Oil pump going out possibly?
Thread Starter
Seasoned Member
Joined: Dec 2009
Posts: 326
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Year: 1994
Model: Cherokee
Engine: Inline 6 4.0 H.O. Police Package
I ha e a kind of odd problem going on at start my oil pressure is reading at 40 at idle and 60 with throttle the weird part is when the engines hot at 210 for about 10 minutes while driving the temperature starts creeping up to 220 ish and oil pressure goes down to 20 at idle and 40 with throttle and I hear a lifter start ticking ONLY when hot it's never done it whole cold or before it starts getting hot alot of people told me to switch to Rotella t6 5w 40 and call it good but I'm looking for other opinions on maybe something else going on?
I ha e a kind of odd problem going on at start my oil pressure is reading at 40 at idle and 60 with throttle the weird part is when the engines hot at 210 for about 10 minutes while driving the temperature starts creeping up to 220 ish and oil pressure goes down to 20 at idle and 40 with throttle and I hear a lifter start ticking ONLY when hot it's never done it whole cold or before it starts getting hot alot of people told me to switch to Rotella t6 5w 40 and call it good but I'm looking for other opinions on maybe something else going on?

20 hot idle? you are good man...
And yes when the oil gets hot and thin it will tick.
CF Veteran


Joined: Nov 2017
Posts: 2,478
Likes: 275
From: Southern Texas (former AZ & Aus)
Year: 1999
Model: Cherokee(XJ)
Engine: I6 4.0L
Agreed with Bugout... that's what it sounds like to me too.
and also, they all normally run a bit different for pressure it seems.
At idle when up to temp on mine, she'll sit at about 40-45psi... then with throttle on rollin' down the road she sits at about 55-60ish.
But my cooling system is currently working as it should and usually sits at 208-210 on a really warm day. I've never seen mine go above 212 so far.
and also, they all normally run a bit different for pressure it seems.
At idle when up to temp on mine, she'll sit at about 40-45psi... then with throttle on rollin' down the road she sits at about 55-60ish.
But my cooling system is currently working as it should and usually sits at 208-210 on a really warm day. I've never seen mine go above 212 so far.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
How long since the last oil change?
What oil was used and which brand filter.
I agree with the other Arizona boys. You have a cooling system issue.
What oil was used and which brand filter.
I agree with the other Arizona boys. You have a cooling system issue.
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Thread Starter
Seasoned Member
Joined: Dec 2009
Posts: 326
Likes: 0
Year: 1994
Model: Cherokee
Engine: Inline 6 4.0 H.O. Police Package
Last oil change about 1000 miles ago if that ran 10w 30 vr1 valvoline in it with a wix filter as always now that this whole problems shown up I'm going to change it again here soon and put Rotella t6 5w 40 in it with a wix filter what could be the overheating though I mean I've about done everything to this thing the only thing I can think of as an emergency fix driving from Arizona to Michigan I had to change my fan clutch out with a junkyard one ? Everything else has always been bought at O'Reilly auto parts brand new thermostat water pump I haven't changed Radiator? I just recently put a new cap on both the Radiator and overflow about a week ago?
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