Low oil pressure. One repair after another...

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Mar 12, 2013 | 08:25 PM

#16

mudnmore

Thread Starter

Newbie

Joined: Feb 2011

Posts: 5

Likes: 0

Year: 2000

Model: Cherokee

Yet another update.

So I have done alot of research. After searching I might have a heat soak issue. Although I really am not positive. With that im not sure what I should do from here. I got rotella t5 10w30 sythetic blend with a mopar filter and want to see if that helps my pressure problem but doubt it will help with the idle. It only idles rough after engine has warmed up, I turn it off, and start it again after a few minutes. I really just dont know.

Mar 12, 2013 | 09:59 PM

#17

jebmccall

Senior Member

Joined: May 2011

Posts: 749

Likes: 1

Year: 1997

Model: Cherokee

Engine: 4.0

was the oil pressure different on the mechanical gauge that what is showing in the dash????????????????????

Mar 12, 2013 | 10:59 PM

#18

mudnmore

Thread Starter

Newbie

Joined: Feb 2011

Posts: 5

Likes: 0

Year: 2000

Model: Cherokee

No the pressure was not different. Maybe slightly but overall no.

Mar 13, 2013 | 04:35 AM

#19

Lw2044

Junior Member

Joined: Sep 2012

Posts: 45

Likes: 0

X2 heat soak

Mar 13, 2013 | 07:01 AM

#20

bigbadon

Senior Member

Joined: Jan 2012

Posts: 952

Likes: 4

Year: 2004

Model: Grand Cherokee

Engine: 2000 4.0

Quote:

Originally Posted by mudnmore

UPDATE

I used a mechanical gauge yesterday and numbers were accurate and where they should be. Also coolant leak magically stopped. Havent lost any coolant from the reserve tank either. Only problem is my idleing stills seems slightly rough to me and my gauge still reads about 20-25 psi when engine has been and is hot at idle. It is starting to warm up and turn into spring weather so I think I will do an oil change using 10w30. The jeep has 126,000 miles but the engine only has about 65 or 70 thousand roughly. I was considering switching to synthetic. Is this a good idea?

A rough idle will cause a lower oil pressure reading. Do not get focused on the oil pressure...too many variables. Synthetic will usually show a lower pressure but that is a good thing. I have said it a thousand times, "oil pressure readings are a result,not a cause".

Mar 13, 2013 | 08:15 AM

#21

Muaddib420

Seasoned Member

Joined: Jun 2012

Posts: 485

Likes: 3

Model: Cherokee

Changing oil viscosities will not help with the idle issue. Causes of rough idle are varied and could include one or more of these. Bad Or dirty IAC. Vacuum leak in intake manifold. Bad O2 sensors. Clogged or faulty fuel injectors. Faulty coil. Misfiring and faulty spark plugs.

I would start with the cheapest and simplest and go from there. Get a bottle of throttle body cleaner and go to work on your throttle body and IAC. Plenty of write ups online about this.

Make sure all gaskets and sensors are seated tightly around your throttle body. Check your air filter and change it if needed.

Most importantly keep an eye out on your coolant and take it back to the shop that did all the coolant work if you're leaking coolant.