Oil psi from 40 to 0

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Jun 11, 2012 | 07:19 PM

#16

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

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From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by Xj1990

Not to proud of it since I've found recently that they are ****ty. Fram.

I'm gonna change it this week when I get paid

Note how much oil comes out when you remove the filter. I'm gonna say "not much".

Jun 11, 2012 | 07:32 PM

#17

Mctowelie

Junior Member

Joined: Oct 2010

Posts: 77

Likes: 0

From: Chester, Ma

Year: 1997

Model: Cherokee

Engine: 4.0

The fram could be the problem. Ive been using Mopar filters, MO90 they go buy, made by Champion. I get good psi at istart up. In the 40's, when i get at idle after shes warm, stops lights etc. she likes 20-30. The field service manuel says states

Quote:

''The factory service manual says oil pressre at idle speed = 13psi and at 1600rpm and higher = 37-75psi.''

. The fram id say will turn out to be your problem just my opionion. Im at 173,000+. (If anything was every wrong internally, Junkyard 4.0L heads and/or blocks are a dime a dozen in some states.