Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WJ > Troubleshooting/Problems

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 06-20-2012, 01:24 PM
Member
My Jeep: 2000 4.7L WJ
 
Join Date: Mar 2012
Location: Tyler, Tx
Posts: 31
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 902
wjross is on a distinguished road
help! Intermittent 4.7 oil pressure/coolant issues

Hey guys, i drive a 2000 WJ 4.7 (non HO) with about 170k miles. lately i've had a strange issue that i'm unsure how to pin point. The oil pressure has read very high, in the 65-70 range, where it is typically in the 45-50. this seemed to be resolved when i checked my oil level and found it low nearly a quart (oops). This morning the overhead unit displayed a message that my coolant is low, and my oil pressure gauge was reading in the 75-80 mark. This was on my way to the office and engine temp was at normal. after pulling over, checking oil and restarting i have seen nothing of either issue reappear. i might also mention that this is only a week after my ac compressor locked up, i don't know how or if it could be related but mentioning it won't help. I know some of this is vague, i will be happy to answer questions. Any thoughts or ideas are much appreciated!
__________________

__________________
Reply With Quote
  #2  
Old 06-20-2012, 06:28 PM
hoffmanestates's Avatar
Member
 
Join Date: Nov 2011
Posts: 962
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 2285
hoffmanestates has a reputation beyond reputehoffmanestates has a reputation beyond reputehoffmanestates has a reputation beyond reputehoffmanestates has a reputation beyond reputehoffmanestates has a reputation beyond reputehoffmanestates has a reputation beyond reputehoffmanestates has a reputation beyond reputehoffmanestates has a reputation beyond reputehoffmanestates has a reputation beyond reputehoffmanestates has a reputation beyond reputehoffmanestates has a reputation beyond repute
oil pump possibly starting to go out is a hunch I have. don't quote me.just yet

Turbo charged G2X using tapatalk 2
__________________

__________________
Reply With Quote
  #3  
Old 06-22-2012, 08:52 AM
Member
My Jeep: 2000 4.7L WJ
 
Join Date: Mar 2012
Location: Tyler, Tx
Posts: 31
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 902
wjross is on a distinguished road
Re: help! Intermittent 4.7 oil pressure/coolant issues

There is also a sound associated with this problem, one that i don't recognize. The sound is something metal-on-metal friction, a kind of whir. This worries me for fear of damaging the motor, i would be more concerned with low oil pressure but it has never been low
__________________
Reply With Quote
  #4  
Old 06-22-2012, 11:20 AM
Frango100's Avatar
Premium Member

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 4,698
Thanks: 9
Thanked 57 Times in 55 Posts
Rep Power: 525513
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: help! Intermittent 4.7 oil pressure/coolant issues

The high oil pressure would be contrary to a low oil level. Being 1 Qt low should still not give any problems with low oil pressure also.
My guess is the oil pressure sensing unit.
When you had the low coolant level warning, how was the level visually on the overflow reservoir? The sensor can give sometimes wrong level indications after making a turn for example.
The metal noise you hear, is it there with the jeep standing still as well? You need to pinpoint the exact place where the noise is coming from. A mechanics stetoscope would be of a great help to do this.
That you mentioned the AC compressor locked up, did this do anything to the serpentine belt and/or tensioner? The tensioner pulley bearings tend to become dry over time and start making noises and can even become blocked in the worst case. You can easily remove the serpentine belt and spin these pulleys by hand to see if they make noise or have excessive play.
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
Monroe Reflex shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #5  
Old 06-22-2012, 01:52 PM
Member
My Jeep: 2000 4.7L WJ
 
Join Date: Mar 2012
Location: Tyler, Tx
Posts: 31
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 902
wjross is on a distinguished road
Re: help! Intermittent 4.7 oil pressure/coolant issues

Yes the coolant was low, i added fluid, so that was no biggie. i mentioned it in case that it could somehow have been related.

The noise is present with the vehicle still, in park or in drive, and persists at slow speeds, past so many RPM i can't hear it over my exhaust (glasspack) lol. but the pulley is a good idea, i had not thought to check it out.
__________________
Reply With Quote
  #6  
Old 06-22-2012, 01:54 PM
Member
My Jeep: 2000 4.7L WJ
 
Join Date: Mar 2012
Location: Tyler, Tx
Posts: 31
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 902
wjross is on a distinguished road
Re: help! Intermittent 4.7 oil pressure/coolant issues

and yes the low level, high pressure made absolutely no sense to me. this lends credit to your pressure sensing unit theory
__________________

__________________
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
04 4.7HO oil pressure switch, vs actual oil pressure Sqall12001 Grand Cherokee - WJ 2 05-21-2012 02:00 PM
Oil change and pressure check issues. Unholyskorn86 Troubleshooting/Problems 10 03-28-2012 03:01 PM
Coolant Issues Ypahihi Engine Performance/Intake/Exhaust 14 11-27-2011 01:10 AM
oil pressure issues with my 2000 chreokee 4.0 daleann1 Cherokee-SJ and XJ 8 02-11-2011 11:56 PM
Intermittent blower issues mjl2610 Troubleshooting/Problems 1 02-04-2010 03:18 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 09:00 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community