to see if I can tell if there's gunk in there
That's what I thought but the thing is that it won't drop to 40 when it is warm unless I stop on an incline. If I'm just driving it'll stay at 60 give or take a little depending on the rpms. This is normal?
It's different on an incline? hmm.... do the mechanical gauge test. Does the gauge ever bounce around randomly?
Just a question about what you said. The incline you typically stop at. Is your wheel turned to the left or right as if you are about to make a left/right turn?
Also, can you check if you hold your brake pedal in, does the rpm go up?
Hey everyone! I apologize for the super late reply. To answer the questions, the oil was topped off and there was no particular turning of the wheel.
To update this I did end up using a manual gauge and it was in fact high. I replaced the oil pump, filter, oil and cleaned up everything during the oil pump change. When it was all said and done the oil pressure is still high. I'm lost as to what to do now. The pressure release valve is replaced and all. Should I use marvels mystery oil and see if that helps?
So does parking on an incline correct it still?:shhh: When using the test gauge did the pressure eventually drop to normal range? What weight oil are you using?
Now that I changed the oil pump parking on an incline does not correct the pressure and I was running 5w30 for winter months and when I changed it I put 10w30 for the warmer months ahead
Honestly, it only worries me because I'm about to go into PA school soon and I won't be able to work at all, so if the engine gets messed up and I have to fork out big bucks I won't be able to afford it. I have had this jeep for a few years now and taken good care of it with regular maintenance, so I guess there is sentimental value in it and I don't want the engine damaged. I wanted to keep it all the way through PA school so that I could put the money I want to in it.
Honestly, with oil pressure, there isn't much you can do other than make sure the PCV is working properly and that you have been changing the oil regularly. If pressure is too low, you can change the pump, but those rarely fail on these jeeps.
Going into the engine chasing high oil pressure problems is going to be almost as expensive as just getting a new crate 4.0. you'd be talking about 'rebuild while you're in there'. Just save for a new 4.0, and enjoy the jeep. If the engine blows, order the new engine.
Ok sounds good I'll just save for the engine swap and do it when it blows since I'm assuming could happen soon or long down the road? Lol! Thank you everyone for the responses!
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