Question about 1996 Jeep Grand Cherokee

2 Answers

Oil pressure is about 40 when engine is cold. When warm and on the road pressure drops to about 20-25. When stopped (stop sign) and RPM drop to about 600 warning comes on and pressure is about 5-10. What is the difficulty?

Posted by on

Ad

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Guru:

    An expert who has written 7 tips or uploaded 3 video tips

  • Master
  • 630 Answers

A few things come to mind lets start with the easiest first and that would be a bad oil filter along with old thinned out motor oil, change the oil and filter and see what happens on your pressure gauge.
Secondly it could be the strt of a bad oil pump...wear between the impeller gears and the pump housing, this coukld be a bit of an expense as the oil pan would have to be removed to obtain access to the pump, once you have that pan down check the oil pick up strainer, if the oil has been neglegted it may be impacted with sludge, clean out, pull the oil pump apart and have an engine rebuilder tech check the pump for wear and scores in the pump housing gears and bore walls, if scored replace the pump.
Do not....I repeat....Do not flush your engine out with any of those engine flushes you can buy in the parts store, high mileage vehicles can only be cleaned statically and the best way is to rebuild the engine or replace it with a newer lower mileage unit if it is really plugged up, knocking and clunking.
Which brings me to a different state of mind on this matter of engine flushing....ok here it is....if you already know that the engine is going to get replaced due to excessive sludge build up from poor oil change etc. maitanence, then and only then would I try a quart can of engine flush....use as directed...what is the worse that can happen the motor wipes out??? Well we just agreed it was going to be replaced anyhow...how about the positiv point...it corrects the problems by freeing up all the oil lubrication passages throughout the interior of the engine, if that is the case and the flush fixes it, I would add new oil new filter and a can of dura lube to the engine to try and enhance the lubrication cycle.
Hope this all helps.
Happy Motoring!!

Posted on Jul 15, 2010

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Jeep Master
  • 22,156 Answers

Most likely cause is a worn oil pump and worn main bearings ,try a new oil filter and oil then put a can or two of STP or wyns oil treatment in and sell it quick

Posted on Jul 15, 2010

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

What should the cold start oil psi and the 190 degree warm up oil psi be on a 2000 to 2002 gmc Yukon with a 5.3 eng


Different engines can show different values. Sometimes it is the sensor itself that causes the variation. The pressures that you are witnessing are well within operation norms and are nothing to be worried about. As long as you don't experience severe drops in oil pressure during acceleration and deceleration, then the oil pressure system is working well.

Mar 03, 2015 | GMC Cars & Trucks

1 Answer

What should be oil pressure on 1999 Pontiac Bonneville?


I would not worry about the pressure you are seeing.
Cold oil will have a higher pressure and drop as it get warm. Also newer cars run lighter weight oil in an effort to get better gas mileage. You can run heavier weight oil if the lower pressure bothers you and as the mileage goes up on a car things wear and the pressure will drop.

Oct 06, 2014 | 1999 Pontiac Bonneville

1 Answer

1999 Z-71 with high mileage (224,000) I lose oil pressure as the engine warms up. Cold start I run 40-50 PSI but after it warms up it drops to around 20-25 as long as your foot is in the pedal. When I...


I dont want to be the one to bring you bad news, but you most likly have engine wear. Bearing clearances, oil pump clearances all are getting out or tollarences. you can improve this by using 15/40 mptor oil , or heaver, but that is a patch. for a long shot change the oil presure sending unit or better yet use a mechanical gauge to verify the true pressure

Jun 11, 2011 | 1999 Chevrolet Silverado 1500

1 Answer

Alrighty. I've asked this a few times before, I have more info now. CHEVY 350 K1500. 1993. Replaced intake gaskets, (bad oil leak) dropped a small amount of coolant in with oil while doing so. Changed oil...


how did you clean the gasket off of the head? if you used a sanding disc the grit will eat up the bearings. are you reading pressure with a mechanical gauge? you have replaced all bearings??

6 psi @ 1000 RPM
18 psi @ 2000 RPM
24 psi @ 4000 RPM
this is chevrolet specs on oil pressure in your truck so you are within the range.

describe your idle problem more and i will try and help you with that

Feb 02, 2011 | 1993 Chevrolet K1500

2 Answers

When car is cold oil pressuer is at 75 lbs when car is warmed uped it drops to 40 lbs (v6 3800) when warmed uped and give it gas it goes up to 60 lbs but when i stop it dropes to 45 lbs why is this please...


When the oil is cold it is thinner or watery and the pump moves more oil as it turns making the pressure go up. As the oil warms up it thickens and the pump moves less oil letting the pressure go down. Increasing the engine speed makes the pump turn faster, therefore it moves more oil and the pressure goes up. Changing oil grades will change the numbers somewhat, for example 10W40 will give you different readings than 5W30. I don't see any problem with the readings you put in your posting. I wouldn't be concerned until the warm idle pressure gets down to about 30 or a little lower. Hope this helps.

Oct 27, 2009 | 2001 Chevrolet Camaro

3 Answers

I have oil pressure until i stop , then it drops to below 10 psi


Increase the viscocity of your oil. If you're using 10W30, go to 10W40. If you're using 10W40 switch to 20W50. Don't use single weight oil.

Sep 19, 2009 | 1998 Jeep Wrangler

1 Answer

2002 jeep wrangler oil pressure gauge drops


When the gauge is at 0, is there any noise from the engine (tick, knock etc?) I would have someone put a mechanical gauge on there and read true pressure.Your driving pressure seems OK but if the low number is "real" something is wrong!

May 30, 2009 | 2002 Jeep Wrangler

1 Answer

Low oil pressure at idle


how low does the oil pressure drop?? is it below 40?

Mar 05, 2009 | 1990 Ford F150

1 Answer

Oil Pressure Drops While Driving


your oil pump is either weak or there is sludge i9n the oil pan. my adives is to have the oil pan dropped . chances are sludge is the culprit. as the oil get's warm the pressure should only drop slightly but pressure is generally dictated by engine rpm. pumps are gear driven so if it was a bad pump your oil pressure would start out very low at start up.

Aug 28, 2008 | 1995 Jeep Grand Cherokee

Not finding what you are looking for?
1996 Jeep Grand Cherokee Logo

108 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jeep Experts

yadayada
yadayada

Level 3 Expert

76164 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Kevin Daniels

Level 3 Expert

1455 Answers

Are you a Jeep Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...